The scattr Python package
The scattr package has one function, scattr,
that provides an easy way to
Set Class ATTRibutes of classes derived
from pre-existing Python classes.
The scattr function takes
- a class object and
- the name of a helper script
and returns a subclass called
SubClassAttributesthat contains the methods defined in the helper script.
Essentially, this is an easy way to add user-defined functions to classes.
Pandas DataFrame example
import pandas as pd
from scattr import scattr
# create a new class that inherits from pd.DataFrame
# and includes methods defined in a 'helper.py' file
ScattrFrame = scattr(cls=pd.DataFrame, src='helper')
# instantiate the new class
df = ScattrFrame(data=pd.read_csv('risk_factors_cervical_cancer.csv'))
# test methods added from helper file
df.say_hi()
df.say_moo()
# test method from parent class
df.head(n=1)
# confirm that df is an instance of pd.DataFrame and PydyFrame
isinstance(df, (pd.DataFrame, ScattrFrame))
# confirm that ScattrFrame is a subclass of pd.DataFrame
issubclass(ScattrFrame, pd.DataFrame)
