pandas.Panel.pipe

Panel.pipe(func, *args, **kwargs)

Apply func(self, *args, **kwargs)

Parameters:

func : function

function to apply to the NDFrame. args, and kwargs are passed into func. Alternatively a (callable, data_keyword) tuple where data_keyword is a string indicating the keyword of callable that expects the NDFrame.

args : iterable, optional

positional arguments passed into func.

kwargs : mapping, optional

a dictionary of keyword arguments passed into func.

Returns:

object : the return type of func.

See also

pandas.DataFrame.apply, pandas.DataFrame.applymap, pandas.Series.map

Notes

Use .pipe when chaining together functions that expect Series, DataFrames or GroupBy objects. Instead of writing

>>> f(g(h(df), arg1=a), arg2=b, arg3=c)

You can write

>>> (df.pipe(h)
...    .pipe(g, arg1=a)
...    .pipe(f, arg2=b, arg3=c)
... )

If you have a function that takes the data as (say) the second argument, pass a tuple indicating which keyword expects the data. For example, suppose f takes its data as arg2:

>>> (df.pipe(h)
...    .pipe(g, arg1=a)
...    .pipe((f, 'arg2'), arg1=a, arg3=c)
...  )