remove uses of (ts)?lib.(NaT|iNaT|Timestamp)

[jbrockmendel]

Since they are no longer defined there; instead import then from more appropriate places.

[pep8speaks]

Hello @jbrockmendel! Thanks for submitting the PR.

• There are no PEP8 issues in the file pandas/core/generic.py !

• There are no PEP8 issues in the file pandas/core/indexes/period.py !

• There are no PEP8 issues in the file pandas/tests/dtypes/test_inference.py !

• There are no PEP8 issues in the file pandas/tests/frame/test_constructors.py !

• There are no PEP8 issues in the file pandas/tests/indexes/datetimes/test_tools.py !

• There are no PEP8 issues in the file pandas/tests/indexes/period/test_ops.py !

• There are no PEP8 issues in the file pandas/tests/scalar/period/test_period.py !

• There are no PEP8 issues in the file pandas/tests/series/indexing/test_datetime.py !

• There are no PEP8 issues in the file pandas/tests/series/test_dtypes.py !

• There are no PEP8 issues in the file pandas/tests/series/test_internals.py !

• There are no PEP8 issues in the file pandas/tests/series/test_replace.py !

• There are no PEP8 issues in the file pandas/tests/tslibs/test_array_to_datetime.py !

[codecov]

Codecov Report

Merging #23562 into master will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##           master   #23562   +/-   ##
=======================================
  Coverage   92.24%   92.24%           
=======================================
  Files         161      161           
  Lines       51224    51224           
=======================================
  Hits        47254    47254           
  Misses       3970     3970

Flag	Coverage Δ
#multiple	90.63% <100%> (ø)	⬆️
#single	42.28% <57.14%> (ø)	⬆️

Impacted Files	Coverage Δ
pandas/core/generic.py	96.81% <100%> (ø)	⬆️
pandas/core/indexes/period.py	92.25% <100%> (ø)	⬆️

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[gfyoung]

Nice regex-ish title as well. 🙂

cc @jreback

[jreback]

thanks!