CODEWITHSUNDEEP
python
S. Reich
S. Reich

Reputation: 23

How to I list imported modules with their version?

I need to list all imported modules together with their version. Some of my code only works with specific versions and I want to save the version of the packages, so that I can look it up again in the future. Listing the names of the packages works:

modules = list(set(sys.modules) & set(globals()))
print modules

But if I now want to get the version of the list items it doesn't work with:

for module in modules:
    print module.__version__

Is there a way to address the .__version__ command with a string, or have I to go another way to get the name and the version? In other questions only the names of the modules are addressed: How to list imported modules?

Upvotes: 2

Views: 5799

Answers (2)

cdarke
cdarke

Reputation: 44344

One of the issues I have had with huge legacy programs is where aliases have been used (import thing as stuff). It is also often good to know exactly which file is being loaded. I wrote this module a while ago which might do what you need:

spection.py

"""
Python 2 version
10.1.14
"""
import inspect
import sys
import re

def look():

    for name, val in sys._getframe(1).f_locals.items():
        if inspect.ismodule(val):

            fullnm = str(val)

            if not '(built-in)' in fullnm and \
               not __name__     in fullnm:
                m = re.search(r"'(.+)'.*'(.+)'", fullnm)
                module,path = m.groups()
                print "%-12s maps to %s" % (name, path)
                if hasattr(val, '__version__'):
                    print "version:", val.__version__

Using it:

import sys
import matplotlib
import spection

spection.look()

Gives (on my system):

matplotlib   maps to /System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/matplotlib/__init__.pyc
version: 1.3.1

You will note that I omit builtins like sys and the spection module itself.

Upvotes: 3

wim
wim

Reputation: 362458

Because you have a list of strings of the module name, not the module itself. Try this:

for module_name in modules:
    module = sys.modules[module_name]
    print module_name, getattr(module, '__version__', 'unknown')

Note that not all modules follow the convention of storing the version information in __version__.

Upvotes: 7

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