[英]How to move data from one dataframe to another based on matching column values with pandas?
[英]How do i move data from one column to another on values that aren't equal in pandas?
我在一个数据框中有两列“名字”和“首选名称”。 如果首选名称与名字不同,我想将该值移动到名字。 例如:
First Name Preferred Name
1 David Dave
2 John John
3 Sarah Sarah
4 Elizabeth Liz
First Name Preferred Name
1 Dave Dave
2 John John
3 Sarah Sarah
4 Liz Liz
有点不耐烦,所以我做了“丑陋”的方式。 查询名称不同的索引的数据,然后将它们添加到这些值上
name_index = df[df['first name'] != df['preferred name']]
df.ix[name_index,'first name'] = df.ix[name_index,'preferred name']
最简单的只是指定为EdChum :
df['first name'] = df['preferred name']
print (df)
first name preferred name
1 Dave Dave
2 John John
3 Sarah Sarah
4 Liz Liz
您可以先创建差异的boolean
掩码,然后按loc
或mask
添加新值:
mask = df['first name'] != df['preferred name']
df.loc[mask, 'first name'] = df['preferred name']
print (df)
first name preferred name
1 Dave Dave
2 John John
3 Sarah Sarah
4 Liz Liz
另一种方案:
mask = df['first name'] != df['preferred name']
df['first name'] = df['first name'].mask(mask,df['preferred name'])
print (df)
first name preferred name
1 Dave Dave
2 John John
3 Sarah Sarah
4 Liz Liz
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