I was once stucked in How to check Whether a Python module has been installed or not. After Googling, I found this trick.
Python allows user to pass command from out of a python file.See here
-c cmd : program passed in as string (terminates option list)
The result if we import an installed module
20:15:45-androidyue~/osc_git/LnxClient (master)$ python -c "import os"20:31:24-androidyue~/osc_git/LnxClient (master)$ echo$?0
#0 means the module has been installed
Now if we import an module which is not installed.
20:31:41-androidyue~/osc_git/LnxClient (master)$ python -c "import aaa"Traceback (most recent call last):
File "<string>", line 1, in <module>
ImportError: No module named aaa
20:31:46-androidyue~/osc_git/LnxClient (master)$ echo$?1
#1 means that module is not installed.