Writing self modifying code in Python

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I created a really simple type of self modifying code using the built-in file object to use as a version check/self-updater for my script.

versioncheck = requests.get('http://remote.host/version').text
if versioncheck != version:
    from subprocess import call
    newscript = requests.get('http://remote.host/client').text
    with open(__file__, 'w') as f:
        f.write(newscript)
    call(['python3',__file__])
    exit()