ping using python and save to a file

This question already has an answer here:

How do you append to a file? 8 answers

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Change both of

fp = open("C:UsersanudeepaDesktophostname.csv", 'w')

to

fp = open("C:UsersanudeepaDesktophostname.csv", 'a')

in order to open the file in append mode.

You can also improve your code by using with , so you don't open the file every iteration:

import os

with open("C:UsersanudeepaDesktophostname.csv", 'a') as fp:
    for i in range (0,255):
        for j in range(1,254):
            hostname = "10.222.{0}.{1}".format(i,j)
            response = os.system ("ping -n 1 " + hostname)
            if response == 0:
                fp.writelines(hostname + "host upn")
            else:
                fp.write(hostname + "host deadn")

This will also have the benefit of closing the file when the script ends.

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