Hi, I am new to sympy. I am trying to understand what is the best practice
to check head of expression? For example:
expr = sympify("somefunc(1-x)")
How to understand that head of expr is somefunc? I can do it like this:
if str(expr.func) == "somefunc"
Is this a best practice or there is a better way to do this?
And by the way, if I have the expression:
expr = sympify("x")
How can I check that expr is some variable (not necessary "x", but in more
broader sense)?
Or:
expr = sympify("5.5777")
how to check that expr is some number?
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