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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 PyParseIntCast(string, location, tokens):
 """Return an integer from a string. This is a pyparsing callback method that converts the matched string into an integer. The method modifies the content of the tokens list and converts them all to an integer value. Args: string (str):
 original string. location (int):
 location in the string where the match was made. tokens (list[str]):
 extracted tokens, where the string to be converted is stored. """

  # Cast the regular tokens.
  for index, token in enumerate(tokens):
    try:
      tokens[index] = int(token)
    except ValueError:
      logger.error('Unable to cast [{0:s}] to an int, setting to 0'.format(
          token))
      tokens[index] = 0

  # We also need to cast the dictionary built tokens.
  for key in tokens.keys():
    try:
      tokens[key] = int(tokens[key], 10)
    except ValueError:
      logger.error(
          'Unable to cast [{0:s} = {1:d}] to an int, setting to 0'.format(
              key, tokens[key]))
      tokens[key] = 0