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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:
 async def parse( self, argmap: ArgMap, req: Request = None, locations: typing.Iterable = None, validate: Validate = None, error_status_code: typing.Union[int, None] = None, error_headers: typing.Union[typing.Mapping[str, str], None] = None, ) -> typing.Union[typing.Mapping, None]: """Coroutine variant of `webargs.core.Parser`. Receives the same arguments as `webargs.core.Parser.parse`. """

        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 = core._ensure_list_of_callables(validate)
        schema = self._get_schema(argmap, req)
        try:
            parsed = await self._parse_request(
                schema=schema, req=req, locations=locations or self.locations
            )
            result = schema.load(parsed)
            data = result.data if core.MARSHMALLOW_VERSION_INFO[0] < 3 else result
            self._validate_arguments(data, validators)
        except ma.exceptions.ValidationError as error:
            await self._on_validation_error(
                error, req, schema, error_status_code, error_headers
            )
        return data