importing python

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Old 03 March 2013   #1
Unhappy importing python

I was working on my autoRig and noticed that the code ranged to 1000 some lines and was wondering if it was possible to break it up into different python files. I would like to be able to import the python file and call the functions in that file.
 
Old 03 March 2013   #2
you do it like with any other python program:

* organize your code into modules and packages
* add source path to maya's python path
* import your "main" function into maya and call it there.

More detail explanation could be very long, depending how much of the above you understand.

Debugging is a bit problematic with this, as once a module is imported, python will cache it, unless you specifically ask python to "forget" it. I tend to not rely on "reload()" function as it only reloads one imported module, but not it's dependencies, and that causes a lot of headaches. Instead, I ask python to "forget" the whole package, like this (excerpt from my ngSkinTools dev utils) -calling the below function "unload()". Any subsequent imports from that package will cause python to re-read source files.


DEFAULT_RELOAD_PACKAGES = ['ngSkinTools','ngSkinToolsTest']

def unload(silent=True,packages=None):
    '''
    performs unloading. 
        * silent flag specifies if utility should print the unloaded modules
        * packages: array of packages to unload. specify None to use 
          defaults (DEFAULT_RELOAD_PACKAGES variable)
      
    '''
    
    if packages is None:
        packages = DEFAULT_RELOAD_PACKAGES
        
    # construct reload list
    reloadList =[] 
    for i in sys.modules.keys():
        for package in packages:
            if i.startswith(package):
                reloadList.append(i)


    # unload everything
    for i in reloadList:
        try:
            if sys.modules[i] is not None:
                del(sys.modules[i])
                if not silent:
                    print "unloaded "+i
        except Exception,err:
            #print "failed to unload "+i
            pass
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ngskintools.com - skinning plugin for Autodesk Maya
 
Old 03 March 2013   #3
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