使用if语句在python中替换字符串
问题描述：
尝试根据列值替换字符串，但出现错误 ValueError:系列的真值不明确.使用a.empty，a.bool()，a.item()，a.any()或a.all().
Trying to replace a string based on column value, getting the error ValueError: The truth value of a Series is ambiguous. Use a.empty, a.bool(), a.item(), a.any() or a.all().
if df['Target'] == 'U':
df['Target'] = df['Action']
获取错误 ValueError:系列的真值不明确.使用a.empty，a.bool()，a.item()，a.any()或a.all().
Getting the Error ValueError: The truth value of a Series is ambiguous. Use a.empty, a.bool(), a.item(), a.any() or a.all().
我需要检查字符串，如果匹配则用另一个列值替换
Just I need to check the string and replace it with another column value if matches
答
使用np.where
例如:
import numpy as np
df['Target'] = np.where(df['Target'] == "U", df['Action'], df['Target'])