[{"data":1,"prerenderedAt":2427},["ShallowReactive",2],{"doc-\u002Fhow-to\u002Fhow-to-merge-two-lists-in-python":3},{"id":4,"title":5,"body":6,"description":2420,"extension":2421,"meta":2422,"navigation":113,"path":2423,"seo":2424,"stem":2425,"__hash__":2426},"content\u002Fhow-to\u002Fhow-to-merge-two-lists-in-python.md","How to Merge Two Lists in Python",{"type":7,"value":8,"toc":2378},"minimark",[9,13,17,20,33,38,149,152,187,193,197,208,215,218,232,235,366,368,448,456,465,474,483,491,496,507,509,597,599,648,652,662,667,677,684,687,690,712,720,722,805,807,839,842,942,944,976,980,983,998,1001,1022,1030,1034,1037,1044,1050,1124,1126,1162,1170,1177,1185,1258,1260,1292,1296,1446,1448,1503,1516,1520,1523,1532,1535,1600,1602,1629,1635,1700,1707,1710,1713,1782,1784,1794,1803,1806,1870,1874,1879,1881,1933,1940,1942,2005,2007,2032,2039,2046,2051,2110,2112,2129,2132,2195,2199,2202,2268,2271,2285,2289,2293,2299,2307,2317,2324,2329,2333,2342,2346,2374],[10,11,5],"h1",{"id":12},"how-to-merge-two-lists-in-python",[14,15,16],"p",{},"If you want to combine two Python lists into one list, there are a few simple ways to do it.",[14,18,19],{},"On this page, you will learn:",[21,22,23,27,30],"ul",{},[24,25,26],"li",{},"How to combine two lists into one list",[24,28,29],{},"When to create a new list and when to change an existing list",[24,31,32],{},"How to avoid common beginner mistakes when merging lists",[34,35,37],"h2",{"id":36},"quick-answer","Quick answer",[39,40,45],"pre",{"className":41,"code":42,"language":43,"meta":44,"style":44},"language-python shiki shiki-themes material-theme-lighter github-light github-dark","list1 = [1, 2, 3]\nlist2 = [4, 5, 6]\n\nmerged = list1 + list2\nprint(merged)\n","python","",[46,47,48,83,108,115,132],"code",{"__ignoreMap":44},[49,50,53,57,61,65,69,72,75,77,80],"span",{"class":51,"line":52},"line",1,[49,54,56],{"class":55},"su5hD","list1 ",[49,58,60],{"class":59},"smGrS","=",[49,62,64],{"class":63},"sP7_E"," [",[49,66,68],{"class":67},"srdBf","1",[49,70,71],{"class":63},",",[49,73,74],{"class":67}," 2",[49,76,71],{"class":63},[49,78,79],{"class":67}," 3",[49,81,82],{"class":63},"]\n",[49,84,86,89,91,93,96,98,101,103,106],{"class":51,"line":85},2,[49,87,88],{"class":55},"list2 ",[49,90,60],{"class":59},[49,92,64],{"class":63},[49,94,95],{"class":67},"4",[49,97,71],{"class":63},[49,99,100],{"class":67}," 5",[49,102,71],{"class":63},[49,104,105],{"class":67}," 6",[49,107,82],{"class":63},[49,109,111],{"class":51,"line":110},3,[49,112,114],{"emptyLinePlaceholder":113},true,"\n",[49,116,118,121,123,126,129],{"class":51,"line":117},4,[49,119,120],{"class":55},"merged ",[49,122,60],{"class":59},[49,124,125],{"class":55}," list1 ",[49,127,128],{"class":59},"+",[49,130,131],{"class":55}," list2\n",[49,133,135,139,142,146],{"class":51,"line":134},5,[49,136,138],{"class":137},"sptTA","print",[49,140,141],{"class":63},"(",[49,143,145],{"class":144},"slqww","merged",[49,147,148],{"class":63},")\n",[14,150,151],{},"Output:",[39,153,155],{"className":41,"code":154,"language":43,"meta":44,"style":44},"[1, 2, 3, 4, 5, 6]\n",[46,156,157],{"__ignoreMap":44},[49,158,159,162,164,166,168,170,172,174,177,179,181,183,185],{"class":51,"line":52},[49,160,161],{"class":63},"[",[49,163,68],{"class":67},[49,165,71],{"class":63},[49,167,74],{"class":67},[49,169,71],{"class":63},[49,171,79],{"class":67},[49,173,71],{"class":63},[49,175,176],{"class":67}," 4",[49,178,71],{"class":63},[49,180,100],{"class":67},[49,182,71],{"class":63},[49,184,105],{"class":67},[49,186,82],{"class":63},[14,188,189,190,192],{},"Use ",[46,191,128],{}," when you want a new list that contains all items from both lists.",[34,194,196],{"id":195},"what-this-page-helps-you-do","What this page helps you do",[21,198,199,202,205],{},[24,200,201],{},"Combine two lists into one list",[24,203,204],{},"Choose between creating a new list or changing an existing list",[24,206,207],{},"Avoid common beginner mistakes when merging lists",[34,209,211,212,214],{"id":210},"method-1-use-to-create-a-new-list","Method 1: Use ",[46,213,128],{}," to create a new list",[14,216,217],{},"This is the clearest method for most beginners.",[21,219,220,223,226,229],{},[24,221,222],{},"Best for simple cases",[24,224,225],{},"Returns a new list",[24,227,228],{},"Does not change the original lists",[24,230,231],{},"Works when both values are lists",[14,233,234],{},"Example:",[39,236,238],{"className":41,"code":237,"language":43,"meta":44,"style":44},"list1 = [1, 2, 3]\nlist2 = [4, 5, 6]\n\nmerged = list1 + list2\n\nprint(\"list1:\", list1)\nprint(\"list2:\", list2)\nprint(\"merged:\", merged)\n",[46,239,240,260,280,284,296,300,324,345],{"__ignoreMap":44},[49,241,242,244,246,248,250,252,254,256,258],{"class":51,"line":52},[49,243,56],{"class":55},[49,245,60],{"class":59},[49,247,64],{"class":63},[49,249,68],{"class":67},[49,251,71],{"class":63},[49,253,74],{"class":67},[49,255,71],{"class":63},[49,257,79],{"class":67},[49,259,82],{"class":63},[49,261,262,264,266,268,270,272,274,276,278],{"class":51,"line":85},[49,263,88],{"class":55},[49,265,60],{"class":59},[49,267,64],{"class":63},[49,269,95],{"class":67},[49,271,71],{"class":63},[49,273,100],{"class":67},[49,275,71],{"class":63},[49,277,105],{"class":67},[49,279,82],{"class":63},[49,281,282],{"class":51,"line":110},[49,283,114],{"emptyLinePlaceholder":113},[49,285,286,288,290,292,294],{"class":51,"line":117},[49,287,120],{"class":55},[49,289,60],{"class":59},[49,291,125],{"class":55},[49,293,128],{"class":59},[49,295,131],{"class":55},[49,297,298],{"class":51,"line":134},[49,299,114],{"emptyLinePlaceholder":113},[49,301,303,305,307,311,315,317,319,322],{"class":51,"line":302},6,[49,304,138],{"class":137},[49,306,141],{"class":63},[49,308,310],{"class":309},"sjJ54","\"",[49,312,314],{"class":313},"s_sjI","list1:",[49,316,310],{"class":309},[49,318,71],{"class":63},[49,320,321],{"class":144}," list1",[49,323,148],{"class":63},[49,325,327,329,331,333,336,338,340,343],{"class":51,"line":326},7,[49,328,138],{"class":137},[49,330,141],{"class":63},[49,332,310],{"class":309},[49,334,335],{"class":313},"list2:",[49,337,310],{"class":309},[49,339,71],{"class":63},[49,341,342],{"class":144}," list2",[49,344,148],{"class":63},[49,346,348,350,352,354,357,359,361,364],{"class":51,"line":347},8,[49,349,138],{"class":137},[49,351,141],{"class":63},[49,353,310],{"class":309},[49,355,356],{"class":313},"merged:",[49,358,310],{"class":309},[49,360,71],{"class":63},[49,362,363],{"class":144}," merged",[49,365,148],{"class":63},[14,367,151],{},[39,369,371],{"className":41,"code":370,"language":43,"meta":44,"style":44},"list1: [1, 2, 3]\nlist2: [4, 5, 6]\nmerged: [1, 2, 3, 4, 5, 6]\n",[46,372,373,395,416],{"__ignoreMap":44},[49,374,375,378,381,383,385,387,389,391,393],{"class":51,"line":52},[49,376,377],{"class":55},"list1",[49,379,380],{"class":63},":",[49,382,64],{"class":63},[49,384,68],{"class":67},[49,386,71],{"class":63},[49,388,74],{"class":67},[49,390,71],{"class":63},[49,392,79],{"class":67},[49,394,82],{"class":63},[49,396,397,400,402,404,406,408,410,412,414],{"class":51,"line":85},[49,398,399],{"class":55},"list2",[49,401,380],{"class":63},[49,403,64],{"class":63},[49,405,95],{"class":67},[49,407,71],{"class":63},[49,409,100],{"class":67},[49,411,71],{"class":63},[49,413,105],{"class":67},[49,415,82],{"class":63},[49,417,418,420,422,424,426,428,430,432,434,436,438,440,442,444,446],{"class":51,"line":110},[49,419,145],{"class":55},[49,421,380],{"class":63},[49,423,64],{"class":63},[49,425,68],{"class":67},[49,427,71],{"class":63},[49,429,74],{"class":67},[49,431,71],{"class":63},[49,433,79],{"class":67},[49,435,71],{"class":63},[49,437,176],{"class":67},[49,439,71],{"class":63},[49,441,100],{"class":67},[49,443,71],{"class":63},[49,445,105],{"class":67},[49,447,82],{"class":63},[449,450,452,453,455],"h3",{"id":451},"why-use","Why use ",[46,454,128],{},"?",[14,457,458,460,461,464],{},[46,459,128],{}," creates a brand new list.",[462,463],"br",{},"\nThe original lists stay the same.",[14,466,467,468,470,471,473],{},"This is useful when you want to keep ",[46,469,377],{}," and ",[46,472,399],{}," unchanged.",[14,475,476,477,482],{},"If you are still learning how lists work, this is usually the best method to start with. For a broader introduction, see ",[478,479,481],"a",{"href":480},"\u002Flearn\u002Fpython-lists-explained-beginner-guide","Python lists explained for beginners",".",[34,484,486,487,490],{"id":485},"method-2-use-extend-to-add-items-to-an-existing-list","Method 2: Use ",[46,488,489],{},"extend()"," to add items to an existing list",[14,492,189,493,495],{},[46,494,489],{}," when you want to add all items from one list into another list.",[21,497,498,501,504],{},[24,499,500],{},"Adds all items from the second list into the first list",[24,502,503],{},"Changes the original list",[24,505,506],{},"Useful when you want to keep one list and add to it",[14,508,234],{},[39,510,512],{"className":41,"code":511,"language":43,"meta":44,"style":44},"list1 = [1, 2, 3]\nlist2 = [4, 5, 6]\n\nlist1.extend(list2)\n\nprint(list1)\nprint(list2)\n",[46,513,514,534,554,558,573,577,587],{"__ignoreMap":44},[49,515,516,518,520,522,524,526,528,530,532],{"class":51,"line":52},[49,517,56],{"class":55},[49,519,60],{"class":59},[49,521,64],{"class":63},[49,523,68],{"class":67},[49,525,71],{"class":63},[49,527,74],{"class":67},[49,529,71],{"class":63},[49,531,79],{"class":67},[49,533,82],{"class":63},[49,535,536,538,540,542,544,546,548,550,552],{"class":51,"line":85},[49,537,88],{"class":55},[49,539,60],{"class":59},[49,541,64],{"class":63},[49,543,95],{"class":67},[49,545,71],{"class":63},[49,547,100],{"class":67},[49,549,71],{"class":63},[49,551,105],{"class":67},[49,553,82],{"class":63},[49,555,556],{"class":51,"line":110},[49,557,114],{"emptyLinePlaceholder":113},[49,559,560,562,564,567,569,571],{"class":51,"line":117},[49,561,377],{"class":55},[49,563,482],{"class":63},[49,565,566],{"class":144},"extend",[49,568,141],{"class":63},[49,570,399],{"class":144},[49,572,148],{"class":63},[49,574,575],{"class":51,"line":134},[49,576,114],{"emptyLinePlaceholder":113},[49,578,579,581,583,585],{"class":51,"line":302},[49,580,138],{"class":137},[49,582,141],{"class":63},[49,584,377],{"class":144},[49,586,148],{"class":63},[49,588,589,591,593,595],{"class":51,"line":326},[49,590,138],{"class":137},[49,592,141],{"class":63},[49,594,399],{"class":144},[49,596,148],{"class":63},[14,598,151],{},[39,600,602],{"className":41,"code":601,"language":43,"meta":44,"style":44},"[1, 2, 3, 4, 5, 6]\n[4, 5, 6]\n",[46,603,604,632],{"__ignoreMap":44},[49,605,606,608,610,612,614,616,618,620,622,624,626,628,630],{"class":51,"line":52},[49,607,161],{"class":63},[49,609,68],{"class":67},[49,611,71],{"class":63},[49,613,74],{"class":67},[49,615,71],{"class":63},[49,617,79],{"class":67},[49,619,71],{"class":63},[49,621,176],{"class":67},[49,623,71],{"class":63},[49,625,100],{"class":67},[49,627,71],{"class":63},[49,629,105],{"class":67},[49,631,82],{"class":63},[49,633,634,636,638,640,642,644,646],{"class":51,"line":85},[49,635,161],{"class":63},[49,637,95],{"class":67},[49,639,71],{"class":63},[49,641,100],{"class":67},[49,643,71],{"class":63},[49,645,105],{"class":67},[49,647,82],{"class":63},[449,649,651],{"id":650},"what-changed-here","What changed here?",[14,653,654,655,658,659,661],{},"After ",[46,656,657],{},"list1.extend(list2)",", ",[46,660,377],{}," is modified.",[14,663,664,666],{},[46,665,399],{}," stays the same.",[14,668,669,670,482],{},"If you want to learn more about this method, see the ",[478,671,673,674,676],{"href":672},"\u002Freference\u002Fpython-list-extend-method","Python list ",[46,675,489],{}," method",[34,678,680,681],{"id":679},"method-3-use-unpacking-with","Method 3: Use unpacking with ",[46,682,683],{},"*",[14,685,686],{},"Another way to merge lists is to use unpacking.",[14,688,689],{},"Syntax:",[39,691,693],{"className":41,"code":692,"language":43,"meta":44,"style":44},"[*list1, *list2]\n",[46,694,695],{"__ignoreMap":44},[49,696,697,699,701,703,705,708,710],{"class":51,"line":52},[49,698,161],{"class":63},[49,700,683],{"class":59},[49,702,377],{"class":55},[49,704,71],{"class":63},[49,706,707],{"class":59}," *",[49,709,399],{"class":55},[49,711,82],{"class":63},[21,713,714,717],{},[24,715,716],{},"Creates a new list",[24,718,719],{},"Helpful when combining more than two lists",[14,721,234],{},[39,723,725],{"className":41,"code":724,"language":43,"meta":44,"style":44},"list1 = [1, 2, 3]\nlist2 = [4, 5, 6]\n\nmerged = [*list1, *list2]\n\nprint(merged)\n",[46,726,727,747,767,771,791,795],{"__ignoreMap":44},[49,728,729,731,733,735,737,739,741,743,745],{"class":51,"line":52},[49,730,56],{"class":55},[49,732,60],{"class":59},[49,734,64],{"class":63},[49,736,68],{"class":67},[49,738,71],{"class":63},[49,740,74],{"class":67},[49,742,71],{"class":63},[49,744,79],{"class":67},[49,746,82],{"class":63},[49,748,749,751,753,755,757,759,761,763,765],{"class":51,"line":85},[49,750,88],{"class":55},[49,752,60],{"class":59},[49,754,64],{"class":63},[49,756,95],{"class":67},[49,758,71],{"class":63},[49,760,100],{"class":67},[49,762,71],{"class":63},[49,764,105],{"class":67},[49,766,82],{"class":63},[49,768,769],{"class":51,"line":110},[49,770,114],{"emptyLinePlaceholder":113},[49,772,773,775,777,779,781,783,785,787,789],{"class":51,"line":117},[49,774,120],{"class":55},[49,776,60],{"class":59},[49,778,64],{"class":63},[49,780,683],{"class":59},[49,782,377],{"class":55},[49,784,71],{"class":63},[49,786,707],{"class":59},[49,788,399],{"class":55},[49,790,82],{"class":63},[49,792,793],{"class":51,"line":134},[49,794,114],{"emptyLinePlaceholder":113},[49,796,797,799,801,803],{"class":51,"line":302},[49,798,138],{"class":137},[49,800,141],{"class":63},[49,802,145],{"class":144},[49,804,148],{"class":63},[14,806,151],{},[39,808,809],{"className":41,"code":154,"language":43,"meta":44,"style":44},[46,810,811],{"__ignoreMap":44},[49,812,813,815,817,819,821,823,825,827,829,831,833,835,837],{"class":51,"line":52},[49,814,161],{"class":63},[49,816,68],{"class":67},[49,818,71],{"class":63},[49,820,74],{"class":67},[49,822,71],{"class":63},[49,824,79],{"class":67},[49,826,71],{"class":63},[49,828,176],{"class":67},[49,830,71],{"class":63},[49,832,100],{"class":67},[49,834,71],{"class":63},[49,836,105],{"class":67},[49,838,82],{"class":63},[14,840,841],{},"This is especially useful when merging several lists:",[39,843,845],{"className":41,"code":844,"language":43,"meta":44,"style":44},"a = [1, 2]\nb = [3, 4]\nc = [5, 6]\n\nmerged = [*a, *b, *c]\nprint(merged)\n",[46,846,847,864,882,900,904,932],{"__ignoreMap":44},[49,848,849,852,854,856,858,860,862],{"class":51,"line":52},[49,850,851],{"class":55},"a ",[49,853,60],{"class":59},[49,855,64],{"class":63},[49,857,68],{"class":67},[49,859,71],{"class":63},[49,861,74],{"class":67},[49,863,82],{"class":63},[49,865,866,869,871,873,876,878,880],{"class":51,"line":85},[49,867,868],{"class":55},"b ",[49,870,60],{"class":59},[49,872,64],{"class":63},[49,874,875],{"class":67},"3",[49,877,71],{"class":63},[49,879,176],{"class":67},[49,881,82],{"class":63},[49,883,884,887,889,891,894,896,898],{"class":51,"line":110},[49,885,886],{"class":55},"c ",[49,888,60],{"class":59},[49,890,64],{"class":63},[49,892,893],{"class":67},"5",[49,895,71],{"class":63},[49,897,105],{"class":67},[49,899,82],{"class":63},[49,901,902],{"class":51,"line":117},[49,903,114],{"emptyLinePlaceholder":113},[49,905,906,908,910,912,914,916,918,920,923,925,927,930],{"class":51,"line":134},[49,907,120],{"class":55},[49,909,60],{"class":59},[49,911,64],{"class":63},[49,913,683],{"class":59},[49,915,478],{"class":55},[49,917,71],{"class":63},[49,919,707],{"class":59},[49,921,922],{"class":55},"b",[49,924,71],{"class":63},[49,926,707],{"class":59},[49,928,929],{"class":55},"c",[49,931,82],{"class":63},[49,933,934,936,938,940],{"class":51,"line":302},[49,935,138],{"class":137},[49,937,141],{"class":63},[49,939,145],{"class":144},[49,941,148],{"class":63},[14,943,151],{},[39,945,946],{"className":41,"code":154,"language":43,"meta":44,"style":44},[46,947,948],{"__ignoreMap":44},[49,949,950,952,954,956,958,960,962,964,966,968,970,972,974],{"class":51,"line":52},[49,951,161],{"class":63},[49,953,68],{"class":67},[49,955,71],{"class":63},[49,957,74],{"class":67},[49,959,71],{"class":63},[49,961,79],{"class":67},[49,963,71],{"class":63},[49,965,176],{"class":67},[49,967,71],{"class":63},[49,969,100],{"class":67},[49,971,71],{"class":63},[49,973,105],{"class":67},[49,975,82],{"class":63},[34,977,979],{"id":978},"when-to-use-each-method","When to use each method",[14,981,982],{},"Choose the method based on what you want to happen:",[21,984,985,990,995],{},[24,986,189,987,989],{},[46,988,128],{}," for the clearest beginner-friendly solution",[24,991,189,992,994],{},[46,993,489],{}," when you want to modify the first list",[24,996,997],{},"Use unpacking when combining several lists in one line",[14,999,1000],{},"A simple rule:",[21,1002,1003,1014],{},[24,1004,1005,1006,1010,1011,1013],{},"Want a ",[1007,1008,1009],"strong",{},"new list","? Use ",[46,1012,128],{}," or unpacking.",[24,1015,1016,1017,1010,1020,482],{},"Want to ",[1007,1018,1019],{},"change an existing list",[46,1021,489],{},[14,1023,1024,1025,1029],{},"If you need to keep the original list before changing it, you may want to ",[478,1026,1028],{"href":1027},"\u002Fhow-to\u002Fhow-to-copy-a-list-in-python\u002F","copy a list in Python"," first.",[34,1031,1033],{"id":1032},"important-detail-nested-list-vs-merged-list","Important detail: nested list vs merged list",[14,1035,1036],{},"This is one of the most common list mistakes for beginners.",[449,1038,1040,1043],{"id":1039},"appendlist2-does-not-merge-the-lists",[46,1041,1042],{},"append(list2)"," does not merge the lists",[14,1045,1046,1049],{},[46,1047,1048],{},"append()"," adds the whole second list as one single item.",[39,1051,1053],{"className":41,"code":1052,"language":43,"meta":44,"style":44},"list1 = [1, 2, 3]\nlist2 = [4, 5, 6]\n\nlist1.append(list2)\nprint(list1)\n",[46,1054,1055,1075,1095,1099,1114],{"__ignoreMap":44},[49,1056,1057,1059,1061,1063,1065,1067,1069,1071,1073],{"class":51,"line":52},[49,1058,56],{"class":55},[49,1060,60],{"class":59},[49,1062,64],{"class":63},[49,1064,68],{"class":67},[49,1066,71],{"class":63},[49,1068,74],{"class":67},[49,1070,71],{"class":63},[49,1072,79],{"class":67},[49,1074,82],{"class":63},[49,1076,1077,1079,1081,1083,1085,1087,1089,1091,1093],{"class":51,"line":85},[49,1078,88],{"class":55},[49,1080,60],{"class":59},[49,1082,64],{"class":63},[49,1084,95],{"class":67},[49,1086,71],{"class":63},[49,1088,100],{"class":67},[49,1090,71],{"class":63},[49,1092,105],{"class":67},[49,1094,82],{"class":63},[49,1096,1097],{"class":51,"line":110},[49,1098,114],{"emptyLinePlaceholder":113},[49,1100,1101,1103,1105,1108,1110,1112],{"class":51,"line":117},[49,1102,377],{"class":55},[49,1104,482],{"class":63},[49,1106,1107],{"class":144},"append",[49,1109,141],{"class":63},[49,1111,399],{"class":144},[49,1113,148],{"class":63},[49,1115,1116,1118,1120,1122],{"class":51,"line":134},[49,1117,138],{"class":137},[49,1119,141],{"class":63},[49,1121,377],{"class":144},[49,1123,148],{"class":63},[14,1125,151],{},[39,1127,1129],{"className":41,"code":1128,"language":43,"meta":44,"style":44},"[1, 2, 3, [4, 5, 6]]\n",[46,1130,1131],{"__ignoreMap":44},[49,1132,1133,1135,1137,1139,1141,1143,1145,1147,1149,1151,1153,1155,1157,1159],{"class":51,"line":52},[49,1134,161],{"class":63},[49,1136,68],{"class":67},[49,1138,71],{"class":63},[49,1140,74],{"class":67},[49,1142,71],{"class":63},[49,1144,79],{"class":67},[49,1146,71],{"class":63},[49,1148,64],{"class":63},[49,1150,95],{"class":67},[49,1152,71],{"class":63},[49,1154,100],{"class":67},[49,1156,71],{"class":63},[49,1158,105],{"class":67},[49,1160,1161],{"class":63},"]]\n",[14,1163,1164,1165,1167,1168,482],{},"Notice that ",[46,1166,399],{}," became a nested list inside ",[46,1169,377],{},[449,1171,1173,1176],{"id":1172},"extendlist2-merges-the-items",[46,1174,1175],{},"extend(list2)"," merges the items",[14,1178,1179,1181,1182,1184],{},[46,1180,489],{}," adds each item from ",[46,1183,399],{}," one by one.",[39,1186,1188],{"className":41,"code":1187,"language":43,"meta":44,"style":44},"list1 = [1, 2, 3]\nlist2 = [4, 5, 6]\n\nlist1.extend(list2)\nprint(list1)\n",[46,1189,1190,1210,1230,1234,1248],{"__ignoreMap":44},[49,1191,1192,1194,1196,1198,1200,1202,1204,1206,1208],{"class":51,"line":52},[49,1193,56],{"class":55},[49,1195,60],{"class":59},[49,1197,64],{"class":63},[49,1199,68],{"class":67},[49,1201,71],{"class":63},[49,1203,74],{"class":67},[49,1205,71],{"class":63},[49,1207,79],{"class":67},[49,1209,82],{"class":63},[49,1211,1212,1214,1216,1218,1220,1222,1224,1226,1228],{"class":51,"line":85},[49,1213,88],{"class":55},[49,1215,60],{"class":59},[49,1217,64],{"class":63},[49,1219,95],{"class":67},[49,1221,71],{"class":63},[49,1223,100],{"class":67},[49,1225,71],{"class":63},[49,1227,105],{"class":67},[49,1229,82],{"class":63},[49,1231,1232],{"class":51,"line":110},[49,1233,114],{"emptyLinePlaceholder":113},[49,1235,1236,1238,1240,1242,1244,1246],{"class":51,"line":117},[49,1237,377],{"class":55},[49,1239,482],{"class":63},[49,1241,566],{"class":144},[49,1243,141],{"class":63},[49,1245,399],{"class":144},[49,1247,148],{"class":63},[49,1249,1250,1252,1254,1256],{"class":51,"line":134},[49,1251,138],{"class":137},[49,1253,141],{"class":63},[49,1255,377],{"class":144},[49,1257,148],{"class":63},[14,1259,151],{},[39,1261,1262],{"className":41,"code":154,"language":43,"meta":44,"style":44},[46,1263,1264],{"__ignoreMap":44},[49,1265,1266,1268,1270,1272,1274,1276,1278,1280,1282,1284,1286,1288,1290],{"class":51,"line":52},[49,1267,161],{"class":63},[49,1269,68],{"class":67},[49,1271,71],{"class":63},[49,1273,74],{"class":67},[49,1275,71],{"class":63},[49,1277,79],{"class":67},[49,1279,71],{"class":63},[49,1281,176],{"class":67},[49,1283,71],{"class":63},[49,1285,100],{"class":67},[49,1287,71],{"class":63},[49,1289,105],{"class":67},[49,1291,82],{"class":63},[449,1293,1295],{"id":1294},"quick-comparison","Quick comparison",[39,1297,1299],{"className":41,"code":1298,"language":43,"meta":44,"style":44},"list1 = [1, 2]\nlist2 = [3, 4]\n\na = list1.copy()\na.append(list2)\n\nb = list1.copy()\nb.extend(list2)\n\nprint(\"append:\", a)\nprint(\"extend:\", b)\n",[46,1300,1301,1317,1333,1337,1353,1367,1371,1385,1399,1404,1425],{"__ignoreMap":44},[49,1302,1303,1305,1307,1309,1311,1313,1315],{"class":51,"line":52},[49,1304,56],{"class":55},[49,1306,60],{"class":59},[49,1308,64],{"class":63},[49,1310,68],{"class":67},[49,1312,71],{"class":63},[49,1314,74],{"class":67},[49,1316,82],{"class":63},[49,1318,1319,1321,1323,1325,1327,1329,1331],{"class":51,"line":85},[49,1320,88],{"class":55},[49,1322,60],{"class":59},[49,1324,64],{"class":63},[49,1326,875],{"class":67},[49,1328,71],{"class":63},[49,1330,176],{"class":67},[49,1332,82],{"class":63},[49,1334,1335],{"class":51,"line":110},[49,1336,114],{"emptyLinePlaceholder":113},[49,1338,1339,1341,1343,1345,1347,1350],{"class":51,"line":117},[49,1340,851],{"class":55},[49,1342,60],{"class":59},[49,1344,321],{"class":55},[49,1346,482],{"class":63},[49,1348,1349],{"class":144},"copy",[49,1351,1352],{"class":63},"()\n",[49,1354,1355,1357,1359,1361,1363,1365],{"class":51,"line":134},[49,1356,478],{"class":55},[49,1358,482],{"class":63},[49,1360,1107],{"class":144},[49,1362,141],{"class":63},[49,1364,399],{"class":144},[49,1366,148],{"class":63},[49,1368,1369],{"class":51,"line":302},[49,1370,114],{"emptyLinePlaceholder":113},[49,1372,1373,1375,1377,1379,1381,1383],{"class":51,"line":326},[49,1374,868],{"class":55},[49,1376,60],{"class":59},[49,1378,321],{"class":55},[49,1380,482],{"class":63},[49,1382,1349],{"class":144},[49,1384,1352],{"class":63},[49,1386,1387,1389,1391,1393,1395,1397],{"class":51,"line":347},[49,1388,922],{"class":55},[49,1390,482],{"class":63},[49,1392,566],{"class":144},[49,1394,141],{"class":63},[49,1396,399],{"class":144},[49,1398,148],{"class":63},[49,1400,1402],{"class":51,"line":1401},9,[49,1403,114],{"emptyLinePlaceholder":113},[49,1405,1407,1409,1411,1413,1416,1418,1420,1423],{"class":51,"line":1406},10,[49,1408,138],{"class":137},[49,1410,141],{"class":63},[49,1412,310],{"class":309},[49,1414,1415],{"class":313},"append:",[49,1417,310],{"class":309},[49,1419,71],{"class":63},[49,1421,1422],{"class":144}," a",[49,1424,148],{"class":63},[49,1426,1428,1430,1432,1434,1437,1439,1441,1444],{"class":51,"line":1427},11,[49,1429,138],{"class":137},[49,1431,141],{"class":63},[49,1433,310],{"class":309},[49,1435,1436],{"class":313},"extend:",[49,1438,310],{"class":309},[49,1440,71],{"class":63},[49,1442,1443],{"class":144}," b",[49,1445,148],{"class":63},[14,1447,151],{},[39,1449,1451],{"className":41,"code":1450,"language":43,"meta":44,"style":44},"append: [1, 2, [3, 4]]\nextend: [1, 2, 3, 4]\n",[46,1452,1453,1479],{"__ignoreMap":44},[49,1454,1455,1457,1459,1461,1463,1465,1467,1469,1471,1473,1475,1477],{"class":51,"line":52},[49,1456,1107],{"class":55},[49,1458,380],{"class":63},[49,1460,64],{"class":63},[49,1462,68],{"class":67},[49,1464,71],{"class":63},[49,1466,74],{"class":67},[49,1468,71],{"class":63},[49,1470,64],{"class":63},[49,1472,875],{"class":67},[49,1474,71],{"class":63},[49,1476,176],{"class":67},[49,1478,1161],{"class":63},[49,1480,1481,1483,1485,1487,1489,1491,1493,1495,1497,1499,1501],{"class":51,"line":85},[49,1482,566],{"class":55},[49,1484,380],{"class":63},[49,1486,64],{"class":63},[49,1488,68],{"class":67},[49,1490,71],{"class":63},[49,1492,74],{"class":67},[49,1494,71],{"class":63},[49,1496,79],{"class":67},[49,1498,71],{"class":63},[49,1500,176],{"class":67},[49,1502,82],{"class":63},[14,1504,1505,1506,1511,1512,482],{},"To learn more, compare the ",[478,1507,673,1509,676],{"href":1508},"\u002Freference\u002Fpython-list-append-method",[46,1510,1048],{}," with the ",[478,1513,673,1514,676],{"href":672},[46,1515,489],{},[34,1517,1519],{"id":1518},"common-mistakes","Common mistakes",[14,1521,1522],{},"Here are some common reasons merging lists does not work as expected.",[449,1524,1526,1527,1529,1530],{"id":1525},"using-append-instead-of-extend","Using ",[46,1528,1048],{}," instead of ",[46,1531,489],{},[14,1533,1534],{},"Problem:",[39,1536,1538],{"className":41,"code":1537,"language":43,"meta":44,"style":44},"list1 = [1, 2]\nlist2 = [3, 4]\n\nlist1.append(list2)\nprint(list1)\n",[46,1539,1540,1556,1572,1576,1590],{"__ignoreMap":44},[49,1541,1542,1544,1546,1548,1550,1552,1554],{"class":51,"line":52},[49,1543,56],{"class":55},[49,1545,60],{"class":59},[49,1547,64],{"class":63},[49,1549,68],{"class":67},[49,1551,71],{"class":63},[49,1553,74],{"class":67},[49,1555,82],{"class":63},[49,1557,1558,1560,1562,1564,1566,1568,1570],{"class":51,"line":85},[49,1559,88],{"class":55},[49,1561,60],{"class":59},[49,1563,64],{"class":63},[49,1565,875],{"class":67},[49,1567,71],{"class":63},[49,1569,176],{"class":67},[49,1571,82],{"class":63},[49,1573,1574],{"class":51,"line":110},[49,1575,114],{"emptyLinePlaceholder":113},[49,1577,1578,1580,1582,1584,1586,1588],{"class":51,"line":117},[49,1579,377],{"class":55},[49,1581,482],{"class":63},[49,1583,1107],{"class":144},[49,1585,141],{"class":63},[49,1587,399],{"class":144},[49,1589,148],{"class":63},[49,1591,1592,1594,1596,1598],{"class":51,"line":134},[49,1593,138],{"class":137},[49,1595,141],{"class":63},[49,1597,377],{"class":144},[49,1599,148],{"class":63},[14,1601,151],{},[39,1603,1605],{"className":41,"code":1604,"language":43,"meta":44,"style":44},"[1, 2, [3, 4]]\n",[46,1606,1607],{"__ignoreMap":44},[49,1608,1609,1611,1613,1615,1617,1619,1621,1623,1625,1627],{"class":51,"line":52},[49,1610,161],{"class":63},[49,1612,68],{"class":67},[49,1614,71],{"class":63},[49,1616,74],{"class":67},[49,1618,71],{"class":63},[49,1620,64],{"class":63},[49,1622,875],{"class":67},[49,1624,71],{"class":63},[49,1626,176],{"class":67},[49,1628,1161],{"class":63},[14,1630,1631,1632,1634],{},"Fix: use ",[46,1633,489],{}," if you want to add the items individually.",[39,1636,1638],{"className":41,"code":1637,"language":43,"meta":44,"style":44},"list1 = [1, 2]\nlist2 = [3, 4]\n\nlist1.extend(list2)\nprint(list1)\n",[46,1639,1640,1656,1672,1676,1690],{"__ignoreMap":44},[49,1641,1642,1644,1646,1648,1650,1652,1654],{"class":51,"line":52},[49,1643,56],{"class":55},[49,1645,60],{"class":59},[49,1647,64],{"class":63},[49,1649,68],{"class":67},[49,1651,71],{"class":63},[49,1653,74],{"class":67},[49,1655,82],{"class":63},[49,1657,1658,1660,1662,1664,1666,1668,1670],{"class":51,"line":85},[49,1659,88],{"class":55},[49,1661,60],{"class":59},[49,1663,64],{"class":63},[49,1665,875],{"class":67},[49,1667,71],{"class":63},[49,1669,176],{"class":67},[49,1671,82],{"class":63},[49,1673,1674],{"class":51,"line":110},[49,1675,114],{"emptyLinePlaceholder":113},[49,1677,1678,1680,1682,1684,1686,1688],{"class":51,"line":117},[49,1679,377],{"class":55},[49,1681,482],{"class":63},[49,1683,566],{"class":144},[49,1685,141],{"class":63},[49,1687,399],{"class":144},[49,1689,148],{"class":63},[49,1691,1692,1694,1696,1698],{"class":51,"line":134},[49,1693,138],{"class":137},[49,1695,141],{"class":63},[49,1697,377],{"class":144},[49,1699,148],{"class":63},[449,1701,1703,1704,1706],{"id":1702},"expecting-extend-to-return-a-new-list","Expecting ",[46,1705,489],{}," to return a new list",[14,1708,1709],{},"This is a very common mistake.",[14,1711,1712],{},"Wrong:",[39,1714,1716],{"className":41,"code":1715,"language":43,"meta":44,"style":44},"list1 = [1, 2]\nlist2 = [3, 4]\n\nmerged = list1.extend(list2)\nprint(merged)\n",[46,1717,1718,1734,1750,1754,1772],{"__ignoreMap":44},[49,1719,1720,1722,1724,1726,1728,1730,1732],{"class":51,"line":52},[49,1721,56],{"class":55},[49,1723,60],{"class":59},[49,1725,64],{"class":63},[49,1727,68],{"class":67},[49,1729,71],{"class":63},[49,1731,74],{"class":67},[49,1733,82],{"class":63},[49,1735,1736,1738,1740,1742,1744,1746,1748],{"class":51,"line":85},[49,1737,88],{"class":55},[49,1739,60],{"class":59},[49,1741,64],{"class":63},[49,1743,875],{"class":67},[49,1745,71],{"class":63},[49,1747,176],{"class":67},[49,1749,82],{"class":63},[49,1751,1752],{"class":51,"line":110},[49,1753,114],{"emptyLinePlaceholder":113},[49,1755,1756,1758,1760,1762,1764,1766,1768,1770],{"class":51,"line":117},[49,1757,120],{"class":55},[49,1759,60],{"class":59},[49,1761,321],{"class":55},[49,1763,482],{"class":63},[49,1765,566],{"class":144},[49,1767,141],{"class":63},[49,1769,399],{"class":144},[49,1771,148],{"class":63},[49,1773,1774,1776,1778,1780],{"class":51,"line":134},[49,1775,138],{"class":137},[49,1777,141],{"class":63},[49,1779,145],{"class":144},[49,1781,148],{"class":63},[14,1783,151],{},[39,1785,1787],{"className":41,"code":1786,"language":43,"meta":44,"style":44},"None\n",[46,1788,1789],{"__ignoreMap":44},[49,1790,1791],{"class":51,"line":52},[49,1792,1786],{"class":1793},"s39Yj",[14,1795,1796,1797,1799,1800,482],{},"Why? Because ",[46,1798,489],{}," changes the list in place and returns ",[46,1801,1802],{},"None",[14,1804,1805],{},"Correct:",[39,1807,1808],{"className":41,"code":1637,"language":43,"meta":44,"style":44},[46,1809,1810,1826,1842,1846,1860],{"__ignoreMap":44},[49,1811,1812,1814,1816,1818,1820,1822,1824],{"class":51,"line":52},[49,1813,56],{"class":55},[49,1815,60],{"class":59},[49,1817,64],{"class":63},[49,1819,68],{"class":67},[49,1821,71],{"class":63},[49,1823,74],{"class":67},[49,1825,82],{"class":63},[49,1827,1828,1830,1832,1834,1836,1838,1840],{"class":51,"line":85},[49,1829,88],{"class":55},[49,1831,60],{"class":59},[49,1833,64],{"class":63},[49,1835,875],{"class":67},[49,1837,71],{"class":63},[49,1839,176],{"class":67},[49,1841,82],{"class":63},[49,1843,1844],{"class":51,"line":110},[49,1845,114],{"emptyLinePlaceholder":113},[49,1847,1848,1850,1852,1854,1856,1858],{"class":51,"line":117},[49,1849,377],{"class":55},[49,1851,482],{"class":63},[49,1853,566],{"class":144},[49,1855,141],{"class":63},[49,1857,399],{"class":144},[49,1859,148],{"class":63},[49,1861,1862,1864,1866,1868],{"class":51,"line":134},[49,1863,138],{"class":137},[49,1865,141],{"class":63},[49,1867,377],{"class":144},[49,1869,148],{"class":63},[449,1871,1873],{"id":1872},"trying-to-merge-a-list-with-a-non-list-value","Trying to merge a list with a non-list value",[14,1875,1876,1878],{},[46,1877,128],{}," works when both values are lists.",[14,1880,1712],{},[39,1882,1884],{"className":41,"code":1883,"language":43,"meta":44,"style":44},"list1 = [1, 2, 3]\nvalue = 4\n\nmerged = list1 + value\n",[46,1885,1886,1906,1916,1920],{"__ignoreMap":44},[49,1887,1888,1890,1892,1894,1896,1898,1900,1902,1904],{"class":51,"line":52},[49,1889,56],{"class":55},[49,1891,60],{"class":59},[49,1893,64],{"class":63},[49,1895,68],{"class":67},[49,1897,71],{"class":63},[49,1899,74],{"class":67},[49,1901,71],{"class":63},[49,1903,79],{"class":67},[49,1905,82],{"class":63},[49,1907,1908,1911,1913],{"class":51,"line":85},[49,1909,1910],{"class":55},"value ",[49,1912,60],{"class":59},[49,1914,1915],{"class":67}," 4\n",[49,1917,1918],{"class":51,"line":110},[49,1919,114],{"emptyLinePlaceholder":113},[49,1921,1922,1924,1926,1928,1930],{"class":51,"line":117},[49,1923,120],{"class":55},[49,1925,60],{"class":59},[49,1927,125],{"class":55},[49,1929,128],{"class":59},[49,1931,1932],{"class":55}," value\n",[14,1934,1935,1936,1939],{},"This causes an error because ",[46,1937,1938],{},"value"," is not a list.",[14,1941,1805],{},[39,1943,1945],{"className":41,"code":1944,"language":43,"meta":44,"style":44},"list1 = [1, 2, 3]\nvalue = 4\n\nmerged = list1 + [value]\nprint(merged)\n",[46,1946,1947,1967,1975,1979,1995],{"__ignoreMap":44},[49,1948,1949,1951,1953,1955,1957,1959,1961,1963,1965],{"class":51,"line":52},[49,1950,56],{"class":55},[49,1952,60],{"class":59},[49,1954,64],{"class":63},[49,1956,68],{"class":67},[49,1958,71],{"class":63},[49,1960,74],{"class":67},[49,1962,71],{"class":63},[49,1964,79],{"class":67},[49,1966,82],{"class":63},[49,1968,1969,1971,1973],{"class":51,"line":85},[49,1970,1910],{"class":55},[49,1972,60],{"class":59},[49,1974,1915],{"class":67},[49,1976,1977],{"class":51,"line":110},[49,1978,114],{"emptyLinePlaceholder":113},[49,1980,1981,1983,1985,1987,1989,1991,1993],{"class":51,"line":117},[49,1982,120],{"class":55},[49,1984,60],{"class":59},[49,1986,125],{"class":55},[49,1988,128],{"class":59},[49,1990,64],{"class":63},[49,1992,1938],{"class":55},[49,1994,82],{"class":63},[49,1996,1997,1999,2001,2003],{"class":51,"line":134},[49,1998,138],{"class":137},[49,2000,141],{"class":63},[49,2002,145],{"class":144},[49,2004,148],{"class":63},[14,2006,151],{},[39,2008,2010],{"className":41,"code":2009,"language":43,"meta":44,"style":44},"[1, 2, 3, 4]\n",[46,2011,2012],{"__ignoreMap":44},[49,2013,2014,2016,2018,2020,2022,2024,2026,2028,2030],{"class":51,"line":52},[49,2015,161],{"class":63},[49,2017,68],{"class":67},[49,2019,71],{"class":63},[49,2021,74],{"class":67},[49,2023,71],{"class":63},[49,2025,79],{"class":67},[49,2027,71],{"class":63},[49,2029,176],{"class":67},[49,2031,82],{"class":63},[14,2033,2034,2035,482],{},"If you only want to add one item, see ",[478,2036,2038],{"href":2037},"\u002Fhow-to\u002Fhow-to-add-an-item-to-a-list-in-python\u002F","how to add an item to a list in Python",[449,2040,2042,2043,2045],{"id":2041},"forgetting-that-creates-a-new-list","Forgetting that ",[46,2044,128],{}," creates a new list",[14,2047,2048,2049,380],{},"This does not change ",[46,2050,377],{},[39,2052,2054],{"className":41,"code":2053,"language":43,"meta":44,"style":44},"list1 = [1, 2]\nlist2 = [3, 4]\n\nlist1 + list2\nprint(list1)\n",[46,2055,2056,2072,2088,2092,2100],{"__ignoreMap":44},[49,2057,2058,2060,2062,2064,2066,2068,2070],{"class":51,"line":52},[49,2059,56],{"class":55},[49,2061,60],{"class":59},[49,2063,64],{"class":63},[49,2065,68],{"class":67},[49,2067,71],{"class":63},[49,2069,74],{"class":67},[49,2071,82],{"class":63},[49,2073,2074,2076,2078,2080,2082,2084,2086],{"class":51,"line":85},[49,2075,88],{"class":55},[49,2077,60],{"class":59},[49,2079,64],{"class":63},[49,2081,875],{"class":67},[49,2083,71],{"class":63},[49,2085,176],{"class":67},[49,2087,82],{"class":63},[49,2089,2090],{"class":51,"line":110},[49,2091,114],{"emptyLinePlaceholder":113},[49,2093,2094,2096,2098],{"class":51,"line":117},[49,2095,56],{"class":55},[49,2097,128],{"class":59},[49,2099,131],{"class":55},[49,2101,2102,2104,2106,2108],{"class":51,"line":134},[49,2103,138],{"class":137},[49,2105,141],{"class":63},[49,2107,377],{"class":144},[49,2109,148],{"class":63},[14,2111,151],{},[39,2113,2115],{"className":41,"code":2114,"language":43,"meta":44,"style":44},"[1, 2]\n",[46,2116,2117],{"__ignoreMap":44},[49,2118,2119,2121,2123,2125,2127],{"class":51,"line":52},[49,2120,161],{"class":63},[49,2122,68],{"class":67},[49,2124,71],{"class":63},[49,2126,74],{"class":67},[49,2128,82],{"class":63},[14,2130,2131],{},"To keep the merged result, assign it to a variable:",[39,2133,2135],{"className":41,"code":2134,"language":43,"meta":44,"style":44},"list1 = [1, 2]\nlist2 = [3, 4]\n\nmerged = list1 + list2\nprint(merged)\n",[46,2136,2137,2153,2169,2173,2185],{"__ignoreMap":44},[49,2138,2139,2141,2143,2145,2147,2149,2151],{"class":51,"line":52},[49,2140,56],{"class":55},[49,2142,60],{"class":59},[49,2144,64],{"class":63},[49,2146,68],{"class":67},[49,2148,71],{"class":63},[49,2150,74],{"class":67},[49,2152,82],{"class":63},[49,2154,2155,2157,2159,2161,2163,2165,2167],{"class":51,"line":85},[49,2156,88],{"class":55},[49,2158,60],{"class":59},[49,2160,64],{"class":63},[49,2162,875],{"class":67},[49,2164,71],{"class":63},[49,2166,176],{"class":67},[49,2168,82],{"class":63},[49,2170,2171],{"class":51,"line":110},[49,2172,114],{"emptyLinePlaceholder":113},[49,2174,2175,2177,2179,2181,2183],{"class":51,"line":117},[49,2176,120],{"class":55},[49,2178,60],{"class":59},[49,2180,125],{"class":55},[49,2182,128],{"class":59},[49,2184,131],{"class":55},[49,2186,2187,2189,2191,2193],{"class":51,"line":134},[49,2188,138],{"class":137},[49,2190,141],{"class":63},[49,2192,145],{"class":144},[49,2194,148],{"class":63},[34,2196,2198],{"id":2197},"debugging-tips","Debugging tips",[14,2200,2201],{},"If your result is not what you expected, print the values and types:",[39,2203,2205],{"className":41,"code":2204,"language":43,"meta":44,"style":44},"print(list1)\nprint(list2)\nprint(type(list1))\nprint(type(list2))\nprint(merged)\n",[46,2206,2207,2217,2227,2244,2258],{"__ignoreMap":44},[49,2208,2209,2211,2213,2215],{"class":51,"line":52},[49,2210,138],{"class":137},[49,2212,141],{"class":63},[49,2214,377],{"class":144},[49,2216,148],{"class":63},[49,2218,2219,2221,2223,2225],{"class":51,"line":85},[49,2220,138],{"class":137},[49,2222,141],{"class":63},[49,2224,399],{"class":144},[49,2226,148],{"class":63},[49,2228,2229,2231,2233,2237,2239,2241],{"class":51,"line":110},[49,2230,138],{"class":137},[49,2232,141],{"class":63},[49,2234,2236],{"class":2235},"sZMiF","type",[49,2238,141],{"class":63},[49,2240,377],{"class":144},[49,2242,2243],{"class":63},"))\n",[49,2245,2246,2248,2250,2252,2254,2256],{"class":51,"line":117},[49,2247,138],{"class":137},[49,2249,141],{"class":63},[49,2251,2236],{"class":2235},[49,2253,141],{"class":63},[49,2255,399],{"class":144},[49,2257,2243],{"class":63},[49,2259,2260,2262,2264,2266],{"class":51,"line":134},[49,2261,138],{"class":137},[49,2263,141],{"class":63},[49,2265,145],{"class":144},[49,2267,148],{"class":63},[14,2269,2270],{},"These checks help you see:",[21,2272,2273,2276,2279],{},[24,2274,2275],{},"Whether your variables are really lists",[24,2277,2278],{},"Whether one of the lists changed",[24,2280,2281,2282,2284],{},"Whether ",[46,2283,145],{}," contains the result you expected",[34,2286,2288],{"id":2287},"faq","FAQ",[449,2290,2292],{"id":2291},"what-is-the-easiest-way-to-merge-two-lists-in-python","What is the easiest way to merge two lists in Python?",[14,2294,189,2295,2298],{},[46,2296,2297],{},"list1 + list2"," if you want a simple new list.",[449,2300,2302,2303,470,2305,455],{"id":2301},"what-is-the-difference-between-append-and-extend","What is the difference between ",[46,2304,1048],{},[46,2306,489],{},[14,2308,2309,2311,2312,2314,2316],{},[46,2310,1048],{}," adds one item.",[462,2313],{},[46,2315,489],{}," adds each item from another iterable.",[449,2318,2320,2321,2323],{"id":2319},"does-extend-return-a-new-list","Does ",[46,2322,489],{}," return a new list?",[14,2325,2326,2327,482],{},"No. It changes the existing list and returns ",[46,2328,1802],{},[449,2330,2332],{"id":2331},"can-i-merge-more-than-two-lists","Can I merge more than two lists?",[14,2334,2335,2336,2338,2339,482],{},"Yes. You can use ",[46,2337,128],{}," multiple times or use unpacking like ",[46,2340,2341],{},"[*a, *b, *c]",[34,2343,2345],{"id":2344},"see-also","See also",[21,2347,2348,2354,2360,2365,2370],{},[24,2349,2350],{},[478,2351,673,2352,676],{"href":1508},[46,2353,1048],{},[24,2355,2356],{},[478,2357,673,2358,676],{"href":672},[46,2359,489],{},[24,2361,2362],{},[478,2363,2364],{"href":2037},"How to add an item to a list in Python",[24,2366,2367],{},[478,2368,2369],{"href":1027},"How to copy a list in Python",[24,2371,2372],{},[478,2373,481],{"href":480},[2375,2376,2377],"style",{},"html pre.shiki code .su5hD, html code.shiki .su5hD{--shiki-light:#90A4AE;--shiki-default:#24292E;--shiki-dark:#E1E4E8}html pre.shiki code .smGrS, html code.shiki .smGrS{--shiki-light:#39ADB5;--shiki-default:#D73A49;--shiki-dark:#F97583}html pre.shiki code .sP7_E, html code.shiki .sP7_E{--shiki-light:#39ADB5;--shiki-default:#24292E;--shiki-dark:#E1E4E8}html pre.shiki code .srdBf, html code.shiki .srdBf{--shiki-light:#F76D47;--shiki-default:#005CC5;--shiki-dark:#79B8FF}html pre.shiki code .sptTA, html code.shiki .sptTA{--shiki-light:#6182B8;--shiki-default:#005CC5;--shiki-dark:#79B8FF}html pre.shiki code .slqww, html code.shiki .slqww{--shiki-light:#6182B8;--shiki-default:#24292E;--shiki-dark:#E1E4E8}html .light .shiki span {color: var(--shiki-light);background: var(--shiki-light-bg);font-style: var(--shiki-light-font-style);font-weight: var(--shiki-light-font-weight);text-decoration: var(--shiki-light-text-decoration);}html.light .shiki span {color: var(--shiki-light);background: var(--shiki-light-bg);font-style: var(--shiki-light-font-style);font-weight: var(--shiki-light-font-weight);text-decoration: var(--shiki-light-text-decoration);}html .default .shiki span {color: var(--shiki-default);background: var(--shiki-default-bg);font-style: var(--shiki-default-font-style);font-weight: var(--shiki-default-font-weight);text-decoration: var(--shiki-default-text-decoration);}html .shiki span {color: var(--shiki-default);background: var(--shiki-default-bg);font-style: var(--shiki-default-font-style);font-weight: var(--shiki-default-font-weight);text-decoration: var(--shiki-default-text-decoration);}html .dark .shiki span {color: var(--shiki-dark);background: var(--shiki-dark-bg);font-style: var(--shiki-dark-font-style);font-weight: var(--shiki-dark-font-weight);text-decoration: var(--shiki-dark-text-decoration);}html.dark .shiki span {color: var(--shiki-dark);background: var(--shiki-dark-bg);font-style: var(--shiki-dark-font-style);font-weight: var(--shiki-dark-font-weight);text-decoration: var(--shiki-dark-text-decoration);}html pre.shiki code .sjJ54, html code.shiki .sjJ54{--shiki-light:#39ADB5;--shiki-default:#032F62;--shiki-dark:#9ECBFF}html pre.shiki code .s_sjI, html code.shiki .s_sjI{--shiki-light:#91B859;--shiki-default:#032F62;--shiki-dark:#9ECBFF}html pre.shiki code .s39Yj, html code.shiki .s39Yj{--shiki-light:#39ADB5;--shiki-default:#005CC5;--shiki-dark:#79B8FF}html pre.shiki code .sZMiF, html code.shiki .sZMiF{--shiki-light:#E2931D;--shiki-default:#005CC5;--shiki-dark:#79B8FF}",{"title":44,"searchDepth":85,"depth":85,"links":2379},[2380,2381,2382,2387,2391,2393,2394,2401,2410,2411,2419],{"id":36,"depth":85,"text":37},{"id":195,"depth":85,"text":196},{"id":210,"depth":85,"text":2383,"children":2384},"Method 1: Use + to create a new list",[2385],{"id":451,"depth":110,"text":2386},"Why use +?",{"id":485,"depth":85,"text":2388,"children":2389},"Method 2: Use extend() to add items to an existing list",[2390],{"id":650,"depth":110,"text":651},{"id":679,"depth":85,"text":2392},"Method 3: Use unpacking with *",{"id":978,"depth":85,"text":979},{"id":1032,"depth":85,"text":1033,"children":2395},[2396,2398,2400],{"id":1039,"depth":110,"text":2397},"append(list2) does not merge the lists",{"id":1172,"depth":110,"text":2399},"extend(list2) merges the items",{"id":1294,"depth":110,"text":1295},{"id":1518,"depth":85,"text":1519,"children":2402},[2403,2405,2407,2408],{"id":1525,"depth":110,"text":2404},"Using append() instead of extend()",{"id":1702,"depth":110,"text":2406},"Expecting extend() to return a new list",{"id":1872,"depth":110,"text":1873},{"id":2041,"depth":110,"text":2409},"Forgetting that + creates a new list",{"id":2197,"depth":85,"text":2198},{"id":2287,"depth":85,"text":2288,"children":2412},[2413,2414,2416,2418],{"id":2291,"depth":110,"text":2292},{"id":2301,"depth":110,"text":2415},"What is the difference between append() and extend()?",{"id":2319,"depth":110,"text":2417},"Does extend() return a new list?",{"id":2331,"depth":110,"text":2332},{"id":2344,"depth":85,"text":2345},"Master how to merge two lists in python in our comprehensive Python beginner guide.","md",{},"\u002Fhow-to\u002Fhow-to-merge-two-lists-in-python",{"title":5,"description":2420},"how-to\u002Fhow-to-merge-two-lists-in-python","D3nDXqIro04UYAOE4SIJVYbEGmD77Slp4jWUMOeR6_8",1777585513022]