.
 app
 base
 cfg.py
 cfg.pyc
 cmd
 contrib
 controller
 exception.py
 exception.pyc
 flags.py
 flags.pyc
 hooks.py
 hooks.pyc
 __init__.py
 __init__.pyc
 lib
 log.py
 log.pyc
 ofproto
 services
 tests
 topology
 utils.py
 utils.pyc

ryu directory are shown above. Enter ryu-manager prompt without command? Excuse me, what"s going on? The installation of ryu is completed in the form of pip install ryu .