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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:
 def get_lock_requests(self):
 """Take the current context, and the current patch locks, and determine the effective requests that will be added to the main request. Returns: A dict of (PatchLock, [Requirement]) tuples. Each requirement will be a weak package reference. If there is no current context, an empty dict will be returned. """

        d = defaultdict(list)
        if self._context:
            for variant in self._context.resolved_packages:
                name = variant.name
                version = variant.version
                lock = self.patch_locks.get(name)
                if lock is None:
                    lock = self.default_patch_lock

                request = get_lock_request(name, version, lock)
                if request is not None:
                    d[lock].append(request)
        return d