python 基础知识

python 中del ,pop ,popitem ,remove 比较图

cmd	args	list	dict
del	has	del l[index]  ;  del l[start:end]	del dict[key]
	hasn't	del all	del all
pop	has	list.pop(index)	dict.pop(key) #随机的
	hasn't	del all	NO
popitem	has	NO	dict.popitem(key)
	hasn't	NO	NO
remove	has	list.remove(ele)	NO
	hasn't	NO	NO

装饰器：

def f():
    print('function name : ', f.__name__ , '
')

print(f) # f 函数名指在内存中的位置，f():执行函数，或者函数调用
f()

##############################################################################

def outer(func):
    def inner(*args , **kwargs):
        print('before ....... ')
        res = func(*args, **kwargs)
        print('after  ....... ')
        return res

    return inner

@outer
def f2():
    print('function name : ', f2.__name__)

@outer
def f3(l , d):
    print('list : {0}'.format(l))
    print('dict : {0}'.format(d))


f2()
f3(['a' , 'b' ] ,{'c':111})

　

Result :
　

<function f at 0x7f1a8d03ee18>
function name :  f 

before ....... 
function name :  inner
after  ....... 
before ....... 
list : ['a', 'b']
dict : {'c': 111}
after  ....... 

　　

 EG3:

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