bpo-39573: Add Py_IS_TYPE macro

[corona10]

https://bugs.python.org/issue39573

[vstinner]

I suggest to modify Argument Clinic in a separated PR, but use this PR to update PyXXX_CheckExact() macros. See: nascheme@c156300

You should credit Neil if you reuse his commit: add Author: Neil Schemenauer <nas-github@arctrix.com> at the end of your commit message.

[codecov]

Codecov Report

Merging #18488 into master will increase coverage by 1.08%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           master   #18488       +/-   ##
===========================================
+ Coverage   82.11%   83.19%    +1.08%     
===========================================
  Files        1956     1571      -385     
  Lines      589145   414668   -174477     
  Branches    44447    44450        +3     
===========================================
- Hits       483801   345002   -138799     
+ Misses      95697    60016    -35681     
- Partials     9647     9650        +3     

Impacted Files	Coverage Δ
Lib/distutils/tests/test_bdist_rpm.py	30.00% <0.00%> (-65.00%)	⬇️
Lib/distutils/command/bdist_rpm.py	7.63% <0.00%> (-56.88%)	⬇️
Lib/test/test_urllib2net.py	76.92% <0.00%> (-13.85%)	⬇️
Lib/test/test_smtpnet.py	78.57% <0.00%> (-7.15%)	⬇️
Lib/ftplib.py	63.85% <0.00%> (-6.06%)	⬇️
Lib/test/test_ftplib.py	87.11% <0.00%> (-4.72%)	⬇️
Tools/scripts/db2pickle.py	17.82% <0.00%> (-3.97%)	⬇️
Tools/scripts/pickle2db.py	16.98% <0.00%> (-3.78%)	⬇️
Lib/test/test_socket.py	71.94% <0.00%> (-3.77%)	⬇️
Lib/test/test_asyncio/test_base_events.py	91.84% <0.00%> (-3.30%)	⬇️
... and 439 more

---

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[corona10]

@vstinner I've updated the PR :)

[corona10]

@vstinner Updated! Thanks for the review

[vstinner]

Ooops, I noticed a typo in one of my previous commit. Would you mind to take this PR as an opportunity to fix it?

https://docs.python.org/dev/c-api/structures.html#c.Py_SET_SIZE

"Set the object o size of size." => "Set ... to size."

[corona10]

Oh sure :)

[vstinner]

Wait, @brandtbucher wrote PR #18496. I will ask him to fix the typo there. You can ignore this special request ;-)

[corona10]

Got it ;-)

[corona10]

Current

Suggestion

Looks like not work as we want ;)

[corona10]

@vstinner Updated :)

[vstinner]

Thanks, merged. You can now redo your Argument Clinic change on top of it.