import maya.mel as mel
import maya.cmds as cmds

"""This function check if MR is loaded and load MR if it is not"""
#List all plugins
QueryMR = cmds.pluginInfo( query=True, listPlugins=True )

#We supposed that Mental Ray is not loaded
x=False

#Check if one of the plugin is Mayatomr
for i in QueryMR:
    if i == "MayaMuscle":
        x = True

#if the test above have not MR,load the plugin
if x == False:
    try:
        cmds.loadPlugin('MayaMuscle',quiet=True)
    except:
        print("MayaMuscle may be already loaded")
else:
    print("MayaMuscle may be already loaded")


mel.eval('cMuscleSurfAttachSetup();')