创建名为"Id"的列基于行索引 [英] Create column named "Id" based on row index

问题描述

我想为名为"Id"的数据框创建一个新列，其中值是行索引+1. 我想像下面的例子:

I would like to create a new column for my dataframe named "Id" where the value is the row index +1. I would like to be like the example below:

   ID  Col1  ...
0  1   a     ...
1  2   b     ...
2  3   c     ...

推荐答案

您可以在索引中添加一个并将其分配给id列:

You can add one to the index and assign it to the id column:

df = pd.DataFrame({"Col1": list("abc")})

df["id"] = df.index + 1

df
#Col1   id
#0  a    1
#1  b    2
#2  c    3

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