python满足条件赋值

python满足条件赋值

用列表解析式进行判断：

df["has_comment_or_not"] = ["1" if status != "null" else "0"

for status in df["comment_status"].apply(str)]

具体例子如下：

In [1]: import pandas as pd

In [2]: import numpy as np

In [3]: df = pd.DataFrame(

{"has_comment_or_not":['0','0','0','1','0','0'],

"comment_status":["null","null","120047007","null","null","122121"]}

)

In [4]: df

Out[4]:

has_comment_or_not comment_status

0 0 null

1 0 null

2 0 120047007

3 1 null

4 0 null

5 0 122121

In [5]: df["has_comment_or_not"] = ["1" if status != "null" else "0"

for status in df["comment_status"].apply(str)]