Modify Maya ASCII file with Python script

The following script modify all files with extension ‘.ma’ in the current project path and subfolders, in this way you can easily edits all files in one shot . This script searching for a specific string replace_this variable and replace it with with_this variable , you can use it for changing references path , texture path etc…

import maya.cmds as cmds
import re
import glob, os

# – Define our search and replace
replace_this ='string you want to replace'
with_this = ""
# - Get your Project path
projectPath=cmds.workspace(q=True, rd=True)
scenesPath= projectPath+"scenes/"
# – Use a regex to do the substitution as that is very quick
regex = re.compile(replace_this)
os.chdir(scenesPath)
for root, dirs, files in os.walk(scenesPath):
    for file in files:
        if file.endswith(".ma"):
             print(root+'/'+file)
             filepath = root+'/'+file
             with open(filepath, "r") as read_stream:
                lines=read_stream.read()
                with open(filepath, "w") as write_stream:
                    write_stream.write(regex.sub(with_this, lines))
print "Job Done..."

Hope this helps!
For any questions do not esitate to contact me!