def foo():
    print('from foo')

foo()
func=foo    #引用,赋值
func()
print(foo)
print(func)

def hi():
    return "hi yasoob!"

def doSomethingBeforeHi(func):
    print("I am doing some boring work before executing hi()")
    print(func())

doSomethingBeforeHi(hi)

def func(): # func=函数的内地址
    print('from func')

# print(func)

age=10
def bar(x):
    return x

res=bar(age)
print(res)

res=bar(func)
print(res)

def func(): # func=函数的内地址
    print('from func')
age=10
l=[age,func,func()]
print(l)

def max2(x,y):
    if x > y:
        return x
    else:
        return y

def max4(a,b,c,d):
    res1=max2(a,b)
    res2=max2(res1,c)
    res3=max2(res2,d)
    return res3

print(max4(1,2,3,4))

# from math import pi
# # print(pi)
#
# def circle(radius,action=0):
#     """
#     圆形相关运算
#     :param radius: 半径
#     :param action: 0代表求面积,1代表求周长
#     :return: 面积或者周长
#     """
#     def area(radius):
#         return pi * (radius ** 2)
#
#     def perimiter(radius):
#         return 2 * pi * radius
#
#     if action == 0:
#         res=area(radius)
#     elif action == 1:
#         res=perimiter(radius)
#
#     return res
#
# print(circle(10,0))
# print(circle(10,1))

x、y、z、b、foo都是全局
m不是
x=1
y=2
if x=1：
    z=3
while Ture：
    b=4
def foo（）：
    m=3

# x=111
# def outer():
#     def inner():
#         print('from inner',x) # x访问的时全局名称空间中x
#     return inner
#
# f=outer()
# # print(f)
#
# x=222
# f()

#global:在局部声明一个名字是来自于全局作用域的，可以用来在局部修改全局的不可变类型
# x=1
# def foo():
#     global x
#     x=2
#
# foo()
# print(x)

#nonlocal:声明一个名字是来自于当前层外一层作用域的，可以用来在局部修改外层函数的不可变类型
# x=0
# def f1():
#     x=111
#     def f2():
#         nonlocal x
#         x=222
#     f2()
#     print(x)
#
# f1()
# print(x)

def outter():
    x=111
    def inner():
        print(x)
    return inner

f=outter() #f=outter内的inner

# x=22222
# f()
def func():
    x=3333
    f()

func()

# 为函数体传值的方式一：参数
# def func(x,y):
#     print(x+y)
#
# func(1,2)

# 为函数体传值的方式二：闭包
# def outter(x,y):
#     # x=1
#     # y=2
#     def func():
#         print(x+y)
#     return func
#
# f=outter(1,2)
# f()