import sys,os
path = “/home/jayapal/Desktop/route/”
fn = ‘/home/jayapal/Desktop/mapping/dem.txt’
target =open(fn, ‘w’)
for filename in os.listdir(path):
         source = open(path + filename, “r”)
         target.write(source.read())
         source.close()
target.close()

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Here fn :Output file
path :Path of folder which contain infinite files