code: def parse(
          self,
          argmap,
          req=None,
          locations=None,
          validate=None,
          error_status_code=None,
          error_headers=None,
      ):
          
          self.clear_cache()  # in case someone used `parse_*()`
          req = req if req is not None else self.get_default_request()
          assert req is not None, "Must pass req object"
          data = None
          validators = _ensure_list_of_callables(validate)
          parser = self._clone()
          schema = self._get_schema(argmap, req)
          try:
              parsed = parser._parse_request(
                  schema=schema, req=req, locations=locations or self.locations
              )
              result = schema.load(parsed)
              data = result.data if MARSHMALLOW_VERSION_INFO[0] < 3 else result
              parser._validate_arguments(data, validators)
          except ma.exceptions.ValidationError as error:
              parser._on_validation_error(
                  error, req, schema, error_status_code, error_headers
              )
          return data
docs: Main request parsing method.
  
          :param argmap: Either a `marshmallow.Schema`, a `dict`
              of argname -> `marshmallow.fields.Field` pairs, or a callable
              which accepts a request and returns a `marshmallow.Schema`.
          :param req: The request object to parse.
          :param tuple locations: Where on the request to search for values.
              Can include one or more of ``('json', 'querystring', 'form',
              'headers', 'cookies', 'files')``.
          :param callable validate: Validation function or list of validation functions
              that receives the dictionary of parsed arguments. Validator either returns a
              boolean or raises a :exc:`ValidationError`.
          :param int error_status_code: Status code passed to error handler functions when
              a `ValidationError` is raised.
          :param dict error_headers: Headers passed to error handler functions when a
              a `ValidationError` is raised.
  
           :return: A dictionary of parsed arguments