[BUG]Appium1.9.1 这个问题竟然花了我5分钟进行定位

1、先上问题，知道是什么问题先

 EE
 ======================================================================
 ERROR: testCalcu (__main__.MyTest)
 ----------------------------------------------------------------------
 Traceback (most recent call last):
   File "D:\WorkSpace3\EXAMPLE\Appiu_ex\test.py", line 28, in testCalcu
     self.driver.find_element_by_id("com.txt.calculator:id/tv_skip").click()
 AttributeError: 'MyTest' object has no attribute 'driver'

 ======================================================================
 ERROR: testCalcu (__main__.MyTest)
 ----------------------------------------------------------------------
 Traceback (most recent call last):
   File "D:\WorkSpace3\EXAMPLE\Appiu_ex\test.py", line 25, in tearDown
     self.driver.quit()
 AttributeError: 'MyTest' object has no attribute 'driver'

 ----------------------------------------------------------------------
 Ran 1 test in 0.001s

 FAILED (errors=2)

2、再上源码，如果你也在5分钟内未找到该问题原因，呵呵，那就在后续写代码中一定要仔细再仔细

 # -*- coding:utf-8 -*-
 from appium import webdriver
 import unittest

 class MyTest(unittest.TestCase):
     def setup(self):
         desired_caps = {}
         desired_caps['platformName'] ='Android'
         desired_caps['platformVersion'] ='6.0'
         desired_caps['deviceName'] ='DIYTHYTCCQBIV47D'
         desired_caps['appPackage'] ='com.txt.calculator'
         desired_caps['appActivity'] ='.Calculator'
         desired_caps["unicodeKeyboard"] ="True"
         desired_caps["resetKeyboard"] ="True"
         self.driver = webdriver.Remote('http://localhost:4723/wd/hub', desired_caps)

     def tearDown(self):
         self.driver.quit()

     def testCalcu(self):
         self.driver.find_element_by_id("com.txt.calculator:id/tv_skip").click()
         self.driver.find_element_by_id("com.txt.calculator:id/digit_8").click()
         self.driver.find_element_by_id("com.txt.calculator:id/op_add").click()
         self.driver.find_element_by_id("com.txt.calculator:id/digit_5").click()
         self.driver.find_element_by_id("com.txt.calculator:id/eq").click()
         try:
             result = self.driver.find_element_by_class_name("android.widget.EditText").text
             self.assertEqual('', result, "The result isn't right")
         except Exception as e:
             print (e)
             self.fail("The element is wrong or non-exists")

 if __name__ == '__main__':
     unittest.main()

3、duang   duang  duang duang开始计时

~~~~~5分钟之后，给出出问题的源码

class MyTest(unittest.TestCase):
    def setup(self):

　　注意setup   此处 up首字要大写，如未按照unittest框架的要求进行编写，它自然就不会先进行初使化了，自然也就出现后面的报错 MyTest实例中没有driver的属性

修改正确如下：

class MyTest(unittest.TestCase):
    def setUp(self):