'''#创建函数def hello(name): return 'hello,%s' % name
print(hello('xuuyoujia'))##文档化函数def squre(nm): 'Calculates the square of the number nm' return nm*nmprint(squre(2)) def print_param1(x,y=2): print(x,y)def print_param2(x=1,y=2,z=3): print(x,y,z)def print_param3(*params): print(params)def print_param4(**params): print(params)def print_param5(x,y,*params1,**params2): print(x) print(y) print(params1) print(params2)
#print_param1(1,3)#print_param1(1) print_param2()print_param3(1,2,3,4,5)print_param4(x=1,aa=2,cc=3,dd=4)print_param5(1,2,3,4,5,6,5,z=1,h=3)#print_param5(1,2,3,4,x=1,y=3,5,6,5)#positional argument can not appear after keywords argumentprint_param5(1,2,3,4,5,6,5,z=1,h=3)#作用域'''
递归：函数可以调用自身，一切用递归实现的功能都可以用循环实现，只不过有些时候递归函数更易读函数式编程：lambda表达式以及map,filter和reduce lambda在数学中表示匿名函数
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