172 lines
4.5 KiB
Python
172 lines
4.5 KiB
Python
#! /usr/bin/env python
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# -*- coding: utf-8 -*-
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# vim:fenc=utf-8
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#
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# Copyright © 2017 lafrite <lafrite@Poivre>
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#
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# Distributed under terms of the MIT license.
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"""
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Function to create random integer
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"""
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import random
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__all__ = ["reject_random", "filter_random", "FilterRandom"]
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def reject_random(min_value=-10, max_value=10, rejected=[0, 1], accept_callbacks=[]):
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"""Generate a random integer with the rejection method
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:param name: name of the Integer
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:param min_value: minimum value
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:param max_value: maximum value
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:param rejected: rejected values
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:param accept_callbacks: list of function for value rejection
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:example:
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>>> a = reject_random()
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>>> a not in [0, 1]
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True
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>>> a >= -10
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True
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>>> a <= 10
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True
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>>> a = reject_random(min_value=3, max_value=11, rejected=[5, 7])
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>>> a not in [5, 7]
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True
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>>> a >= 3
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True
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>>> a <= 11
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True
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>>> a = reject_random(accept_callbacks=[lambda x: x%2])
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>>> a%2
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1
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>>> random.seed(0)
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>>> reject_random()
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2
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>>> random.seed(1)
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>>> reject_random()
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-6
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"""
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conditions = [lambda x: x not in rejected] + accept_callbacks
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candidate = random.randint(min_value, max_value)
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while not all(c(candidate) for c in conditions):
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candidate = random.randint(min_value, max_value)
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return candidate
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def filter_random(min_value=-10, max_value=10, rejected=[0, 1], accept_callbacks=[]):
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"""Generate a random integer by filtering then choosing a candidate
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:param name: name of the Integer
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:param min_value: minimum value
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:param max_value: maximum value
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:param rejected: rejected values
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:param accept_callbacks: list of function for value rejection
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:example:
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>>> a = filter_random()
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>>> a not in [0, 1]
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True
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>>> a >= -10
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True
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>>> a <= 10
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True
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>>> a = filter_random(min_value=3, max_value=11, rejected=[5, 7])
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>>> a not in [5, 7]
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True
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>>> a >= 3
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True
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>>> a <= 11
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True
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>>> a = filter_random(accept_callbacks=[lambda x: x%2])
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>>> a%2
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1
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>>> random.seed(0)
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>>> filter_random()
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-7
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>>> random.seed(1)
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>>> filter_random()
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6
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"""
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candidates = set(range(min_value, max_value + 1))
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candidates = {c for c in candidates if c not in rejected}
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candidates = [
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candidate
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for candidate in candidates
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if all(c(candidate) for c in accept_callbacks)
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]
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if len(candidates) == 0:
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raise OverflowError(
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"There is no candidates for this range and those conditions"
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)
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return random.choice(candidates)
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class FilterRandom(object):
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"""Integer random generator which filter then choose candidate"""
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# TODO: Faire un cache pour éviter de reconstruire les listes à chaque fois |ven. déc. 21 19:07:42 CET 2018
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def __init__(
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self, rejected=[0, 1], accept_callbacks=[], min_value=-10, max_value=10
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):
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self.conditions = (lambda x: x not in rejected,) + tuple(accept_callbacks)
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self._min = min_value
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self._max = max_value
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candidates = set(range(self._min, self._max + 1))
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self._candidates = {
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candidate
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for candidate in candidates
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if all(c(candidate) for c in self.conditions)
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}
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def add_candidates(self, low, high):
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"""Add candidates between low and high to _candidates"""
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if low < self._min:
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self._min = low
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useless_low = False
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else:
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useless_low = True
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if high > self._max:
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self._max = high
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useless_high = False
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else:
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useless_high = True
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if not (useless_low and useless_high):
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candidates = set(range(low, high + 1))
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self._candidates = self._candidates.union(
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{
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candidate
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for candidate in candidates
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if all(c(candidate) for c in self.conditions)
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}
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)
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def candidates(self, min_value=-10, max_value=10):
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"""Return candidates between min_value and max_value"""
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return [c for c in self._candidates if (c > min_value and c < max_value)]
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def __call__(self, min_value=-10, max_value=10):
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"""Randomly choose on candidate"""
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self.add_candidates(min_value, max_value)
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return random.choice(self.candidates(min_value, max_value))
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# -----------------------------
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# Reglages pour 'vim'
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# vim:set autoindent expandtab tabstop=4 shiftwidth=4:
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# cursor: 16 del
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