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ENH: add errors='raise' option to rename

See original GitHub issue

Is there a reason that .rename doesn’t raise if keys are supplied that don’t exist? This caught me out a couple of times:

In [14]: import pandas as pd

In [15]: df=pd.DataFrame({'a': [1,2], 'b': [3,4]})

In [16]: df
Out[16]: 
   a  b
0  1  3
1  2  4

In [17]: df.rename(columns={'a': 'c'})
Out[17]: 
   c  b
0  1  3
1  2  4
# ok

In [18]: df.rename(columns={'d': 'c'})
Out[18]: 
   a  b
0  1  3
1  2  4

# this should raise?

Issue Analytics

State:
Created 7 years ago
Comments:10 (7 by maintainers)

Top GitHub Comments

1reaction

ghostcommented, Dec 7, 2018

Is there a particular reason why the default value would be “ignore” for rename? If I’m renaming keys in a mapping but one isn’t there, I normally anticipate a KeyError. A deprecation period would be necessary, of course – I think a similar change has occurred recently with missing columns for loc.

0reactions

bala-analyticscommented, Jun 17, 2020

Thanks. Sorry missed that errors = ‘raise’ option

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