how to replace an entire column on Pandas DataFrame

Question

I would like to replace an entire column on a Pandas DataFrame with another column taken from another DataFrame  an example will clarify what I am looking for import pandas as pd dic     A    1  4  1  4    B    9  2  5  3    C    0  0  5  3   df   pd DataFrame dic   df is  A   B   C   1   9   0  4   2   0  1   5   5  4   3   3  Now I have another dataframe called df1 with a column  quot E quot  that is df1  E       4  4  4  0   and I would like to replace column  quot B quot  of df with column  quot E quot  of df1  A   E   C   1   4   0  4   4   0  1   4   5  4   0   3  I tried to use the  replace   method in many ways but I didn t get anything good  Can you help me

User · Answer

If the indices match then   df  B     df1  E     should work otherwise   df  B     df1  E   values   will work so long as the length of the elements matches

User · Answer

If you don t mind getting a new data frame object returned as opposed to updating the original Pandas  assign   will avoid SettingWithCopyWarning  Your example   df   df assign B df1  E

User · Answer

For those that struggle with the  SettingWithCopy  warning  here s a workaround which may not be so efficient  but still gets the job done   Suppose you with to overwrite column 1 and column 3  but retain column 2 and column 4  columns to overwrite     column 1    column 3     First delete the columns that you intend to replace     original df drop labels columns to overwrite  axis  columns   inplace True        then re-insert the columns  but using the values that you intended to overwrite  original df columns to overwrite    other data frame columns to overwrite

[python] how to replace an entire column on Pandas.DataFrame

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