What you want is for an assignment in a function definition to be a lambda. def foo (self, arg=lambda : expression): Assignment of unevaluated expressions i

What you want is for an assignment in a function definition to be a lambda. def foo (self, arg=lambda : expression): Assignment of unevaluated expressions is not a thing yet in Python and would be really surprising. If you really want that, that is what you get with a lambda. > most languages with closures and default values for arguments do it this way. Do these also evaluate function definitions at runtime?