[Python] In Python Pandas DataFrame.apply() method lambda expression is taking apply()...

I have following code

display(ch2m_cpaf.groupby('PROVIDING_COMPANY_CODE').apply(lambda df: df, axis=0))


If I will run it with axis=0 argument, it raises

TypeError: () got an unexpected keyword argument 'axis'
​

But why axis=0 argument is not part of lambda expression?

I tried putting it in parenthesis, it should just return Pandas' Series object

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