[issue15178] Doctest should handle situations when test files are not readable

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

Doctest still failed with backtrace if argument is a file name.

$ ./python -m doctest aaa.py
Traceback (most recent call last):
  File "/home/serhiy/py/cpython/Lib/runpy.py", line 170, in _run_module_as_main
    "__main__", mod_spec)
  File "/home/serhiy/py/cpython/Lib/runpy.py", line 85, in _run_code
    exec(code, run_globals)
  File "/home/serhiy/py/cpython/Lib/doctest.py", line 2795, in <module>
    sys.exit(_test())
  File "/home/serhiy/py/cpython/Lib/doctest.py", line 2773, in _test
    m = __import__(filename[:-3])
ImportError: No module named 'aaa'

It would be good to have tests.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue15178>
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