Getting Maya Proxy Attributes

getproxydict.py

from maya import cmds, OpenMaya
from pprint import pprint
import os

def _getProxyAttributeCommands(cmdsnode):
    #Takes a string of a maya object, like 'pshere1'
    #checks for proxy attributes
    #returns mel command to make that proxy attribute
    proxyAttrCmds = []
    selectionList = OpenMaya.MSelectionList()
    try:
        selectionList.add(cmdsnode)
    except:
        return None
    mobj = OpenMaya.MObject()
    selectionList.getDependNode(0,mobj)
    dep = OpenMaya.MFnDependencyNode(mobj)
    for i in range(dep.attributeCount()):
        attr = OpenMaya.MFnAttribute(dep.attribute(i))
        if attr.isProxyAttribute():
            #we have full access to MFnAttribute here
            #example = attr.getAddAttrCmd(True)
            proxyAttrCmds.append(dep.name() + '.' + attr.name())
    return proxyAttrCmds

def repairProxyAttribute(rigpath, animpath, searchname=""):

    cmds.file(rigpath, r=True)

    if not searchname:
        searchname = "_controllers_grp" #change this to be what you're looking for, or set to ""
    controlGrps = [i for i in cmds.ls(type="objectSet", dag=True) if searchName in i]
    proxyAttributes = {}

    for ctrl in controlGrps:
        children = cmds.listRelatives(ctrl, ad=True, pa=True)
        for child in children:
            cmd = _getProxyAttributeCommands(child)
            for c in cmd:
                proxyAttributes[c] = {'inputs' : cmds.listConnections(cmd, scn=True, p=True, source=False, destination=True)}
                proxyAttributes[c] = {'outputs' : cmds.listConnections(cmd, scn=True, p=True, source=True, destination=False)}
                #get the proxies use cmds to see their connections
                #store those values.
    

    
    
    cmds.file(animpath, o=True)
    _connectAttributes(proxyAttributes)

repairProxyAttribute('/path/to/rig.ma', '/path/to/anim.ma', "_controllers_grp" )