How to use the Python decorator to cache the return value of a function

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Python

Class Memoized (object):

''

Descriptor for population statistical varibles caching.

''

Def _ _ init__ (self, func):

Self.func = func

Self.result = None

Self.fitness = None

Def _ _ get__ (self, instance, cls):

Self.instance = instance

Return self

Def _ _ call__ (self, fitness):

If ((not self.instance._updated) # population not changed

And (self.result is not None) # result already cached

And (fitness = = self.fitness): # fitness not changed

# Return cached result directly.

Return self.result

Else:

# Update fitness function.

Self.fitness = fitness

# Update and memoize result.

Self.result = self.func (self.instance, fitness)

# Recover flag.

Self.instance._updated = False

Return self.result

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