有条件地将1或0设置为新的Pandas列 [英] Setting 1 or 0 to new Pandas column conditionally

问题描述

一个非常简单的熊猫问题:

A pretty straightforward pandas question:

如果我有这样的数据框:

If I have a dataframe as such:

   hour
 0  0
 1  1
 2  1
 3  2
 4  2
  ...

我想创建一个新的午餐"列，如果11< = hour< = 1则值为1，否则为0，那么什么是最好的且计算最快的方法呢?

and I'd like to create a new column 'lunch' that'll have the value 1 if 11<=hour<=1 and 0 otherwise, what's the best and computationally quickest way to do this?

推荐答案

您可以

In [231]: df['lunch'] = (df['hour']<=11) & (df['hour']<=1)

In [232]: df['lunch']
Out[232]:
0     True
1     True
2     True
3    False
4    False
Name: lunch, dtype: bool

In [233]: df['lunch'].astype(int)
Out[233]:
0    1
1    1
2    1
3    0
4    0
Name: lunch, dtype: int32

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