<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:

def fetch_all(self, R, depth=1, **kwargs):
        "Request multiple objects from API"
        d, e = self._fetcher.fetch_all(R, depth, kwargs)
        if e: raise e
        return d