python：递归方法理解

Question

What is wrong with what I am doing? In the approach, the control always goes back to the else part even after coming to the if clause:

def recurse(param1, param2):
    is_bool = some_func_that_returns_boolean(param1, param2)
    if is_bool is False:
        return 1 # exit the func
    else:
        recurse(param1, param2)

Answer 1

You need to add return to the end of the function to explicily return the value of the recursive function. And better use if not :

def recurse(param1, param2):
    is_bool = some_func_that_returns_boolean(param1, param2)
    if not is_bool:
        return 1 # exit the func
    else:
        return recurse(param1, param2)