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Commit b438e009 authored by Dahmane Lynda's avatar Dahmane Lynda
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Tp3

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#!/usr/bin/python3
# -*- coding: utf-8 -*-
"""
:module: ap_decorators
:author: FIL - Faculté des Sciences et Technologies - Univ. Lille <http://portail.fil.univ-lille1.fr>_
:date: 2018, september
"""
from functools import wraps
def trace(fct):
'''
Decorator for tracing every call to fct.
Recursive calls are indented.
:Example:
>>> @trace
... def fact(n):
... if n == 0:
... return 1
... else:
... return n * fact(n - 1)
>>> fact(5)
-> fact((5,), {})
... -> fact((4,), {})
...... -> fact((3,), {})
......... -> fact((2,), {})
............ -> fact((1,), {})
............... -> fact((0,), {})
............... <- 1
............ <- 1
......... <- 2
...... <- 6
... <- 24
<- 120
120
'''
@wraps(fct)
def wrapper(*args, **kwargs):
dots = '...' * wrapper.__depth
print('{:s} -> {:s}{:s}'.format(dots, wrapper.__name__, repr((args, kwargs))))
wrapper.__depth += 1
y = fct(*args, **kwargs)
wrapper.__depth -= 1
print('{:s} <- {:s}'.format(dots, repr(y)))
return y
wrapper.__depth = 0
return wrapper
def count(fct):
'''
decorator for counting calls to function fct
:Example:
>>> @count
... def fact(n):
... if n == 0:
... return 1
... else:
... return n * fact(n - 1)
>>> fact.counter
0
>>> fact(5)
120
>>> fact.counter
6
'''
@wraps(fct)
def wrapper(*args, **kwargs):
y = fct(*args, **kwargs)
wrapper.counter += 1
return y
wrapper.counter = 0
return wrapper
def memoize(fct):
'''
decorator for memoizing computed values of function fct
:Example:
>>> @count
... @memoize
... def fact(n):
... if n == 0:
... return 1
... else:
... return n * fact(n - 1)
>>> fact.counter
0
>>> fact(5)
120
>>> fact.counter
6
>>> fact.counter = 0
>>> fact(5)
120
>>> fact.counter
1
'''
cache = dict()
@wraps(fct)
def wrapper(*args, **kwargs):
key = repr((args, kwargs))
if key in cache:
return cache[key]
else:
y = fct(*args, **kwargs)
cache[key] = y
return y
return wrapper
if __name__ == '__main__':
import doctest
doctest.testmod(optionflags=doctest.NORMALIZE_WHITESPACE | doctest.ELLIPSIS, verbose=False)
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