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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def GetValidHostsForCert(cert):
 """Returns a list of valid host globs for an SSL certificate. Args: cert: A dictionary representing an SSL certificate. Returns: list: A list of valid host globs. """

  if 'subjectAltName' in cert:
    return [x[1] for x in cert['subjectAltName'] if x[0].lower() == 'dns']
  else:
    return [x[0][1] for x in cert['subject']
            if x[0][0].lower() == 'commonname']