我有這個數據幀:如何創建新列以存儲重複ID列的數據?
ID key
0 1 A
1 1 B
2 2 C
3 3 D
4 3 E
5 3 E
我想創造更多的key
列 - 作爲necessary-到存儲數據的時候有重複IDs
這是輸出的一個片段的key
列:
ID key key2
0 1 A B # Note: ID#1 appeared twice in the dataframe, so the key value "B"
# associated with the duplicate ID will be stored in the new column "key2"
完整的輸出應該像下面這樣:
ID key key2 key3
0 1 A B NaN
1 2 C NaN NaN
2 3 D E E # The ID#3 has repeated three times. The key of
# of the second repeat "E" will be stored under the "key2" column
# and the third repeat "E" will be stored in the new column "key3"
任何建議或想法我應該如何解決這個問題?
感謝,
這是驚人的!是否有可能使代碼處理相同的數據幀,但使用附加列「AltterKey」,因此數據幀總共有3列('ID','key'和'AlterKey')。我應該如何修改代碼才能使其工作? @Alex – MEhsan
我的意思是如何將'lambda'函數應用到新列'AlterKey'? 謝謝,@Alex – MEhsan