76 lines
2.0 KiB
Python
76 lines
2.0 KiB
Python
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#!/usr/bin/env python
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# encoding: utf-8
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from random import randint
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import re
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class RdExpression(object):
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"""A generator of random expression builder"""
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def __init__(self, form, conditions = []):
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"""Initiate the generator
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:param form: the form of the expression (/!\ variables need to be in brackets {})
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:param conditions: condition on variables (/!\ variables need to be in brackets {})
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"""
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self._form = form
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self._conditions = conditions
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self._letters = self.get_letters()
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self._gene_varia = {}
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def get_letters(self):
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"""Find letters in the form
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:returns: list of letters
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"""
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pattern = "\{(\w+)\}"
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varia = re.findall(pattern, self._form)
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print(varia)
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return list(set(varia))
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def __call__(self, val_min = -10, val_max = 10):
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"""RdExpression once it is initiate act like a function which create random expressions.
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:param val_min: minimum value random generation
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:param val_max: maximum value random generation
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:returns: an random expression
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"""
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self.gene_varia(val_min, val_max)
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while not(self.val_conditions()):
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self.gene_varia(val_min, val_max)
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return self._form.format(**self._gene_varia)
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def gene_varia(self, val_min = -10, val_max = 10):
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"""RAndomly generates variables/letters
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"""
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for l in self._letters:
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self._gene_varia[l] = randint(val_min, val_max)
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def val_conditions(self):
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"""Tells whether or not conditions are validates
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:returns: boolean
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"""
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return eval(" and ".join(self._conditions).format(**self._gene_varia))
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if __name__ == '__main__':
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form = "{a}x + 2*{b}"
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cond = ["{a} + {b} in [1, 2, 3, 4, 5]"]
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rdExp1 = RdExpression(form, cond)
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print(rdExp1())
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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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