Updated Cheatsheet with some extra functions added

[ashishbalti4]

-Added a new page

• Added new functions related to IO tools, Data transform and Visualization.
• -Also applied some new functions like df.isin, df.sample, etc.

Pandas_CheatSheet (1).pdf

[phofl]

Could you provide a list what you've changed?

[ashishbalti4]

@phofl I have added a new page with functions like IO tools, Data transform, and visualization.

[datapythonista]

There seems to be things that don't make sense in the new page of the cheatsheet, like df.to_datetime(). See: https://github.com/pandas-dev/pandas/blob/86a11d43cdfd98e2d36bfc184e9c25839e5c633a/Pandas_CheatSheet.pdf

@ashishbalti4, I think it's better if you start by opening an issue to discuss what you want to add to the cheatsheet. There are some good ideas in what you implemented, having a table with the IO functions could be a good addition. But we need to make sure that what we provide is accurate and relevant.