code: def to_int(d, key, default_to_zero=False, default=None, required=True):
      
      value = d.get(key) or default
      if (value in ["", None]) and default_to_zero:
          return 0
      if value is None:
          if required:
              raise ParseError("Unable to read %s from %s" % (key, d))
      else:
          return int(value)
docs: Pull a value from the dict and convert to int
  
      :param default_to_zero: If the value is None or empty, treat it as zero
      :param default: If the value is missing in the dict use this default