【堅持】Selenium+Python學習之從讀懂代碼開始 DAY6

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2018/05/23Python內建的@property裝飾器

[@property]（https://www.programiz.com/python-programming/property）
[Decorator]（https://wiki.python.org/moin/PythonDecorators#What_is_a_Decorator）
[PythonDecoratorLibrary]（https://wiki.python.org/moin/PythonDecoratorLibrary）
[FooFish-Python之禪 :理解 Python 裝飾器看這一篇就夠了]（https://foofish.net/python-decorator.html）
[python @property的用法及含義]（79221070）

#No.1import loggingdef use_logging(func):    def wrapper():        logging.warn("%s is running" % func.__name__)        return func()    return wrapperdef foo():    print(‘i am foo‘)foo = use_logging(foo)foo()

import loggingdef use_logging(func):    def wrapper():        logging.warn("%s is running" % func.__name__)        return func()    return wrapperuse_loggingdef foo():    print("i am foo")foo()

resut:WARNING:root:foo is runningi am foo

#No.2import loggingdef use_logging(level):    def decorator(func):        def wrapper(*args, **kwargs):            if level == "warn":                logging.warn("%s is running" % func.__name__)            elif level == "info":                logging.info("%s is running" % func.__name__)            return func(*args)        return wrapper    return decorator@use_logging(level="warn")def foo(name=‘foo‘):    print("i am %s" % name)foo()

resut:WARNING:root:foo is runningi am foo

#No.3class Rectangle(object):    def __init__(self):        self.width = 10        self.heigh = 20r = Rectangle()print(r.width, r.heigh)r.width = 1.0print(r.width, r.heigh)

resut:10 201.0 20

#No.4class Rectangle(object):    @property    def width(self):        return self.true_width    @property    def height(self):        return self.true_heights = Rectangle()s.width = 1024s.height = 768print(s.width, s.height)

resut:Traceback (most recent call last):  File "D:/fly/Python/test.py", line 23, in <module>    s.width = 1024AttributeError: can‘t set attribute

【堅持】Selenium+Python學習之從讀懂代碼開始 DAY6