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[英]How do I add the value from one dataframe based on a column to another dataframe based on a row?
[英]In Python, how do I change one column of a dataframe based on another?
在具有x和y列的 dataframe 中,我将如何编写代码以便如果一行有一个x字符串但一个“未分配” y字符串( y列包含字符串“未分配”),那么y字符串将是和x字符串一样吗?
(用列x的内容覆盖列y中的“未分配”字符串)
您可以在迭代时使用df.iterrows()
有条件地检查列的值。
import pandas as pd
df = pd.DataFrame(data={'x': [1,2,3], 'y': [6, "Not Assigned", 8]})
for index, value in df.iterrows():
if value['y'] == 'Not Assigned':
df['y'][index] = df['x'][index]
Output:
x y
0 1 6
1 2 2
2 3 8
df.loc[df['y']=='Not assigned', 'y'] = df.loc[df['y']=='Not assigned', 'x']
会做的
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