python - Apply function to column in pandas dataframe that takes two arguments -


say have mapping:

mapping = {     'cat': 'purrfect',     'dog': 'too work',     'fish': 'meh'     }

and dataframe: 

    animal  name       description 0   cat     sparkles   nan 1   dog     rufus      nan 2   fish    mr. blub   nan

i programmatically fill in description column using animal column , mapping dict inputs:

def describe_pet(animal,mapping):     return mapping[animal]

when try use pandas apply() function:

df['description'].apply(describe_pet,args=(df['animal'],mapping))

i following error:

typeerror: describe_pet() takes 2 arguments (3 given)

it seems using apply() trivial passing 1 argument function. how can 2 arguments?

the suggested answer solves specific problem, more generic case:

the args parameter parameters in addition columns:

args : tuple positional arguments pass function in addition array/series

pandas.dataframe.apply


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