Check if a default parameter value being used : Function Default Argument « Function « Python

1. Python
2. Function
3. Function Default Argument

Check if a default parameter value being used

def saver(x=None):
     if x is None:         # no argument passed?
         x = []            # run code to make a new list
     x.append(1)           # changes new list object
     print x

saver([2])

saver()                   # doesn't grow here

saver()


           
       

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6.	Default Argument Values: a simple demo
7.	Default Argument Values: default values are evaluated at the point of function definition
8.	Default Argument Values: default value is evaluated only once
9.	Default Argument Values: If you don't want the default to be shared between subsequent calls