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Function decorator for caching function results in local memory

Author:
bikeshedder
Posted:
September 24, 2012
Language:
Python
Version:
Not specified
Tags:
cache decorator local memory
Score:
0 (after 0 ratings)
@cache(60)
def heavy_computation():
   for x in xrange(10000000):
       pass # just waste some time`

The result of heavy_computation calls will be cached for 60 seconds. This cache decorator does not use the Django cache backend and uses the local memory instead.

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from time import time

class cache(object):
    def __init__(self, seconds):
        self.seconds = seconds
        self.value = None
        self.timestamp = None
    def __call__(self, f):
        def cached():
            now = time()
            if now - self.seconds > self.timestamp:
                self.value = f()
                self.timestamp = now
            return self.value
        return cached

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