def test(a,b):
    print(a,b)
test(1,2)

a,b为形参 1,2为实参 形参只有在被调用时才分配内存，在调用结束时即刻释放所分配的内存，因此形参只有在函数内部有效

 test(1,2,3)

test(y=1,x=3,z=4)

def test(a,b,c=1):
    print(a,b,c)
test(1,2)
结果：1 2 1

def test(x,*args,**kwargs):
    print(x)
    print(args)
    print(kwargs)
test(1,2,3,4,5,a = 1,b = 2)
test(1,*[2,3,4],**{‘a‘:1})
结果：1
　　 (2, 3, 4, 5)
　　 {‘a‘: 1, ‘b‘: 2}
　　  1
　　 (2, 3, 4)
　　 {‘a‘: 1}

name = ‘xulan‘  //全局变量
def test():
    print(name)
test()
结果：xulan

name = ‘xulan‘
def test():
    name = ‘aaa‘  //局部变量
    print(name)
test()
结果：aaa

name = ‘xulan‘
def test():
    name = ‘aaa‘
    print(name)
test()
print(name)
结果：aaa
　　 xulan

name = [‘a‘,‘b‘]
def test():
    name.append(‘c‘)
    print(name)
test()
print(name)
结果：[‘a‘, ‘b‘, ‘c‘]
　　  [‘a‘, ‘b‘, ‘c‘]

name = [‘a‘,‘b‘]
def test():
    global name
    name = 123
    print(name)
test()
print(name)

结果：123
　　 123

NAME = ‘ABC‘         #1
def a():
    name = ‘a‘       #3
    print(name)      #4
    def b():
        name = ‘b‘   #6
        print(name)  #7
    b()              #5
    print(name)      #8
a()                  #2

结果： a b a

name = ‘ABC‘         
def a():
    name = ‘a‘      
    def b():
        global name
        name = ‘b‘   
    b()              
    print(name)      ---- a,这里不是b，b（）函数改变的是全局变量，这里还是a（）函数的局部变量name = ‘a‘

print(name) ---- ABC 
a() 
print(name) ---- b
结果：ABC
　　  a
　　  b

name = ‘ABC‘
def a():
    name = ‘a‘
    def b():
        nonlocal name
        name = ‘b‘
    b()
    print(name)    ----b，a（）函数中的局部变量被b（）函数修改
print(name)  ---- ABC
a()
print(name)  ---- ABC，全局变量并未修改

结果：ABC
　　  b
　　  ABC