def func():# func=函数的内地址print('from func')print(func)age=10
#1. 可以被引用
x=age
print(x,age)f=func
print(f)
f()#2. 可以当作参数传给另外一个函数
def bar(x):print(x)bar(age)
bar(func)#3. 可以当作一个函数的返回值
def bar(x):return xres=bar(age)
print(res)res=bar(func)
print(res)#4. 可以当作容器类型的元素
l=[age,func,func()]
print(l)

def max2(x,y):if x > y:return xelse:return ydef max4(a,b,c,d):res1=max2(a,b)#2res2=max2(res1,c)#3res3=max2(res2,d)#4return res3print(max4(1,2,3,4))#4

def outter():x=1print('from outter')def inner():print('from inner')print(x)print(inner)outter()
#from outter
#1
#<function outter.<locals>.inner at 0x000001D175B7CB70>inner()#无法在外部调用内部函数

def f1():print('from f1')def f2():print('from f2')def f3():print('from f3')f3()f2()
f1()
#from f1
#from f2
#from f3

from math import pi
print(pi)#3.141592653589793def 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 * radiusif action == 0:res=area(radius)elif action == 1:res=perimiter(radius)return resprint(circle(10,0))#314.1592653589793
print(circle(10,1))#62.83185307179586

x=1
y=2
if x == 1:z=3while True:b=4breakdef foo():m=3

len=111def foo():len=222print(len)foo()
print('站在全局找len: ',len)

x=111def f1():x=222def f2():def f3():x=444print(x)#444x=333f3()f2()
f1()    

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

x=111
def outer():def inner():print('from inner',x) # x访问的时全局名称空间中xreturn innerf=outer()# x=222
def func():x=333f()x=444func()#444

x=111
def outer():def inner():print('from inner',x) # x是来自于当前层的名字，但是此时的x并未定义x=2222222222return innerf=outer()f()

x=1#全局存活def foo():y=2print(x)#1def bar():print(x)#1foo()
bar()

x=1
def foo():x=2#局部有效
foo()
print(x)#1

l=[]#这个l是存放在全局空间
def foo():l.append(1)#报错，在局部名称空间中没有ll=33333
foo()
print(l)

x=1
def foo():global xx=2
foo()
print(x)#2

x=0
def f1():x=111def f2():nonlocal x#只能修改当前函数的外面一层而已x=222f2()print(x)#222f1()
print(x)#0

def outter():x=111def inner():print(x)return innerf=outter() #f=outter内的inner

def func(x,y):print(x+y)
func(1,2)

def outter(x,y):def func():print(x+y)return funcf=outter(1,2)
f()

pip3 install requestsimport requests
def get(url):response=requests.get(url)if response.status_code == 200:print(len(response.text))get('https://www.baidu.com')
get('https://www.baidu.com')
get('https://www.baidu.com')
get('https://www.tmall.com')
get('https://www.tmall.com')url1='https://www.baidu.com'
url2='https://www.tmall.com'get(url1)
get(url1)
get(url1)get(url2)
get(url2)
get(url2)

def outter(url):# url='https://www.baidu.com'def get():response=requests.get(url)if response.status_code == 200:print(len(response.text))return getbaidu=outter('https://www.baidu.com')tmall=outter('https://www.tmall.com')