Default parameter values
# positional parameters
# parameters with default values
def birthday2(name = "Jackson", age = 1):
print "Happy birthday,", name, "!", " I hear you're", age, "today.\n"
birthday2()
birthday2(name = "Katherine")
birthday2(age = 12)
birthday2(name = "Katherine", age = 12)
birthday2("Katherine", 12)
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