Terry J. Reedy <tjre...@udel.edu> added the comment:
2.7 site module has
def abs__file__():
"""Set all module' __file__ attribute to an absolute path"""
for m in sys.modules.values():
if hasattr(m, '__loader__'):
continue # don't mess with a PEP 302-supplied __file__
try:
m.__file__ = os.path.abspath(m.__file__)
except (AttributeError, OSError):
pass
This code assumes that if an object [not coded in python] has read-only
attributes, so that the attempt to write would raise TypeError, then it do not
have .__file__, so there will be an AttributeError, and there will not be a
TypeError to catch. This is true of CPython builtins.
>>> list.__file__
Traceback (most recent call last):
File "<pyshell#2>", line 1, in <module>
list.__file__
AttributeError: type object 'list' has no attribute '__file__'
>>> list.__file__ = ''
Traceback (most recent call last):
File "<pyshell#3>", line 1, in <module>
list.__file__ = ''
TypeError: can't set attributes of built-in/extension type 'list'
On the other hand, C-coded _tkinter has a re-writable .__file__.
>>> import _tkinter
>>> _tkinter.__file__
'C:\\Programs\\Python27\\DLLs\\_tkinter.pyd'
>>> _tkinter.__file__ = ''
>From the minimal information given, it appears that clr defies this
>expectation by having an unwritable .__file__ attribute. Hence the TypeError
>in abs_file. Unless a read_only .__file__ is somewhere documented as
>prohibited, the bug seems to be not including TypeError in the exception tuple.
In 3.x, abs__file__ became abs_paths. It has the same line with the same
problem.
For testing, perhaps an instance of this in sys.modules would work.
class UnsettableFile:
def __getattr__(self, name):
return __file__
def __setattr__(self, name, value):
raise TypeError()
----------
stage: needs patch -> test needed
status: -> open
_______________________________________
Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue31798>
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