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import os
import os.path
rootdir='d:\SocketTest'
for path, dirnames, filenames in os.walk(rootdir):
for filename in filenames:
portion = os.path.splitext(filename)
if portion[1] == '.txt':
newname = portion[0]+'.csv'
os.rename(os.path.join(path,filename),os.path.join(path,newname))