更改实例返回python的内容
我已经为SeleniumWebDriver创建了一个单例包装器更改实例返回python的内容,python,inheritance,singleton,Python,Inheritance,Singleton,我已经为SeleniumWebDriver创建了一个单例包装器 class Singleton(type): _instances = {} def __call__(cls, *args, **kwargs): if cls not in cls._instances: cls._instances[cls] = super(Singleton, cls).__call__(*args, **kwargs) return
class Singleton(type):
_instances = {}
def __call__(cls, *args, **kwargs):
if cls not in cls._instances:
cls._instances[cls] = super(Singleton, cls).__call__(*args, **kwargs)
return cls._instances[cls]
class Driver(metaclass=Singleton):
"""Ensures theres only 1 Driver open at any time.
If the driver is closed, tries to quit the previous
instance, and recreates a new one"""
def __init__(self):
self._driver = self.load_selenium_driver()
@staticmethod
def load_selenium_driver():
_chrome_driver_locn = CHROME_DRIVER_LOCATION
_driver = webdriver.Chrome(_chrome_driver_locn)
return _driver
@property
def driver(self):
"""Creates a new driver if the previous one is closed,
and quits the instance of the chrome driver."""
if self._web_browser_is_open():
return self._driver
else:
try:
self._driver.quit()
finally:
self._driver = self.load_selenium_driver()
return self._driver
def _web_browser_is_open(self):
try:
self._driver.title
return True
except WebDriverException:
return False
正在运行a=Driver()
我想访问a
中的Driver.Driver
方法,这样我就不需要执行a.Driver.get('google.com')
,而是a.get('google.com')
问题是:
如何创建驱动程序实例,返回
Driver
对象(可在属性Driver.Driver
中找到),而不是Driver
的实例?根据评论中的讨论,我所要求的是不可能的 Foo()
不“调用”类实例,而是创建一个类实例。你为什么要这样做?问题的背景是什么?为什么不直接使用a=5
?使用标识符表达式将始终返回标识符绑定到的对象。它不会返回其他内容。你是什么意思?@啊,你在评论中要求的和你的问题要求的是两个完全不同的东西。我重新打开了问题,删除了开始代码(并用更相关的代码替换)