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#演示可变参数函数
#!/usr/bin/python
def f1(a,b): print a,b
def f2(a,*b): print a,b
def f3(a,**b): print a,b
def f4(a,*b,**c): print a,b,c
def f5(a,b=2,c=3): print a,b,c
def f6(a,b=2,*c): print a,b,c
f1(1,2) 1 2
f1(b=2,a=1)
f2(1,2,3,4) 1 (2, 3, 4)
f3(1,x=2,y=3,z=4) 1 {'y': 3, 'x': 2, 'z': 4}
f4(1,x=2,y=3) 1 () {'y': 3, 'x': 2}
f5(1) 1 2 3
f5(1,4) 1 4 3
f6(1) 1 2 ()
f6(1,3,4,5,4) 1 3 (4,5,4)