Polars direct integration

[marcozanotti]

Hi,

I am used to work with the timetk package in R, so for a python project I am trying out pytimetk.
However, I would expect pytimetk functions to work with polars objects, not only with pandas objects.
I see that there is a backend option that allows to perform operations with polars, but, as far as I understand, it

• converts pandas objects to polars

• applies some functions with polars

• transforms back the polars objects to pandas

It would be beneficial to have pytimetk work with both data objects directly, as it is in Nixtla's libraries for instance, with something like

if isinstance(df, pd.DataFrame):
... pandas backend
else:
... polars backend

BTW thanks for all your work.