import os

dictionaryfile = "/root/john.txt"
pgpencryptedfile = "helloworld.txt.gpg"

array = open(dictionaryfile).readlines()


for x in array:
    x = x.rstrip('\n')
    newstring = "echo " + x + " | gpg --passphrase-fd 0 " + pgpencryptedfile
    os.popen(newstring)

I need to create something inside the for loop that will read gpg's output. When gpg outputs this string gpg: WARNING: message was not integrity protected, I need the loop to close and print Success!

How can I do this, and what is the reasoning behind it?

Thanks Everyone!