How to check whether optional function parameter is set

Question

Is there an easy way in Python to check whether the value of an optional parameter comes from its default value, or because the user has set it explicitly at the function ca

Answer 1

I agree with Volatility's comment. But you could check in the following manner:

def function(arg1,...,**optional):
    if 'optional_arg' in optional:
        # user has set 'optional_arg'
    else:
        # user has not set 'optional_arg'
        optional['optional_arg'] = optional_arg_default_value # set default