New submission from Terry J. Reedy:
The purpose of the function is to create a command line for the user
subprocess. Most of its body:
'''
# Maybe IDLE is installed and is being accessed via sys.path,
# or maybe it's not installed and the idle.py script is being
# run from the IDLE source directory.
del_exitf = idleConf.GetOption('main', 'General', 'delete-exitfunc',
default=False, type='bool')
if __name__ == 'idlelib.PyShell':
command = "__import__('idlelib.run').run.main(%r)" % (del_exitf,)
else:
command = "__import__('run').main(%r)" % (del_exitf,)
return [sys.executable] + w + ["-c", command, str(self.port)]
'''
Question: is it really important to avoid binding the run module to 'run' in
the user process? If so, maybe we should use importlib.import_module, as
'direct use of __import__ is entirely discouraged".
The first command looks 'funny' because of the repetition of 'run'. The reason
is that __import__('idlelib.run') returns idlelib, not idlelib.run. Perhaps it
would work to delete .run in the import, or to use importlib.import_module.
The second command incorrectly assumes that if __name__ == '__main__' (the
alternative to 'idlelib.PyShell'), then the directory containing PyShell and
run is the current working directory. This is true if PyShell is run from that
directory, but
F:\Python\dev\py33\PCbuild>python_d -m idlelib.PyShell
F:\Python\dev\py33\PCbuild>python_d ../Lib/idlelib/PyShell.py
both report "ImportError: No module named 'run'" and open a shell window and
error message box a few seconds later. The shell closes when the messagebox is
dismissed.
It seems to me that the 'else' caters to a non-existent or impossible use case.
PyShell has several 'from idlelib.X import Y' statements. If those work, then
"from idlelib import run' must work, and so too must the function equivalent.
----------
messages: 192053
nosy: roger.serwy, terry.reedy
priority: normal
severity: normal
stage: needs patch
status: open
title: Fix idlelib.PyShell.build_subprocess_arglist use of __import__
type: behavior
versions: Python 2.7, Python 3.3, Python 3.4
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<http://bugs.python.org/issue18330>
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