depr(python): Deprecate dt.mean/dt.median in favor of mean/median

[mcrumiller]

There is no good reason for these to be a namespace methods. The method on Series/Expr can determine the right result for the data type.

Changes

• Deprecate Series methods dt.mean and dt.median. Users should use Series.mean or Series.median instead.

Example

Before

>>> from datetime import date
>>> s = pl.Series([date(2022, 1, 1), date(2022, 6, 1)])
>>> s.dt.mean()
datetime.datetime(2022, 3, 17, 12, 0)

After

>>> s.mean()
datetime.datetime(2022, 3, 17, 12, 0)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 80.98%. Comparing base (47d19f3) to head (f0b4977).
Report is 12 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #16888      +/-   ##
==========================================
- Coverage   81.41%   80.98%   -0.43%     
==========================================
  Files        1425     1437      +12     
  Lines      187964   189053    +1089     
  Branches     2704     2704              
==========================================
+ Hits       153022   153110      +88     
- Misses      34445    35446    +1001     
  Partials      497      497              

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[stinodego]

Thanks, I left some small comments.

[stinodego]

Thanks for this! Took a while with the reviews to get everything in, but happy we have this one done now 👍

[mcrumiller]

Thanks for the help Stijn!