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Objects that represent potential behavior (functions and methods) can be invoked, or called. We can test an object's callability with the callable() function:

try: import psyco psyco.full() except ImportError: pass

>>> def simple_cache(fn): ... cache = {} ... ... def new_fn(n): ... if n in cache: ... print 'FOUND IN CACHE; RETURNING' ... return cache[n] ... ... # otherwise, call function & record value ... val = fn(n) ... cache[n] = val ... return val ... ... return new_fn