Passing expressions to functions?

Question

I\'m not quite sure what I mean here, so please bear with me..

In SQLAlchemy, it appears I\'m supposed to pass an expression to filter() in certain cases. When I try to

Answer 1

You can't. The expression 5 == 5 is evaluated and only then is the result passed to someFunc. The function just gets True (the True object, to be precise), no matter what the expression was.

Edit: Concerning your edit, this question is kind of close.

Edit 2: You could just pass the expression as a string and use eval, like this:

>>> def someFunc(expression_string):
...    print(expression_string, "evaluates to", eval(expression_string))

>>> someFunc("5 == 5")
5 == 5 evaluates to True

Don't know whether that helps you. Keep in mind that eval is a powerful tool, so it's dangerous to pass arbitrary (and possibly even user-generated) input to it.