Passing multiple parameters with apply in Pandas

Question

How do I pass multiple parameters with apply in Pandas?

do_something is a function:

def do_something(x,test="testFoo")

This can be used with dataframe.apply

df2.apply(do_something, test="testBar",axis=1)

I want to pass another parameter (df) like this:

def do_something(x,test="testFoo",df)

How do I now call apply with this df parameter similar to this:

df2.apply(do_something, test="testBar",df=df,axis=1)

jezrael · Accepted Answer · 2021-03-29 09:14:48Z

1

For me working small change df=df in def:

df = pd.DataFrame({'a':[1,2]})
df2 = pd.DataFrame({'g':[50,40]})

def do_something(x,test="testFoo",df=df):
    print (df)
       a
    0  1
    1  2
       a
    0  1
    1  2

df2.apply(do_something, test="testBar",df=df,axis=1)

EDIT:

df2 = pd.DataFrame({'g':[50,40]})

def get_df():
    return pd.DataFrame({'a':[1,2]})

def do_something(x,df,test="testFoo"):
    print (df)

df2.apply(do_something, test="testBar",df=get_df(),axis=1)

edited Mar 29, 2021 at 9:14

answered Mar 29, 2021 at 8:57

jezrael

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2 Comments

nipy Over a year ago

I tried this and get NameError: name 'df' is not defined. I'm importing the function from another module.

jezrael Over a year ago

@ade1e - I try edit question, important is order do_something(x,df,test="testFoo")

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