WebDriverWait

WebDriverWait(self, driver, timeout).until(self, method,message=‘ ‘)

def until(self, method, message=‘‘):
"""Calls the method provided with the driver as an argument until the \
return value is not False."""
end_time = time.time() + self._timeout
while(True):
try:
value = method(self._driver)
if value:
return value
except self._ignored_exceptions:
pass
time.sleep(self._poll)
if(time.time() > end_time):
break
raise TimeoutException(message)

WebDriverWait(driver, 10).until(lambda s: not self.is_element_present((By.ID, ‘delete-me’)))

WebDriverWait

原文：http://www.cnblogs.com/cfeng/p/3996363.html