Running a Python module via runpy will sometimes not show any traceback.
For example, if the module raises an AttributeError, then the result would be this;
$ echo 'import random; random.dsgjdgj' > hello/__init__.py
$ python -m hello
/bin/python: Error while finding spec for 'hello.__main__'
(<class 'AttributeError'>: 'module' object has no attribute 'dsgjdgj');
'hello' is a package and cannot be directly executed
However if you cause an NameError, the traceback will show correctly;
$ echo 'lalalalal' > hello/__init__.py
$ python -m hello
Traceback (most recent call last):
File "/usr/lib/python3.4/runpy.py", line 151, in _run_module_as_main
mod_name, mod_spec, code = _get_module_details(mod_name)
File "/usr/lib/python3.4/runpy.py", line 118, in _get_module_details
return _get_module_details(pkg_main_name)
File "/usr/lib/python3.4/runpy.py", line 104, in _get_module_details
spec = importlib.util.find_spec(mod_name)
File "/usr/lib/python3.4/importlib/util.py", line 86, in find_spec
parent = __import__(parent_name, fromlist=['__path__'])
File "/vagrant/server/hello/__init__.py", line 1, in <module>
lalalalal
NameError: name 'lalalalal' is not defined
I'd like to show a full traceback, regardless of what the error is. I've tried several CLI options, including -v -d with no impact.
It seems to be related to this cpython/Lib/runpy.py:
try:
spec = importlib.util.find_spec(mod_name)
except (ImportError, AttributeError, TypeError, ValueError) as ex:
# This hack fixes an impedance mismatch between pkgutil and
# importlib, where the latter raises other errors for cases where
# pkgutil previously raised ImportError
msg = "Error while finding spec for {!r} ({}: {})"
raise ImportError(msg.format(mod_name, type(ex), ex)) from ex
From what I can tell, from ex should ensure that the original traceback is kept in tact and printed via stdout at some stage.
It would appear the source of the problem is;
except ImportError as exc:
# Try to provide a good error message
# for directories, zip files and the -m switch
if alter_argv:
# For -m switch, just display the exception
info = str(exc)
Any ideas?
