我正在使用browserstack设置自动化环境。我尝试根据他们的指令实现以下代码：

from Appium import webdriver
enter code here`from Appium.webdriver.common.mobileby import MobileBy
from selenium.webdriver.support.ui import WebDriverWait
from selenium.webdriver.support import expected_conditions as EC
import time

userName = "cathytest1"
accessKey = "5u8P4kxrPdw3bCDPtyCU"

desired_caps = {
    "build": "Python Android",
    "device": "Samsung Galaxy S8 Plus",
    "app": "bs://fa77cdc35c9dea891b543c3ab6bf2897b300e229"
}

driver = webdriver.Remote("http://" + userName + ":" + accessKey + "@hub- 
cloud.browserstack.com/wd/hub", desired_caps)

search_element = WebDriverWait(driver, 30).until(
    EC.element_to_be_clickable((MobileBy.ACCESSIBILITY_ID, "Search 
Wikipedia"))
)
search_element.click()

search_input = WebDriverWait(driver, 30).until(
    EC.element_to_be_clickable((MobileBy.ID, 
"org.wikipedia.alpha:id/search_src_text"))
)
search_input.send_keys("BrowserStack")
time.sleep(5)

search_results = 
driver.find_elements_by_class_name("android.widget.TextView")
assert(len(search_results) > 0)

driver.quit()

但我得到了以下错误：

Traceback (most recent call last):
  File "/Applications/Eclipse.app/Contents/MacOS/C:\EclipseWorkspaces\csse120/Browserstack/src/Sample/__init__.py", line 1, in <module>
    from Appium import webdriver
ModuleNotFoundError: No module named 'Appium'

我已经通过Marketplace在我的Eclipse IDE中设置了Appium，但是这个问题仍然没有解决。