Python "import comtypes.client" calls pwd.py indirectly -


i have not deep experience in python. working on last application found interesting thing. put script name pwd.py in same directory main script. created pwd.py test basic modules , methods, no more purpose.

but surprised later found main script indirectly calls pwd.py! put debug printouts , found import statement "import comtypes.client" calls pwd.py.

well...i thought standard feature don't know still, but:

  • recursive search in python_home (c:\python343 in case) not show pwd.py in standard python directories. tried recursive search file content inside c:\python343 find calls pwd.py, search returned nothing (i used total commander search ctrl+f7, fails sometimes).

  • google says nothing well-known regarding pwd.py

so, feature , why not described anywhere? kind of vulnerability. 1 can create pwd.py in same directory main script located , put code inside pwd.py...

may check behavior on own system? if works so, can find description of feature?

i found line "import comtypes.client" causes "issue". here content of main script:

#!c:\python343\python import comtypes.client # line causes pwd.py called indirectly !!!

and here content of pwd.py put same directory:

#!c:\python343\python print('pwd.py called!') raise runtimeerror("we got here!") # put exception kevin asked me above, not sure python knows "throw" (it not work me) use "raise"

after got following result:

c:\dev>test.py pwd.py called! traceback (most recent call last):   file "c:\dev\test.py", line 2, in <module>     import comtypes.client # line causes pwd.py called indirectly !!!   file "c:\python343\lib\site-packages\comtypes\client\__init__.py", line 31, in <module>     comtypes.client._code_cache import _find_gen_dir   file "c:\python343\lib\site-packages\comtypes\client\_code_cache.py", line 7, in <module>     import ctypes, logging, os, sys, tempfile, types   file "c:\python343\lib\tempfile.py", line 34, in <module>     import shutil _shutil   file "c:\python343\lib\shutil.py", line 24, in <module>     pwd import getpwnam   file "c:\dev\pwd.py", line 3, in <module>     raise runtimeerror("we got here!") runtimeerror: got here!

so call chain is:

c:\dev\test.py c:\python343\lib\site-packages\comtypes\client\__init__.py c:\python343\lib\site-packages\comtypes\client\_code_cache.py c:\python343\lib\tempfile.py c:\python343\lib\shutil.py c:\dev\pwd.py

and line "from pwd import getpwnam" seems responsible call of pwd.py. after changed main script following way:

#!c:\python343\python import pwd # know it's you!

and really, calls pwd.py! kevin simple idea. remaining question is correct "import pwd" calls pwd.py same directory? interesting feature :-)


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