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add a decorator that caches function call results in a json file

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master
neingeist 10 years ago
parent 9e142a8cd9
commit f6fe86a220
3 changed files with 325 additions and 65 deletions
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1
.idea/dictionaries/orange.xml
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78
json_memoize.py
Unescape Escape View File

@ -0,0 +1,78 @@
from __future__ import division, print_function
from functools import update_wrapper, wraps
import json
import os
def json_memoize(filename):
"""Return a decorator that memoizes function calls in a JSON file."""
class JsonMemoize:
def __init__(self, fn):
self.fn = fn
update_wrapper(self, fn)
if not os.path.exists(filename):
with open(filename, "w") as f:
json.dump({}, f)
# XXX should work with **kwargs, too.
def __call__(self, *args):
with open(filename, "r") as f:
memo = json.load(f)
if repr(args) not in memo:
memo[repr(args)] = self.fn(*args)
with open(filename, "w") as f:
json.dump(memo, f)
return memo[repr(args)]
return JsonMemoize
def timed(f):
"""Return a timed version of function f.
The returned function returns a tuple of (time, real return value)
:param f: function to time
"""
@wraps(f)
def wrapper(*args, **kwargs):
import time
time_start = time.time()
return_ = f(*args, **kwargs)
time_end = time.time()
time_delta = time_end - time_start
return time_delta, return_
return wrapper
@json_memoize('json_memoize_tmp.json')
def is_prime(n):
"""Really inefficiently check if n is a prime number."""
if n == 0 or n == 1:
return False
for i in xrange(2, n):
if n % i == 0:
return False
return True
assert (is_prime(0) is False)
assert (is_prime(1) is False)
assert (is_prime(2) is True)
assert (is_prime(2 * 3 * 4 * 5 * 6 * 7 * 8 * 9 * 10) is False)
is_prime_timed = timed(is_prime)
for c in range(1, 11):
time, result = is_prime_timed(86028157)
assert (result is True)
print("Call {}: {:.2f}s".format(c, time))
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