我有一个显示年份和月份的多索引数据框;
A B C D E F G H I
2019 8 15.0 15.0 8.0 9.0 18.0 27.0 56.0 21.0 168.0
9 20.0 21.0 11.0 12.0 26.0 37.0 73.0 41.0 241.0
10 25.0 39.0 20.0 19.0 51.0 49.0 133.0 74.0 411.0
11 32.0 65.0 34.0 26.0 110.0 110.0 193.0 147.0 718.0
12 36.0 72.0 38.0 31.0 122.0 152.0 205.0 167.0 821.0
2020 1 42.0 73.0 39.0 35.0 131.0 179.0 205.0 173.0 876.0
2 32.0 71.0 37.0 30.0 113.0 141.0 212.0 151.0 787.0
3 29.0 60.0 32.0 26.0 99.0 120.0 187.0 145.0 700.0
4 20.0 32.0 16.0 17.0 45.0 62.0 108.0 82.0 381.0
5 16.0 28.0 15.0 13.0 37.0 38.0 96.0 71.0 314.0
而且我想在今年剩余时间的末尾附加另一个数据框,该数据框的每一列都有每月值。
A B C D E F G H I
1 41.0 84.0 41.0 37.0 144.0 183.0 221.0 187.0 952.0
2 35.0 80.0 40.0 34.0 131.0 165.0 219.0 174.0 875.0
3 29.0 65.0 32.0 27.0 102.0 123.0 191.0 145.0 701.0
4 20.0 39.0 20.0 18.0 59.0 64.0 137.0 88.0 432.0
5 15.0 26.0 14.0 13.0 40.0 43.0 96.0 55.0 303.0
6 12.0 18.0 9.0 10.0 24.0 35.0 71.0 26.0 200.0
7 12.0 15.0 7.0 9.0 20.0 32.0 58.0 21.0 174.0
8 12.0 16.0 8.0 9.0 18.0 26.0 59.0 21.0 170.0
9 17.0 22.0 11.0 12.0 27.0 37.0 77.0 40.0 240.0
10 23.0 39.0 19.0 19.0 55.0 54.0 120.0 80.0 408.0
11 31.0 63.0 31.0 28.0 110.0 111.0 180.0 137.0 716.0
12 36.0 71.0 36.0 32.0 131.0 168.0 200.0 161.0 858.0
我需要尝试追加数据框,以使用第二个值填充第一个数据框的任何空白月份。
我想有两个问题;-是否需要在第二个数据帧上添加第二个索引才能加入这些索引?-我想我需要做一些'if'陈述,以说仅填充未来的空白月份?
[join / concat / append的很多尝试给了我以下内容;
(2019, 12) 36.0 72.0 38.0 31.0 122.0 152.0 205.0 167.0 821.0
(2020, 1) 42.0 73.0 39.0 35.0 131.0 179.0 205.0 173.0 876.0
(2020, 2) 32.0 71.0 37.0 30.0 113.0 141.0 212.0 151.0 787.0
(2020, 3) 29.0 60.0 32.0 26.0 99.0 120.0 187.0 145.0 700.0
(2020, 4) 20.0 32.0 16.0 17.0 45.0 62.0 108.0 82.0 381.0
(2020, 5) 16.0 28.0 15.0 13.0 37.0 38.0 96.0 71.0 314.0
1 41.0 84.0 41.0 37.0 144.0 183.0 221.0 187.0 952.0
2 35.0 80.0 40.0 34.0 131.0 165.0 219.0 174.0 875.0
3 29.0 65.0 32.0 27.0 102.0 123.0 191.0 145.0 701.0
4 20.0 39.0 20.0 18.0 59.0 64.0 137.0 88.0 432.0
5 15.0 26.0 14.0 13.0 40.0 43.0 96.0 55.0 303.0
6 12.0 18.0 9.0 10.0 24.0 35.0 71.0 26.0 200.0
7 12.0 15.0 7.0 9.0 20.0 32.0 58.0 21.0 174.0
8 12.0 16.0 8.0 9.0 18.0 26.0 59.0 21.0 170.0
9 17.0 22.0 11.0 12.0 27.0 37.0 77.0 40.0 240.0
10 23.0 39.0 19.0 19.0 55.0 54.0 120.0 80.0 408.0
11 31.0 63.0 31.0 28.0 110.0 111.0 180.0 137.0 716.0
12 36.0 71.0 36.0 32.0 131.0 168.0 200.0 161.0 858.0
因此,我需要新的数据框来填充基于月的第一个数据框。
非常感谢任何帮助,似乎无法弄清楚。
DataFrame.combine_first
与DataFrame.combine_first
一起用于第二个DataFrame,其年份值从DataFrame.reindex
起]]]
DataFrame.reindex