{"id":76325,"date":"2018-10-16T17:54:00","date_gmt":"2018-10-16T08:54:00","guid":{"rendered":"https:\/\/www.sejuku.net\/blog\/?p=76325"},"modified":"2024-05-06T11:53:03","modified_gmt":"2024-05-06T02:53:03","slug":"pd-merge","status":"publish","type":"post","link":"https:\/\/www.sejuku.net\/blog\/76325","title":{"rendered":"Pandas\u30672\u3064\u306eDataFrame\u3092\u7d50\u5408\u3059\u308bpd.merge\u306e\u4f7f\u3044\u65b9\u3092\u30c1\u30a7\u30c3\u30af\uff01"},"content":{"rendered":"

\u3053\u306e\u8a18\u4e8b\u3067\u306f2\u3064\u306epandas.DataFrame\u3092\u7d50\u5408\u3059\u308b\u95a2\u6570pd.merge\u306b\u3064\u3044\u3066\u7d39\u4ecb\u3057\u307e\u3059\u3002pandas.DataFrame.merge\u30e1\u30bd\u30c3\u30c9\u3068\u3057\u3066\u3082\u540c\u3058\u6a5f\u80fd\u304c\u63d0\u4f9b\u3055\u308c\u3066\u3044\u308b\u306e\u3067\u3001\u3069\u3061\u3089\u304b\u597d\u304d\u306a\u65b9\u3092\u4f7f\u3063\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n

\u3053\u306e\u95a2\u6570\u306f2\u3064\u306eDataFrame\u3092\u6a2a\u65b9\u5411\u306b\u7d50\u5408\u3059\u308b\u6a5f\u80fd\u304c\u3042\u308a\u307e\u3059\u3002\u30c7\u30fc\u30bf\u89e3\u6790\u3067\u7279\u5fb4\u91cf\u3092\u305d\u308c\u305e\u308c\u306eDataFrame\u3067\u4f5c\u3063\u305f\u5f8c\u306b\u7d50\u5408\u3059\u308b\u3001\u306a\u3069\u306e\u4f7f\u3044\u65b9\u304c\u3067\u304d\u308b\u306e\u3067\u3001\u305c\u3072\u899a\u3048\u3066\u304a\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n

pandas.merge\u306e\u4f7f\u3044\u65b9[\u57fa\u672c\u7de8]<\/h2>\n
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\u524d\u6e96\u5099<\/h3>\n

\u30b5\u30f3\u30d7\u30eb\u306eDataFrame\u30922\u3064\u7528\u610f\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n<\/div>\n<\/div>\n<\/div>\n

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In\u00a0[1]:<\/div>\n
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import pandas as pd \r\nimport numpy as np<\/pre>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n
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In\u00a0[2]:<\/div>\n
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data = np.arange(0,20).reshape(4,5)\r\nfeature_names = np.array([\"a\",\"b\",\"c\",\"d\",\"e\"])\r\ndf1 = pd.DataFrame(data[:,:3], \r\n                   columns=feature_names[:3])\r\n\r\ndf1<\/pre>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n
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Out[2]:<\/div>\n
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0<\/th>\n0<\/td>\n1<\/td>\n2<\/td>\n<\/tr>\n
1<\/th>\n5<\/td>\n6<\/td>\n7<\/td>\n<\/tr>\n
2<\/th>\n10<\/td>\n11<\/td>\n12<\/td>\n<\/tr>\n
3<\/th>\n15<\/td>\n16<\/td>\n17<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n
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In\u00a0[3]:<\/div>\n
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df2 = pd.DataFrame(data[:,[2,3,4,0]], \r\n                   columns=feature_names[[2,3,4,0]])\r\n\r\ndf2<\/pre>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n
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Out[3]:<\/div>\n
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0<\/th>\n2<\/td>\n3<\/td>\n4<\/td>\n0<\/td>\n<\/tr>\n
1<\/th>\n7<\/td>\n8<\/td>\n9<\/td>\n5<\/td>\n<\/tr>\n
2<\/th>\n12<\/td>\n13<\/td>\n14<\/td>\n10<\/td>\n<\/tr>\n
3<\/th>\n17<\/td>\n18<\/td>\n19<\/td>\n15<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n
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2\u3064\u306eDataFrame\u3092\u6a2a\u306b\u7d50\u5408<\/h3>\n
pd.merge\u306f2\u3064\u306eDataFrame\u3092\u6a2a\u306b\u7d50\u5408\u3059\u308b\u95a2\u6570\u3067\u3059\u3002\u3053\u306e\u6a5f\u80fd\u3092\u4f7f\u3046\u3053\u3068\u3067\u30012\u3064\u306eDataFrame\u306e\u540c\u3058\u5217\u3092\u7d71\u5408\u3057\u3066\u65b0\u3057\u3044DataFrame\u3092\u4f5c\u6210\u3067\u304d\u307e\u3059\u3002<\/p>\n<\/div>\n<\/div>\n<\/div>\n
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In\u00a0[4]:<\/div>\n
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pd.merge(df1,df2)<\/pre>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n
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Out[4]:<\/div>\n
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<\/th>\na<\/th>\nb<\/th>\nc<\/th>\nd<\/th>\ne<\/th>\n<\/tr>\n<\/thead>\n
0<\/th>\n0<\/td>\n1<\/td>\n2<\/td>\n3<\/td>\n4<\/td>\n<\/tr>\n
1<\/th>\n5<\/td>\n6<\/td>\n7<\/td>\n8<\/td>\n9<\/td>\n<\/tr>\n
2<\/th>\n10<\/td>\n11<\/td>\n12<\/td>\n13<\/td>\n14<\/td>\n<\/tr>\n
3<\/th>\n15<\/td>\n16<\/td>\n17<\/td>\n18<\/td>\n19<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n
pandas.merge\u306e\u4f7f\u3044\u65b9[\u5fdc\u7528\u7de8]<\/h2>\n
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on\u5f15\u6570\u3067\u660e\u793a\u7684\u306b\u7d71\u5408\u3059\u308b\u5217\u3092\u6307\u5b9a<\/h3>\n
on\u5f15\u6570\u306b\u7d71\u5408\u3055\u305b\u305f\u3044\u5217\u540d\u3092\u6307\u5b9a\u3059\u308b\u3053\u3068\u3067\u3001\u305d\u306e\u5217\u306e\u307f\u3092\u7d71\u5408\u3057\u305f\u65b0\u3057\u3044DataFrame\u3092\u4f5c\u6210\u3067\u304d\u307e\u3059\u3002<\/p>\n
\u3053\u3053\u3067\u6307\u5b9a\u3057\u305f\u5217\u4ee5\u5916\u3067\u91cd\u8907\u7b87\u6240\u304c\u3042\u308b\u5834\u5408\u306f\u3001c_x, c_y\u306e\u3088\u3046\u306b\u7b2c\u4e00\u5f15\u6570\u3068\u7b2c\u4e8c\u5f15\u6570\u306eDataFrame\u306e\u5217\u304c\u533a\u5225\u3067\u304d\u308b\u3088\u3046\u306a\u540d\u524d\u304c\u5272\u308a\u5f53\u3066\u3089\u308c\u307e\u3059\u3002<\/p>\n<\/div>\n<\/div>\n<\/div>\n
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In\u00a0[5]:<\/div>\n
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pd.merge(df1,df2, on=\"a\")<\/pre>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n
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Out[5]:<\/div>\n
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<\/th>\na<\/th>\nb<\/th>\nc_x<\/th>\nc_y<\/th>\nd<\/th>\ne<\/th>\n<\/tr>\n<\/thead>\n
0<\/th>\n0<\/td>\n1<\/td>\n2<\/td>\n2<\/td>\n3<\/td>\n4<\/td>\n<\/tr>\n
1<\/th>\n5<\/td>\n6<\/td>\n7<\/td>\n7<\/td>\n8<\/td>\n9<\/td>\n<\/tr>\n
2<\/th>\n10<\/td>\n11<\/td>\n12<\/td>\n12<\/td>\n13<\/td>\n14<\/td>\n<\/tr>\n
3<\/th>\n15<\/td>\n16<\/td>\n17<\/td>\n17<\/td>\n18<\/td>\n19<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n
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In\u00a0[6]:<\/div>\n
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pd.merge(df1,df2, on=\"c\")<\/pre>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n
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Out[6]:<\/div>\n
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\n\n\n\n\n\n\n\n\n
<\/th>\na_x<\/th>\nb<\/th>\nc<\/th>\nd<\/th>\ne<\/th>\na_y<\/th>\n<\/tr>\n<\/thead>\n
0<\/th>\n0<\/td>\n1<\/td>\n2<\/td>\n3<\/td>\n4<\/td>\n0<\/td>\n<\/tr>\n
1<\/th>\n5<\/td>\n6<\/td>\n7<\/td>\n8<\/td>\n9<\/td>\n5<\/td>\n<\/tr>\n
2<\/th>\n10<\/td>\n11<\/td>\n12<\/td>\n13<\/td>\n14<\/td>\n10<\/td>\n<\/tr>\n
3<\/th>\n15<\/td>\n16<\/td>\n17<\/td>\n18<\/td>\n19<\/td>\n15<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n
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\u8907\u6570\u306e\u5217\u3092\u6307\u5b9a\u3059\u308b\u5834\u5408\u306flist\u306b\u307e\u3068\u3081\u308c\u3070OK\u3067\u3059\u3002<\/p>\n<\/div>\n<\/div>\n<\/div>\n
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In\u00a0[7]:<\/div>\n
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pd.merge(df1,df2, on=[\"a\",\"c\"])<\/pre>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n
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Out[7]:<\/div>\n
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<\/th>\na<\/th>\nb<\/th>\nc<\/th>\nd<\/th>\ne<\/th>\n<\/tr>\n<\/thead>\n
0<\/th>\n0<\/td>\n1<\/td>\n2<\/td>\n3<\/td>\n4<\/td>\n<\/tr>\n
1<\/th>\n5<\/td>\n6<\/td>\n7<\/td>\n8<\/td>\n9<\/td>\n<\/tr>\n
2<\/th>\n10<\/td>\n11<\/td>\n12<\/td>\n13<\/td>\n14<\/td>\n<\/tr>\n
3<\/th>\n15<\/td>\n16<\/td>\n17<\/td>\n18<\/td>\n19<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n
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how\u5f15\u6570\u3067\u7d50\u5408\u306e\u65b9\u6cd5\u3092\u5909\u3048\u308b<\/h3>\n
how\u5f15\u6570\u306f\u4f55\u3082\u6307\u5b9a\u3057\u306a\u3044\u5834\u5408\u3001how=”inner”\u3068\u3055\u308c\u3066\u3044\u307e\u3059\u3002\u3053\u308c\u306fDataFrame\u540c\u58eb\u3092\u3069\u3046\u3084\u3063\u3066\u7d50\u5408\u3059\u308b\u304b\u3092\u6c7a\u3081\u3066\u3044\u307e\u3059\u3002how\u306e\u5024\u306f\u4ee5\u4e0b\u306e4\u3064\u304c\u4f7f\u3048\u307e\u3059\u3002<\/p>\n
\n
  • inner<\/b><\/li>\n
    \u7b2c\u4e00\u5f15\u6570\u3068\u7b2c\u4e8c\u5f15\u6570\u3067\u5171\u901a\u3059\u308b\u5217\u3092\u4f7f\u3046<\/p>\n
  • outer<\/b><\/li>\n
    \u7b2c\u4e00\u5f15\u6570\u3068\u7b2c\u4e8c\u5f15\u6570\u306e\u4e21\u65b9\u306e\u5217\u3092\u4f7f\u3046<\/p>\n
  • left<\/b><\/li>\n
    \u7b2c\u4e00\u5f15\u6570\uff08\u5de6\uff09\u306e\u5217\u3092\u3059\u3079\u3066\u4f7f\u3046<\/p>\n
  • right<\/b><\/li>\n
    \u7b2c\u4e8c\u5f15\u6570\uff08\u53f3\uff09\u306e\u5217\u3092\u3059\u3079\u3066\u4f7f\u3046<\/div><\/p>\n<\/div>\n<\/div>\n<\/div>\n
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    In\u00a0[8]:<\/div>\n
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    df3 = df2.copy()\r\ndf3[\"a\"]= [10,20,30,40]\r\ndf3<\/pre>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n
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    Out[8]:<\/div>\n
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    \n\n\n\n\n\n\n\n\n
    <\/th>\nc<\/th>\nd<\/th>\ne<\/th>\na<\/th>\n<\/tr>\n<\/thead>\n
    0<\/th>\n2<\/td>\n3<\/td>\n4<\/td>\n10<\/td>\n<\/tr>\n
    1<\/th>\n7<\/td>\n8<\/td>\n9<\/td>\n20<\/td>\n<\/tr>\n
    2<\/th>\n12<\/td>\n13<\/td>\n14<\/td>\n30<\/td>\n<\/tr>\n
    3<\/th>\n17<\/td>\n18<\/td>\n19<\/td>\n40<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n
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    In\u00a0[9]:<\/div>\n
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    pd.merge(df1,df3, how=\"outer\")<\/pre>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n
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    Out[9]:<\/div>\n
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    \n\n\n\n\n\n\n\n\n\n\n\n\n
    <\/th>\na<\/th>\nb<\/th>\nc<\/th>\nd<\/th>\ne<\/th>\n<\/tr>\n<\/thead>\n
    0<\/th>\n0<\/td>\n1.0<\/td>\n2<\/td>\nNaN<\/td>\nNaN<\/td>\n<\/tr>\n
    1<\/th>\n5<\/td>\n6.0<\/td>\n7<\/td>\nNaN<\/td>\nNaN<\/td>\n<\/tr>\n
    2<\/th>\n10<\/td>\n11.0<\/td>\n12<\/td>\nNaN<\/td>\nNaN<\/td>\n<\/tr>\n
    3<\/th>\n15<\/td>\n16.0<\/td>\n17<\/td>\nNaN<\/td>\nNaN<\/td>\n<\/tr>\n
    4<\/th>\n10<\/td>\nNaN<\/td>\n2<\/td>\n3.0<\/td>\n4.0<\/td>\n<\/tr>\n
    5<\/th>\n20<\/td>\nNaN<\/td>\n7<\/td>\n8.0<\/td>\n9.0<\/td>\n<\/tr>\n
    6<\/th>\n30<\/td>\nNaN<\/td>\n12<\/td>\n13.0<\/td>\n14.0<\/td>\n<\/tr>\n
    7<\/th>\n40<\/td>\nNaN<\/td>\n17<\/td>\n18.0<\/td>\n19.0<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n
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    In\u00a0[10]:<\/div>\n
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    pd.merge(df1,df3, how=\"left\")<\/pre>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n
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    Out[10]:<\/div>\n
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    \n\n\n\n\n\n\n\n\n
    <\/th>\na<\/th>\nb<\/th>\nc<\/th>\nd<\/th>\ne<\/th>\n<\/tr>\n<\/thead>\n
    0<\/th>\n0<\/td>\n1<\/td>\n2<\/td>\nNaN<\/td>\nNaN<\/td>\n<\/tr>\n
    1<\/th>\n5<\/td>\n6<\/td>\n7<\/td>\nNaN<\/td>\nNaN<\/td>\n<\/tr>\n
    2<\/th>\n10<\/td>\n11<\/td>\n12<\/td>\nNaN<\/td>\nNaN<\/td>\n<\/tr>\n
    3<\/th>\n15<\/td>\n16<\/td>\n17<\/td>\nNaN<\/td>\nNaN<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n
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    In\u00a0[11]:<\/div>\n
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    pd.merge(df1,df3, how=\"right\")<\/pre>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n
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    Out[11]:<\/div>\n
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    \n\n\n\n\n\n\n\n\n
    <\/th>\na<\/th>\nb<\/th>\nc<\/th>\nd<\/th>\ne<\/th>\n<\/tr>\n<\/thead>\n
    0<\/th>\n10<\/td>\nNaN<\/td>\n2<\/td>\n3<\/td>\n4<\/td>\n<\/tr>\n
    1<\/th>\n20<\/td>\nNaN<\/td>\n7<\/td>\n8<\/td>\n9<\/td>\n<\/tr>\n
    2<\/th>\n30<\/td>\nNaN<\/td>\n12<\/td>\n13<\/td>\n14<\/td>\n<\/tr>\n
    3<\/th>\n40<\/td>\nNaN<\/td>\n17<\/td>\n18<\/td>\n19<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n
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    In\u00a0[12]:<\/div>\n
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    pd.merge(df2,df3, how=\"outer\")<\/pre>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n
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    Out[12]:<\/div>\n
    \n
    \n\n\n\n\n\n\n\n\n\n\n\n\n
    <\/th>\nc<\/th>\nd<\/th>\ne<\/th>\na<\/th>\n<\/tr>\n<\/thead>\n
    0<\/th>\n2<\/td>\n3<\/td>\n4<\/td>\n0<\/td>\n<\/tr>\n
    1<\/th>\n7<\/td>\n8<\/td>\n9<\/td>\n5<\/td>\n<\/tr>\n
    2<\/th>\n12<\/td>\n13<\/td>\n14<\/td>\n10<\/td>\n<\/tr>\n
    3<\/th>\n17<\/td>\n18<\/td>\n19<\/td>\n15<\/td>\n<\/tr>\n
    4<\/th>\n2<\/td>\n3<\/td>\n4<\/td>\n10<\/td>\n<\/tr>\n
    5<\/th>\n7<\/td>\n8<\/td>\n9<\/td>\n20<\/td>\n<\/tr>\n
    6<\/th>\n12<\/td>\n13<\/td>\n14<\/td>\n30<\/td>\n<\/tr>\n
    7<\/th>\n17<\/td>\n18<\/td>\n19<\/td>\n40<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n
    \u307e\u3068\u3081<\/h2>\n
    \u3053\u306e\u8a18\u4e8b\u3067\u306f2\u3064\u306epandas.DataFrame\u3092\u7d50\u5408\u3059\u308b\u95a2\u6570pd.merge\u3092\u7d39\u4ecb\u3057\u307e\u3057\u305f\u3002\u3053\u306e\u8a18\u4e8b\u3067\u89e3\u8aac\u3057\u305fpd.merge\u306e\u5927\u4e8b\u306a\u3053\u3068\u306f\u4ee5\u4e0b\u306e\u901a\u308a\u3002
    \n
    <\/p>\n
      \n
    • 2\u3064\u306eDataFrame\u3092\u7d50\u5408\u3067\u304d\u308b<\/b><\/li>\n
    • on\u5f15\u6570\u3067\u7d71\u5408\u3059\u308b\u5217\u540d\u3092\uff08\u8907\u6570\uff09\u6307\u5b9a\u3067\u304d\u308b<\/b><\/li>\n
    • how\u5f15\u6570\u3067\u7d50\u5408\u65b9\u6cd5\u3092\u9078\u629e\u3067\u304d\u308b<\/b><\/li>\n<\/ul>\n
      <\/div>
      \n\u3053\u306e3\u3064\u3092\u899a\u3048\u3066\u4f7f\u3044\u3053\u306a\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
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