py_compile tracebacks with import error

[Alberto Donato]

When using flycheck mode inside emacs, py_compile sometimes tracebacks with the following error:

  File "/usr/lib/python3.8/runpy.py", line 193, in _run_module_as_main
    return _run_code(code, main_globals, None,
  File "/usr/lib/python3.8/runpy.py", line 86, in _run_code
    exec(code, run_globals)
  File "/usr/lib/python3.8/py_compile.py", line 13, in <module>
    import traceback
  File "/usr/lib/python3.8/traceback.py", line 5, in <module>
    import linecache
  File "/usr/lib/python3.8/linecache.py", line 11, in <module>
    import tokenize
  File "/usr/lib/python3.8/tokenize.py", line 32, in <module>
    import re
  File "/usr/lib/python3.8/re.py", line 143, in <module>
    class RegexFlag(enum.IntFlag):
AttributeError: module 'enum' has no attribute 'IntFlag'
Error in sys.excepthook:
Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/apport_python_hook.py", line 53, in apport_excepthook
    if not enabled():
  File "/usr/lib/python3/dist-packages/apport_python_hook.py", line 24, in enabled
    import re
  File "/usr/lib/python3.8/re.py", line 143, in <module>
    class RegexFlag(enum.IntFlag):
AttributeError: module 'enum' has no attribute 'IntFlag'

Original exception was:
Traceback (most recent call last):
  File "/usr/lib/python3.8/runpy.py", line 193, in _run_module_as_main
    return _run_code(code, main_globals, None,
  File "/usr/lib/python3.8/runpy.py", line 86, in _run_code
    exec(code, run_globals)
  File "/usr/lib/python3.8/py_compile.py", line 13, in <module>
    import traceback
  File "/usr/lib/python3.8/traceback.py", line 5, in <module>
    import linecache
  File "/usr/lib/python3.8/linecache.py", line 11, in <module>
    import tokenize
  File "/usr/lib/python3.8/tokenize.py", line 32, in <module>
    import re
  File "/usr/lib/python3.8/re.py", line 143, in <module>
    class RegexFlag(enum.IntFlag):
AttributeError: module 'enum' has no attribute 'IntFlag'

Try installing a more recent version of python-pycompile, and please open a bug report if the issue persists in the latest release. Thanks!

The checker basically calls "python3 -m py_compile <file>"

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: libpython3.8-minimal 3.8.2-1ubuntu1 [modified: usr/lib/python3.8/py_compile.py]
ProcVersionSignature: Ubuntu 5.4.0-24.28-generic 5.4.30
Uname: Linux 5.4.0-24-generic x86_64
NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
ApportVersion: 2.20.11-0ubuntu27
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: GNOME
Date: Tue Apr 21 15:36:48 2020
InstallationDate: Installed on 2019-10-19 (185 days ago)
InstallationMedia: Ubuntu 19.10 "Eoan Ermine" - Release amd64 (20191017)
SourcePackage: python3.8
UpgradeStatus: Upgraded to focal on 2020-03-13 (39 days ago)

[Alberto Donato (ack)]

this seems to be due to a local "enum.py" overriding the global one