new classmethod for Expression tmp_render which is used with "with"
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@ -28,6 +28,46 @@ class Expression(object):
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def set_default_render(cls):
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cls.set_render(cls.DEFAULT_RENDER)
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@classmethod
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def tmp_render(cls, render = lambda _,x:Expression(x)):
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""" Create a container in which Expression render is temporary modify
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The default temporary render is Expression in order to perform calculus inside numbers
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>>> exp = Expression("2*3/5")
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>>> print(exp)
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\\frac{ 2 \\times 3 }{ 5 }
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>>> for i in exp.simplify():
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... print(i)
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\\frac{ 2 \\times 3 }{ 5 }
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\\frac{ 6 }{ 5 }
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>>> with Expression.tmp_render():
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... for i in exp.simplify():
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... i
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< Expression [2, 3, '*', 5, '/']>
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< Expression [6, 5, '/']>
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< Fraction 6 / 5>
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>>> with Expression.tmp_render(txt):
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... for i in exp.simplify():
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... print(i)
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2 * 3 / 5
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6 / 5
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>>> for i in exp.simplify():
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... print(i)
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\\frac{ 2 \\times 3 }{ 5 }
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\\frac{ 6 }{ 5 }
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"""
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class TmpRenderEnv(object):
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def __enter__(self):
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self.old_render = Expression.get_render()
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Expression.set_render(render)
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def __exit__(self, type, value, traceback):
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Expression.set_render(self.old_render)
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return TmpRenderEnv()
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@classmethod
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def random(self, form="", conditions=[], val_min = -10, val_max=10):
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"""Create a random expression from form and with conditions
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@ -299,10 +339,10 @@ def test(exp):
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print("\n")
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if __name__ == '__main__':
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render = lambda _,x : str(x)
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Expression.set_render(render)
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exp = Expression("1/2 - 4")
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print(list(exp.simplify()))
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#render = lambda _,x : str(x)
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#Expression.set_render(render)
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#exp = Expression("1/2 - 4")
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#print(list(exp.simplify()))
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#Expression.set_render(txt)
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#exp = "2 ^ 3 * 5"
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@ -386,8 +426,8 @@ if __name__ == '__main__':
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#for i in exp.simplify():
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# print(i)
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#import doctest
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#doctest.testmod()
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import doctest
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doctest.testmod()
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# -----------------------------
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# Reglages pour 'vim'
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