import os
import sys
path = "H:\python\mysql"
for (path,dirs,files) in os.walk(path):
for filename in files:
a = []
a = filename.split('.')[0]
b= a.split('-',1)
newname = b[1] + '-' + b[0] + '.avi'
print (newname)
os.rename(path+"\\"+filename , path+"\\"+newname)
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