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[英]Unable to make a new column in Pandas dataframe from two existing columns
[英]Pandas : make a new column from existing column that ends with character
这应该有效:
df['state'] = df.loc[df['YourCol'].str.endswith('[edit]'), 'YourCol']
只需更换YourCol
与您正在使用的列, df
与您的姓名dataframe
。 请注意,在不以[edit]
结尾的地方,您将获得NaN
值。
我认为您试图将“[edit]”行不仅仅是作为一个单独的列使用,而是将它们映射到它们下面的学校,这样您最终会得到这样的结果:
School State
Fairbanks (University of Alaska Fairbanks)[2] Alaska
Flagstaff (Northern Arizona University) Arizona
Tempe (Arizona State University) Arizona
Tucson (University of Arizona) Arizona
Arkadelphia (Henderson State University, ...) Arkansas
如果是这种情况,您可以将 Nicolas Gervais 的答案与 pandas 的fillna
:
df['State'] = df[df['YourCol'].str.endswith('[edit]')]['YourCol']
df['State'] = df['State'].fillna(method='ffill') # Forward-fills the states
df = df.drop(df[df['YourCol'].str.endswith('[edit]')]) # Drop the "header" rows
df['State'] = df['State'].str.slice_replace(start=-6) # Remove "[edit]" from the end of the state names
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