def incrby(self, name, amount=<NUM_LIT:1>):
with self.pipe as pipe:<EOL><INDENT>return self.core(pipe=pipe).hincrby(<EOL>self.shard(name), name, amount=amount)<EOL><DEDENT>
increment the value for key by value: int

:param name: str     the name of the redis key
:param amount: int
:return: Future()