Can a Python method check if it has been called from within itself?

Question

Let\'s say I have a Python function f and fhelp. fhelp is designed to call itself recursively. f should not be called rec

Answer 1

You could use a flag set by a decorator:

def norecurse(func):
    func.called = False
    def f(*args, **kwargs):
        if func.called:
            print "Recursion!"
            # func.called = False # if you are going to continue execution
            raise Exception
        func.called = True
        result = func(*args, **kwargs)
        func.called = False
        return result
    return f

Then you can do

@norecurse
def f(some, arg, s):
    do_stuff()

and if f gets called again while it's running, called will be True and it will raise an exeption.