dependency resolution pip virtualenv

I have 2 local libraries which are dependent on different version of suds.

Example -

• Module-A-1.0's setup.py has a requirement of suds ==0.3.9.
• Module-B-1.0's setup.py has a requirement of suds ==0.4.0.

Both these modules are required by Module-C, which has the following its setup.py

• django
• Module-A-1.0
• Module-B-1.0

Module-C will be installed in a virtualenv using pip. My question is which version of suds will 开发者_运维问答be installed and can I have both versions installed in the same virtual env?

What I noticed was, whichever module I specified first in the setup.py for Module-C, that version of suds gets installed. So in this case suds 0.3.9. If I switched the modules to

• django
• Module-B-1.0
• Module-A-1.0

The version of suds that gets installed in suds-0.4.0.

Using pip + virtualenv you can't have two versions of a library installed at the same time.

And, unfortunately, I don't know of any good ways of handling this situation. Sorry.