1. 定义函数
def 函数名(形参):
函数体
return xxx--------其下面的内容不再执行
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2.执行函数
函数名(实参)
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3.形参，实参（默认按照顺序）
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4.执行形参传入实参，可不按照顺序
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5.函数可以有默认参数
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6.动态参数
#动态参数一,类型为元祖，传的参数为元祖的元素
def f1(*a):
print (a,type(a))
f1(123,234,[456123789],{1:2})
#动态参数二，类型为字典，传入的参数为字典的键值对
def f1(**a):
print (a,type(a))
f1(k1=123,k2=456)
#万能动态参数-------一*较**在前
def f1(*a,**p):
print (a,type(a),type(p))
f1(123,234,[456123789],{1:2},k1=123,k2=456)
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((123, 234, [456123789], {1: 2}), <type 'tuple'>)
({'k2': 456, 'k1': 123}, <type 'dict'>)
((123, 234, [456123789], {1: 2}), <type 'tuple'>, <type 'dict'>)
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7.为动态参数传入字典，列表
def f1(*args):
print (args,type(args))
l1=[11,22,33,44]
f1(l1)
f1(*l1)
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(([11, 22, 33, 44],), <type 'tuple'>)
((11, 22, 33, 44), <type 'tuple'>)
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def f2(**args):
print (args,type(args))
l1={"k1":"123"}
f2(l1=l1)
f2(**l1)
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({'l1': {'k1': '123'}}, <type 'dict'>)
({'k1': '123'}, <type 'dict'>)
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8.全局变量，局部变量
P="chushujin"
def func1():
#局部变量
a=123
global P #加上此关键词后，全局变量就会被修改，否则不会被修改
print (a)
P="zhangyu"
def func2():
print (P)
func1()
func2()
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123
zhangyu