执行MonkeyRunner.alert范例报错了，请问老师是什么原因呢？
#!/user/bin/python
from com.android.monkeyrunner import MonkeyRunner
MonkeyRunner.alert('Hello mook friends','This is title','OK')
D:\mywork\monkey>python demo.py
Traceback (most recent call last):
File "demo.py", line 2, in <module>
from com.android.monkeyrunner import MonkeyRunner
ImportError: No module named 'com'
D:\mywork\monkey>
