sys.path seems not working at all

[tian-yan]

file is already in sys.path, however, when I set breakpoint on it, pdb++ still can not find the file.

(Pdb++) pp sys.path
['/usr/src/app',
 '/usr/local/bin',
 '/usr/local/lib/python3.7/site-packages/_pdbpp_path_hack',
 '/usr/local/lib/python37.zip',
 '/usr/local/lib/python3.7',
 '/usr/local/lib/python3.7/lib-dynload',
 '/usr/local/lib/python3.7/site-packages',
 '/root/Django/IoTSite/IoTSite/',
 '/root/Django/IoTSite/IoTSite/urls.py']
(Pdb++) b urls.py:39
*** 'urls.py' not found from sys.path
(Pdb++) 

[blueyed]

What Python version is this? (does it work with plain pdb there?)
Also try with pdb++ from Git master - IIRC there have been fixes in this regard there.