最近在学习 appium 示例代码是遇到错误：
示例代码中 from appium import SauceTestCase 语句在运行中报 ImportError: cannot import name SauceTestCase。
我在 python 目录下发现 SauceTestCase 是 saucetestcase 模块中的类，运行时又报 ImportError: No module named sauceclient 错误。

无奈。。。继续查看 saucetestcase 代码，代码中有 from sauceclient import SauceClient 语句。但是 appium 下没有找到 sauceclient 模块。。。。请问各个大神这个问题该怎么解决？是我 appium 的问题吗？

附示例代码：

from appium import webdriver
from appium import SauceTestCase, on_platforms
from appium.webdriver.common.touch_action import TouchAction
from appium.webdriver.common.multi_action import MultiAction

from time import sleep

app = "http://appium.github.io/appium/assets/ApiDemos-debug.apk"
platforms = [{
                "platformName": "Android",
                "platformVersion": "4.4",
                "deviceName": "test",
                "appActivity": ".graphics.TouchPaint",
                "app": app,
                "appiumVersion": "1.3.4"
            }]


@on_platforms(platforms)
class AndroidGesturesSauceTests(SauceTestCase):

    def test_drag_and_drop(self):
        # first get to the right activity
        self.driver.start_activity("io.appium.android.apis", ".view.DragAndDropDemo")

        start = self.driver.find_element_by_id("io.appium.android.apis:id/drag_dot_3")
        end = self.driver.find_element_by_id("io.appium.android.apis:id/drag_dot_2")

        action = TouchAction(self.driver);
        action.long_press(start).move_to(end).release().perform()

        sleep(.5)

        text = self.driver.find_element_by_id("io.appium.android.apis:id/drag_result_text").text
        self.assertEqual(text, "Dropped!")


    def test_smiley_face(self):
        # just for the fun of it.
        # this doesn't really assert anything.
        # paint
        eye1 = TouchAction()
        eye1.press(x=150, y=100).release()

        eye2 = TouchAction()
        eye2.press(x=250, y=100).release()

        smile = TouchAction()
        smile.press(x=110, y=200) \
            .move_to(x=1, y=1) \
            .move_to(x=1, y=1) \
            .move_to(x=1, y=1) \
            .move_to(x=1, y=1) \
            .move_to(x=1, y=1) \
            .move_to(x=2, y=1) \
            .move_to(x=2, y=1) \
            .move_to(x=2, y=1) \
            .move_to(x=2, y=1) \
            .move_to(x=2, y=1) \
            .move_to(x=3, y=1) \
            .move_to(x=3, y=1) \
            .move_to(x=3, y=1) \
            .move_to(x=3, y=1) \
            .move_to(x=3, y=1) \
            .move_to(x=4, y=1) \
            .move_to(x=4, y=1) \
            .move_to(x=4, y=1) \
            .move_to(x=4, y=1) \
            .move_to(x=4, y=1) \
            .move_to(x=5, y=1) \
            .move_to(x=5, y=1) \
            .move_to(x=5, y=1) \
            .move_to(x=5, y=1) \
            .move_to(x=5, y=1) \
            .move_to(x=5, y=0) \
            .move_to(x=5, y=0) \
            .move_to(x=5, y=0) \
            .move_to(x=5, y=0) \
            .move_to(x=5, y=0) \
            .move_to(x=5, y=0) \
            .move_to(x=5, y=0) \
            .move_to(x=5, y=0) \
            .move_to(x=5, y=-1) \
            .move_to(x=5, y=-1) \
            .move_to(x=5, y=-1) \
            .move_to(x=5, y=-1) \
            .move_to(x=5, y=-1) \
            .move_to(x=4, y=-1) \
            .move_to(x=4, y=-1) \
            .move_to(x=4, y=-1) \
            .move_to(x=4, y=-1) \
            .move_to(x=4, y=-1) \
            .move_to(x=3, y=-1) \
            .move_to(x=3, y=-1) \
            .move_to(x=3, y=-1) \
            .move_to(x=3, y=-1) \
            .move_to(x=3, y=-1) \
            .move_to(x=2, y=-1) \
            .move_to(x=2, y=-1) \
            .move_to(x=2, y=-1) \
            .move_to(x=2, y=-1) \
            .move_to(x=2, y=-1) \
            .move_to(x=1, y=-1) \
            .move_to(x=1, y=-1) \
            .move_to(x=1, y=-1) \
            .move_to(x=1, y=-1) \
            .move_to(x=1, y=-1)
        smile.release()

        ma = MultiAction(self.driver)
        ma.add(eye1, eye2, smile)
        ma.perform()

        # so you can see it
        sleep(10)

附 saucetestcase 代码：

#!/usr/bin/env python

# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

import unittest
import os
import sys
import new
from appium import webdriver
from sauceclient import SauceClient

SAUCE_USERNAME = os.environ.get('SAUCE_USERNAME')
SAUCE_ACCESS_KEY = os.environ.get('SAUCE_ACCESS_KEY')
sauce = SauceClient(SAUCE_USERNAME, SAUCE_ACCESS_KEY)


def on_platforms(platforms):
    def decorator(base_class):
        module = sys.modules[base_class.__module__].__dict__
        for i, platform in enumerate(platforms):
            d = dict(base_class.__dict__)
            d['desired_capabilities'] = platform
            name = "%s_%s" % (base_class.__name__, i + 1)
            module[name] = new.classobj(name, (base_class,), d)
    return decorator


class SauceTestCase(unittest.TestCase):
    def setUp(self):
        self.desired_capabilities['name'] = self.id()
        sauce_url = "http://%s:%s@ondemand.saucelabs.com:80/wd/hub"
        self.driver = webdriver.Remote(
            desired_capabilities=self.desired_capabilities,
            command_executor=sauce_url % (SAUCE_USERNAME, SAUCE_ACCESS_KEY)
        )
        self.driver.implicitly_wait(30)

    def tearDown(self):
        print("Link to your job: https://saucelabs.com/jobs/%s" % self.driver.session_id)
        try:
            if sys.exc_info() == (None, None, None):
                sauce.jobs.update_job(self.driver.session_id, passed=True)
            else:
                sauce.jobs.update_job(self.driver.session_id, passed=False)
        finally:
            self.driver.quit()