p162 매개변수에 초깃값 미리 설정

def say_myself(name, old, man=True):
    print ("my name is :%s." %name)
    print ("i am %s yrs old" %old)
    if man:
        print ("man")
    else:
        print("woman")

a = say_myself("SSS", 22, False)
print(a)