do 'os.path' include 'os' for us?

[Jerry Fleming]

Hi,

I wrote a python script to list files in a directory but somehow did it 
wrongly by importing os.path instead of os. To my astonishment, it works 
just as charm:
#!/usr/bin/python
import os.path
for file in os.listdir('/root/'):
        print file

I was wondering why? os.path doesn't contain listdir, why there is no 
complaint like 'os: unknown name'? Does this mean, instead of importing 
os, we can import os.path?

Thanks.
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