[sympy] Looking for an Indicator function

[Korrignu]

Hello,

I'm a beginner with SymPy and I need to use an indicator function which
returns 1 when a condition holds and 0 otherwise.

I have this kind of stuff :
mu*(0<a<1)+(1-mu)*(a>1)

when I subsitute "mu" with a value, there is no problem, but when I
substitute "a" there is a problem with the multiplication between an
integer and a boolean

What is the good way to do ? Is there an indicator function ?

Thanks,

Regards

K.

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