Fails with no trivial structure

[nathanielobrown]

I am trying to use this example for some production code and can not seem to get it to work in anything but simple examples. Instead I get an endless stream of errors like:

<type 'exceptions.TypeError'>
---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
TypeError: must be string or None, not list

This ends after a period of time in python crashing or it will just stop on one of the TypeErrors. I suspect it has to do with an improper handling of some package structure or import method.

I know this is a little vague, but do you have any intuition about what might be going wrong that might point me in the right direction? Any loose ends in CryptImpHook_load_module? I am on Windows 7 with python 2.7.10 compiling with Microsoft Visual C++ 2008 for Python.

[neurogeek]

Hi @nbrown14
This is pretty old code, but I can try to reproduce and report back.

What Python code is giving you this error? Is this in the encryption part or the decryption part?

[nathanielobrown]

Really it is just the import part. I tried changing things so that no encryption was performed and only the file extension was changed and still found the same behavior. I also had to make a few tweaks to get things to work on windows.

I have determined that the issue has to do with importing regular installed packages. It appears that just adding the import hook causes some problems. My findings are:

• Standard library modules import fine. Example:

  import sys
  from CryptImpHook import CryptImpHook
  sys.meta_path.append(CryptImpHook())
  import re
  

• Standard library packages seem to work after a few TyperErrors. Example threw 8 TypeErrors but then worked

  import sys
  from CryptImpHook import CryptImpHook
  sys.meta_path.append(CryptImpHook())
  import json
  

• Site-packages modules throw several TypeErrors but then import properly. Example threw 15 TypeErrors and then worked

  import sys
  from CryptImpHook import CryptImpHook
  sys.meta_path.append(CryptImpHook())
  import xmltodict
  

• Site-packages packages throw TypeErrors until python crashes in some cases. Importing beautifulsoup (import bs4) fails, import requests succeeds after a large number of TypeErrors

  import sys
  from CryptImpHook import CryptImpHook
  sys.meta_path.append(CryptImpHook())
  import xmltodict
  
  import sys
  from CryptImpHook import CryptImpHook
  sys.meta_path.append(CryptImpHook())
  import xmltodict
  

• Importing modules ending in pye works fine, packages containing pye files do not (I am not too concerned about this)

• I reproduced this behavior on Ubuntu 14.04.2 running Python 2.7.10 and using an unmodified version of your code.

I really appreciate that you responded to my issue. My C is weak and the Python C API scares me, but I might be able to figure this out with a few pointers (pun intended).