删除pandas数据帧中的列

Question

我有以下DataFrame:

                  Date  Year  Month  Day Security Trade  Value
0  2011-01-10 00:00:00  2011      1   10     AAPL   Buy   1500
1  2011-01-13 00:00:00  2011      1   13     AAPL  Sell   1500

当我将其写入csv时,会在文件的开头创建一个额外的列:

,Date,Year,Month,Day,Security,Trade,Value
0,2011-01-10 00:00:00,2011,1,10,AAPL,Buy,1500
1,2011-01-13 00:00:00,2011,1,13,AAPL,Sell,1500

我该如何解决这个问题？

Answer 1

"额外列"是索引.你可以通过传递来抑制它index=None,例如:

>>> df
    A
0  10
1  20
2  30
>>> df.to_csv("out.csv")
>>> !cat out.csv
,A
0,10
1,20
2,30
>>> df.to_csv("out.csv", index=None)
>>> !cat out.csv
A
10
20
30