Check if a default parameter value being used : Function Default Argument : Buildin Function PYTHON examples

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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()