python datetime consistency

[ritchie46]

fixes #4216

[codecov-commenter]

Codecov Report

Merging #4221 (fad4dba) into master (ec4f7e8) will increase coverage by 15.16%.
The diff coverage is 100.00%.

❗ Current head fad4dba differs from pull request most recent head 0494be2. Consider uploading reports for the commit 0494be2 to get more accurate results

@@             Coverage Diff             @@
##           master    #4221       +/-   ##
===========================================
+ Coverage   64.14%   79.30%   +15.16%     
===========================================
  Files         458      459        +1     
  Lines       75650    75951      +301     
===========================================
+ Hits        48522    60232    +11710     
+ Misses      27128    15719    -11409     

Impacted Files	Coverage Δ
py-polars/polars/internals/construction.py	98.06% <100.00%> (-0.31%)	⬇️
py-polars/src/conversion.rs	78.57% <100.00%> (ø)
...olars-lazy/src/physical_plan/expressions/column.rs	63.63% <0.00%> (-10.05%)	⬇️
polars/polars-io/src/parquet/predicates.rs	71.18% <0.00%> (ø)
polars/polars-lazy/src/lib.rs	100.00% <0.00%> (ø)
polars/polars-lazy/src/logical_plan/iterator.rs	98.02% <0.00%> (+0.24%)	⬆️
...olars/polars-core/src/frame/groupby/into_groups.rs	60.47% <0.00%> (+0.29%)	⬆️
polars/polars-io/src/csv/read_impl.rs	80.35% <0.00%> (+0.39%)	⬆️
...polars-lazy/src/physical_plan/expressions/apply.rs	94.18% <0.00%> (+0.58%)	⬆️
... and 206 more

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