【1】

函数的小高级

1.1函数名作为变量名使用

def func():
    print(123)
ret = func
ret()


def func():
    print(123)
func_list = [func,func,func]
for item in func_list:
    v = item()
    print(v)


def func():
    print(123)
def bar():
    print(666)
info = {'k1':func,'k2':bar}
info['k1']()
info['k2']()


def func():
    return 123
func_list1 = [func,func,func]
func_list2 = [func(),func(),func()]
print(func_list1)
print(func_list2)

info = {
    'k1':func,
    'k2':func()
    }
print(info)  #打印返回值

1.2 函数作为参数进行传递

def func(args):
    print(args)  #打印函数的地址
def show():
    return 999
func(show)  


def func(args):
    v1 = args()
    print(v1)
def show():
    print(66)   
func(show)
    

1.3 函数名+（）无论在哪都是调用函数

2.内置函数

lambda函数

def func(a1,a2):
　　return a1 + 100
print(func(1))

通过lambda表达式简化：
func = lambda a1,a2 :a1+100  #a1和a2相当于形参；a1+100相当于return返回值
print（func（1））

func1 = lambda ： 100   #相当于没有参数，直接返回100

func2 = lambda x1: x1 * 10

func3 = lambda *args,**kwargs: len(args) + len(kwargs)
DATA = 100
func4 = lambda a1: a1 + DATA

v = func4(1)
print(v)
DATA = 100
def func():
DATA = 1000
func4 = lambda a1: a1 + DATA
v = func4(1)
print(v)
func()

func5 = lambda n1,n2: n1 if n1 > n2 else n2
v = func5(1111,2)
print(v)

User_list = []
def func0(x):
    v = User_list.append(x)
    return v  #没有返回值
result = func0('tom')
print(result)