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 have to implement __eq__() . For example ::

class A(object):
    def __eq__(self, other):
        return (self, '==', other)

Then, for the function, which you want to get the expression, like ::

def my_func(expr):
    # deal with the expression
    print(expr)

>>> a = A()
>>> my_func(a == 1)
(<__main__.A object at 0x1015eb978>, '==', 1)