[Python-Dev] Failures in test_site.py - how to debug? (original) (raw)

Terry Reedy tjreedy at udel.edu
Fri Aug 19 12:38:45 EDT 2016

On 8/19/2016 10:13 AM, Chris Angelico wrote:

On my main dev system (Debian Stretch), I've had a single long-standing test failure - testsite.py, StartupImportTests.teststartupimports. It's annoying (partly because it's such a noisy failure), and doesn't appear to be happening on the buildbots, nor presumably on core devs' computers, so it's probably not a Python bug. How can I go about figuring out what's actually going on here?

The test effectively runs this (but with -v, which makes it noisy): $ ./python -I -c 'import sys; print(set(sys.modules))' {'frozenimportlibexternal', 'keyword', 'stat', 'weakref', 'sysconfig', 'genericpath', 'sysconfigdatam', 'io', 'operator', 'bootlocale', 'encodings.utf8', 'itertools', 'locale', 'codecs', 'weakrefset', 'operator', 'frozenimportlib', 'types', 'sitebuiltins', 'os', 'posixpath', 'functools', 'main', 'weakref', 'warnings', 'codecs', 'builtins', 'posix', 'functools', 'io', 'encodings.aliases', 'collections.abc', 'encodings', 'thread', 'collections', 'errno', 'collections', 'collectionsabc', 'heapq', 'imp', 'site', 'sys', 'reprlib', 'signal', 'stat', 'zipimport', 'abc', 'encodings.latin1', 'os.path', 'marshal', 'heapq', 'mpltoolkits'}

Sorted() gives an easier to compare listing ;-). On Windows as of 2 days ago (using required " insteadof ') many fewer:

F:\Python\dev>36\pcbuild\win32\python_d.exe -I -c "import sys; print(sorted(sys.modules))" ['main', '_bootlocale', '_codecs', '_collections_abc', '_frozen_importlib', '_frozen_importlib_external', '_imp', '_io', '_locale', '_signal', '_sitebuiltins', '_stat', '_thread', '_warnings', '_weakref', '_weakrefset', 'abc', 'builtins', 'codecs', 'encodings', 'encodings.aliases', 'encodings.cp1252', 'encodings.cp437', 'encodings.latin_1', 'encodings.mbcs', 'encodings.utf_8', 'errno', 'genericpath', 'io', 'marshal', 'nt', 'ntpath', 'os', 'os.path', 'site', 'stat', 'sys', 'sysconfig', 'winreg', 'zipimport']

test_site passes, so _collections_abc is not a problem

-- Terry Jan Reedy

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