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Random_expression accept calc in conditions

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Lafrite 2014-02-28 13:17:12 +01:00
parent bdad59ef8a
commit 193b050a09
1 changed files with 33 additions and 16 deletions
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49
pymath/random_expression.py
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@ -6,6 +6,8 @@ from .expression import Expression
from .renders import tex_render, txt_render
import re
from .arithmetic import gcd
class RdExpression(object):
"""A generator of random expression builder"""
@ -30,11 +32,17 @@ class RdExpression(object):
"""
pattern = "\{(.*?)\}" #select inside {} non greedy way
varia = re.findall(pattern, self._form)
varia = set(varia)
self._2replaced = varia
return varia
varia_form = re.findall(pattern, self._form)
varia_form = set(varia_form)
varia_cond = set()
for c in self._conditions:
varia_cond = varia_cond | set(re.findall(pattern, c))
self._2replaced = varia_cond | varia_form
return self._2replaced
def get_letters(self):
"""Find letters in the form
@ -96,7 +104,9 @@ class RdExpression(object):
return Expression(exp)
def gene_varia(self, val_min = -10, val_max = 10):
"""RAndomly generates variables/letters
"""Randomly generates variables/letters
Varia can't be equal to 0
"""
for l in self._letters:
@ -104,6 +114,7 @@ class RdExpression(object):
while self._gene_varia[l] == 0:
self._gene_varia[l] = randint(val_min, val_max)
for e in self._2replaced:
self._gene_2replaced[e] = eval(e, globals(), self._gene_varia)
@ -113,7 +124,7 @@ class RdExpression(object):
"""
if self._conditions != []:
return eval(" and ".join(self._conditions).format(**self._gene_varia))
return eval(" and ".join(self._conditions).format(**self._gene_2replaced))
else:
return True
@ -130,16 +141,22 @@ def desc_rdExp(rdExp):
if __name__ == '__main__':
#form = "{a}*-14 / (2*{b}) : -23 / 4"
#cond = ["{a} + {b} in [1, 2, 3, 4, 5]", "{a} not in [0,1]", "{b} not in [0,1]"]
#rdExp1 = RdExpression(form, cond)
#desc_rdExp(rdExp1)
#rdExp2 = RdExpression(form)
#desc_rdExp(rdExp2)
#form = "{a+a/10}*4 + {a} + 2*{b}"
#cond = ["{a} + {b} in [1, 2, 3, 4, 5]", "{a} not in [0,1]", "{b} not in [0,1]"]
#rdExp3 = RdExpression(form)
#desc_rdExp(rdExp3)
form = "{a}*-14 / (2*{b}) : -23 / 4"
cond = ["{a} + {b} in [1, 2, 3, 4, 5]", "{a} not in [1]", "{b} not in [1]"]
rdExp1 = RdExpression(form, cond)
desc_rdExp(rdExp1)
rdExp2 = RdExpression(form)
desc_rdExp(rdExp2)
form = "{a+a*10}*4 + {a} + 2*{b}"
cond = ["{a} + {b} in [1, 2, 3, 4, 5]", "abs({a}) not in [1]", "{b} not in [1]", "gcd({a},{b}) == 1"]
rdExp3 = RdExpression(form, cond)
desc_rdExp(rdExp3)
form = "{a+a*10}*4 + {a} + 2*{b}"
cond = ["{a-b} + {b} in list(range(20))", "abs({a}) not in [1]", "{b} not in [1]", "gcd({a},{b}) == 1"]
rdExp3 = RdExpression(form, cond)
desc_rdExp(rdExp3)