装饰器和迭代器

迭代器

1.for 表达式

>>> [x for x in range(10)]
[0, 1, 2, 3, 4, 5, 6, 7, 8, 9]

>>> [(x,x-1) for x in range(10) if x%2==0]
[(0, -1), (2, 1), (4, 3), (6, 5), (8, 7)]

[(x,y,z) for x in range(5) for y in range(10,20,2) for z in range(5)]

[x for x in dir(os) if not x.startswith('__')]

2.生成器
生成器写法一：

(x for x in range(10))

((x,x-1) for x in range(10) if x%2==0)

((x,y,z) for x in range(10) for y in range(10,20,2) for z in range(10))

生成器写法二：

def f():
    yield

调用方式：

f.__next__()
next(a)
for循环
send() 

3.迭代器 iterator
拥有__next__() 方法和__iter__() 方法的对象

装饰器

# 导入 logging 包
import logging
 
def decorator(func):
    def wrapper(*args, **kwargs):
        try:
            # Call the original function
            result = func(*args, **kwargs)
            # Log successful execution
            logging.info(f"Function {func.__name__} called with args: {args}, kwargs: {kwargs}")
            return result
        except Exception as e:
            # Log error with exception details
            logging.error(f"Error in {func.__name__}: {str(e)}", exc_info=True)
            # Re-raise the exception
            raise
 
    return wrapper
 
@decorator
def test(name):
    # Intentionally raise a ZeroDivisionError
    print(1/0)
 
# Configure logging (you may want to adjust the level and format)
logging.basicConfig(level=logging.INFO, format='%(asctime)s - %(levelname)s - %(message)s')
 
# Call the test function
test('zhangsan')

class Persion(object):
    def __init__(self, name):
        self.name=name
    def aa(fn):
        def new(*args,**kwargs):
            print('这一行用于判断')
            fn(*args,**kwargs)
            print('这一行是日志')
        return new
    @aa
    def say(self,address):
        print(self.name,address)
    
# p=Persion('wangendao')
# p.say('sz')
 
class BlackPersion(Persion):
    def __init__(self, name):
        super().__init__(name)
    @Persion.aa
    def new(self):
        print(self.name)
 
b=BlackPersion('zhansan')
b.say('fz')
b.new()