如何在Pandas中用一个值填充一列? [英] How do I fill a column with one value in Pandas?

问题描述

我在Pandas DataFrame中有一列连续的数字.

I have a column with consecutive digits in a Pandas DataFrame.

A
1
2
3
4

我想将所有这些值更改为一个简单的字符串，例如"foo"，结果是

I would like to change all those values to a simple string, say "foo", resulting in

A
foo
foo
foo
foo

推荐答案

只需选择该列并像往常一样分配:

Just select the column and assign like normal:

In [194]:
df['A'] = 'foo'
df

Out[194]:
     A
0  foo
1  foo
2  foo
3  foo

分配标量值会将所有行设置为相同的标量值

Assigning a scalar value will set all the rows to the same scalar value

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