appium学习，webdriver.Remote方法

Question

from appium import webdriver


class TestSimple(object):

    @classmethod
    def setup_class(cls):
        print("------ setup before class TestSohu ------")
        a = {'platformName': 'Android',
             'platformVersion': '5.1.1',
             'deviceName': '127.0.0.1:21503',
             'appPackage': 'com.seafile.seadroid2',
             'appActivity': '.ui.activity.BrowserActivity',
             'sessionOverride': 'true',
             'unicodeKeyboard': 'true',
             'resetKeyboard': 'false',
             'noSign': 'true',
             'noReset': 'true',
             }
        cls.driver = webdriver.Remote("http://127.0.0.1:4723/wd/hub", a)
        print(cls.driver)
        cls.driver.implicitly_wait(10)

    def test_login_success(self):
        print(123)

    @classmethod
    def teardown_class(cls):
        print("------ teardown after class TestSohu ------")
        cls.driver.quit()

为啥一直报错self = <[AttributeError("'WebDriver' object has no attribute 'session_id'") raised in repr()] WebDriver object at 0x1e3d2ab6940>
command_executor = 'http://127.0.0.1:4723/wd/hub'
desired_capabilities = {'appActivity': '.ui.activity.BrowserActivity', 'appPackage': 'com.seafile.seadroid2', 'deviceName': '127.0.0.1:21503', 'noReset': 'true', ...}
browser_profile = None, proxy = None, keep_alive = False

def __init__(self, command_executor='http://127.0.0.1:4723/wd/hub',
             desired_capabilities=None, browser_profile=None, proxy=None, keep_alive=False):

  super(WebDriver, self).__init__(command_executor, desired_capabilities, browser_profile, proxy, keep_alive)

E TypeError: init() takes from 1 to 5 positional arguments but 6 were given

Answer 1

引自强大而免费的微信小程序：皆我百晓生。

---

根据报错信息，发现是因为webdriver.Remote方法的参数传递出错。正确的用法是将desired_capabilities字典作为一个参数传递给webdriver.Remote方法，而不是把每个键值对作为单独的参数传递。

在代码中的正确的用法是：

class TestSimple(object):
 
    @classmethod
    def setup_class(cls):
        print("------ setup before class TestSohu ------")
        desired_capabilities = {
            'platformName': 'Android',
            'platformVersion': '5.1.1',
            'deviceName': '127.0.0.1:21503',
            'appPackage': 'com.seafile.seadroid2',
            'appActivity': '.ui.activity.BrowserActivity',
            'sessionOverride': 'true',
            'unicodeKeyboard': 'true',
            'resetKeyboard': 'false',
            'noSign': 'true',
            'noReset': 'true',
        }
        cls.driver = webdriver.Remote(command_executor='http://127.0.0.1:4723/wd/hub', desired_capabilities=desired_capabilities)
        print(cls.driver)
        cls.driver.implicitly_wait(10)

请注意，将desired_capabilities作为一个参数传递给webdriver.Remote方法时，要使用参数名desired_capabilities=desired_capabilities，而不是只传递desired_capabilities变量。