[WIP] bpo-39725: Suppress only handled exception by "raise ... from ...".

[serhiy-storchaka]

https://bugs.python.org/issue39725

[pganssle]

@serhiy-storchaka Are you sure you got the bpo issue right? Looks unrelated to me.

[serhiy-storchaka]

You are right. I copied it from a wrong issue.

[codecov[bot]]

Codecov Report

Merging #18629 into master will increase coverage by 0.00%. The diff coverage is n/a.

@@           Coverage Diff            @@
##           master   #18629    +/-   ##
========================================
  Coverage   82.06%   82.07%            
========================================
  Files        1955     1955            
  Lines      584068   584254   +186     
  Branches    44458    44460     +2     
========================================
+ Hits       479334   479525   +191     
+ Misses      95110    95103     -7     
- Partials     9624     9626     +2     

Impacted Files	Coverage Δ
Lib/idlelib/colorizer.py	85.78% <0.00%> (-1.02%)	:arrow_down:
Lib/_weakrefset.py	59.18% <0.00%> (-0.69%)	:arrow_down:
Modules/_struct.c	89.13% <0.00%> (-0.44%)	:arrow_down:
Lib/test/test_random.py	96.78% <0.00%> (-0.31%)	:arrow_down:
Lib/random.py	88.12% <0.00%> (-0.28%)	:arrow_down:
Modules/clinic/mathmodule.c.h	85.58% <0.00%> (-0.13%)	:arrow_down:
Objects/abstract.c	75.87% <0.00%> (ø)	:arrow_up:
Lib/test/test_math.py	94.84% <0.00%> (+0.01%)	:arrow_up:
Modules/socketmodule.c	75.78% <0.00%> (+0.08%)	:arrow_up:
Lib/test/test_isinstance.py	98.15% <0.00%> (+0.14%)	:arrow_up:
... and 6 more

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