Function calling counter extracted from https://github.com/hchasestevens/hchasestevens.github.io/blob/master/notebooks/the-decorators-they-wont-tell-you-about.ipynb?utm_source=hackernewsletter&utm_medium=email&utm_term=code

function_holder.py

class FunctionHolder(object):
    def __init__(self, function):
        self.func = function
        self.called_count = 0
    def __call__(self, *args, **kwargs):
        try:
            return self.func(*args, **kwargs)
        finally:
            self.called_count += 1
            
def held(function):
    return FunctionHolder(function)

@held
def i_am_counted():
    pass

i_am_counted()
i_am_counted()
i_am_counted()
i_am_counted.called_count

@FunctionHolder
def i_am_also_counted(val):
    print(val)
    
i_am_also_counted('a')
i_am_also_counted('b')
i_am_also_counted.called_count