bpo-30871: Add test.pythoninfo (#3174) (#3175)

* bpo-30871: Add test.pythoninfo (#3075)

* Add Lib/test/pythoninfo.py: script collecting various informations
  about Python to help debugging test failures.
* regrtest: remove sys.hash_info and sys.flags from header.
* Travis CI, Appveyor: run pythoninfo before tests
(cherry picked from commit b907abc)

* bpo-30871: pythoninfo: add expat and _decimal (#3121)

* bpo-30871: pythoninfo: add expat and _decimal

* Remove _decimal.__version__

The string is hardcoded, not really interesting.

(cherry picked from commit f6ebd83)

* bpo-30871: Add "make pythoninfo" (#3120)

(cherry picked from commit a3a01a2)

* bpo-30871: pythoninfo: more sys, os, time data (#3130)

* bpo-30871: pythoninfo: more sys, os, time data

PythonInfo now converts types other than intger to string by default.

* fix typo

(cherry picked from commit ad7eaed)

* bpo-31231: Fix pythoninfo in Travis config (#3134)

bpo-31231, bpo-30871: Replace "./python -m test.pythoninfo" with
"make pythoninfo", since macOS uses ./python.exe.
(cherry picked from commit 92b1f90)

(cherry picked from commit 29d007b)

Author: vstinner

.github/appveyor.yml

@@ -7,6 +7,7 @@ branches:
     - buildbot-custom
 build_script:
 - cmd: PCbuild\build.bat -e
+- cmd: PCbuild\python.exe -m test.pythoninfo
 test_script:
 - cmd: PCbuild\rt.bat -q -uall -u-cpu -rwW --slowest -j2
 

.travis.yml

@@ -63,6 +63,7 @@ before_script:
         echo "$changes"
         exit 1
       fi
+      make pythoninfo
 
 script:
   # `-r -w` implicitly provided through `make buildbottest`.