python - Using partial with groupby and apply in Pandas -


i having trouble using partial groupby , apply in pandas. perhaps not using right? 

data = {'a':[1,1,2,2],'b':['y','y','n','y'], 'c':['y','y','n','y']} df = pandas.dataframe(data) def county(columnname, group): return len(group[group[columnname] == 'y']) df.groupby('a').apply(partial(county, 'b'))

attributeerror: 'functools.partial' object has no attribute '_module_'

welcome@welcome-thinkcentre-edge72:~$ python python 2.7.3 (default, feb 27 2014, 19:58:35)  [gcc 4.6.3] on linux2 type "help", "copyright", "credits" or "license" more information. >>> import pandas >>> functools import partial >>> data = {'a':[1,1,2,2],'b':['y','y','n','y'], 'c':['y','y','n','y']} >>> df = pandas.dataframe(data) >>> def county(columnname, group): return len(group[group[columnname] == 'y']) ...  >>> df.groupby('a').apply(partial(county, 'b')) traceback (most recent call last):   file "<stdin>", line 1, in <module>   file "/usr/local/lib/python2.7/dist-packages/pandas/core/groupby.py", line 420, in apply     @wraps(func)   file "/usr/lib/python2.7/functools.py", line 33, in update_wrapper     setattr(wrapper, attr, getattr(wrapped, attr)) attributeerror: 'functools.partial' object has no attribute '__module__' >>> pandas.__version__ '0.13.1' >>>

there no need use functools.partial here, can provide arguments function inside apply call.

if function has first argument group (so switch order of arguments), other arguments in apply passed function , in way can specify columnname in apply:

in [10]: def county2(group, columnname):     ...:    return len(group[group[columnname] == 'y'])     ...:   in [11]: df.groupby('a').apply(county2, 'b') out[11]:  1    2 2    1 dtype: int64

the reason not work partial, functools.wraps not seem work functools.partial (wraps used inside apply).


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