(clock)
return lambda: collections.defaultdict(lambda: MCache(clock))
Returns a function that makes a defaultdict that makes MCache objects
    for each tenant.
Returns a function that makes a defaultdict that makes MCache objects
    for each tenant.
Returns a function that makes a defaultdict that makes MCache objects for each tenant .
def _mcache_factory(clock):
    """
    Returns a function that makes a defaultdict that makes MCache objects
    for each tenant.
    """
    return lambda: collections.defaultdict(lambda: MCache(clock))
def _mcache_factory ( clock ) : return lambda : collections . defaultdict ( lambda : MCache ( clock ) )