Hi !

I'm working on a project where I need to save expressions unevaluated. So 
far so good, but I'm having a problem with boolean operators.
Here is an example of expression (coming from test units, thus the apparent 
weirdness) :

True && False

which I'm writing in Sympy as :

sympy.And(sympy.true, sympy.false, evaluate=False)

Problem is that, contrary to other sympy operators/functions, the 
evaluate=False seems to have no effect. This always evaluate the expression
Is there any other way to prevent that ? Am I doing something wrong ? 

Many thanks for what is already an awesome library :)

Vincent

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