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[英]Can I pass an argument into my decorator function when I call the inner/decorated function?
[英]Pass decorator argument to inner function
我正在继续学习 python。但是我有一些想法但面临实施问题。 我正在使用 selenium 并且每个元素的原因我都有多个案例,例如:
submit_btn = (By.XPATH, "//button[@type='submit']")
revert_btn = (By.XPATH, "//button[@class='revert']")
这让我很恼火,因为我总是复制 By.CSS_SELECTOR 或 xpath。我想制作一个装饰器,它采用默认设置为“css”的路径参数和 by_what 参数,并用于操作 WebDriver,如:
@by("[data-qa='selected']")
def save_form(self):
self.find_element().click()
我的方法 find_element 看起来像:
def find_element(self, locator, time=10):
try:
el = WebDriverWait(self.browser, time).until(ec.presence_of_element_located(locator),
message=f"Can't find elements by locator {locator}")
return el
except TimeoutException:
return False
except StaleElementReferenceException:
return WebDriverWait(self.browser, time).until(ec.staleness_of(locator),
message=f"Can't find element by locator {locator}")
或者也许是另一种方式。 我试图创建像这样的装饰器:
def by(selector, what="css", data_qa=True):
def inner_function(function):
def wrapper(param):
if what == "css":
find_by = By.CSS_SELECTOR
elif what == "xpath":
find_by = By.XPATH
if data_qa:
path = (find_by, f"[data-qa='{param}']")
else:
path = (find_by, selector)
return function(path)
return wrapper
return inner_function
并且很高兴将其用作
@by('selected')
def get_selected_el(self)
# set path returned by decorator to find element method
self.find_element(smth_returned_by_decorator)
所以我想将定位器作为装饰器实现传递。 如何做呢?
执行类似操作的一种可能方法是在装饰器返回的 function 中没有公开的装饰器 function 中有一个参数:
# Decorator that automatically forwards an argument
def autoparam(param):
def decorator(f):
def wrapper(self):
f(self, param)
return wrapper
return decorator
class MyClass:
def method1(self, param):
print(param)
@autoparam('method2 value')
def method2(self, param):
self.method1(param)
# Test
obj = MyClass()
# Calling method2 does not require an argument
obj.method2()
# method2 value
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