hai,
        i am executing simple programs from Ryu book..simple_switch,traffic
monitoring...i am getting the following error.
       how to resolve this error..anyone pls tell me.

loading app ryu.app.simple_switch_12.py
Traceback (most recent call last):
  File "/usr/local/bin/ryu-manager", line 9, in <module>
    load_entry_point('ryu==4.30', 'console_scripts', 'ryu-manager')()
  File "/usr/local/lib/python2.7/dist-packages/ryu/cmd/manager.py", line
98, in main
    app_mgr.load_apps(app_lists)
  File "/usr/local/lib/python2.7/dist-packages/ryu/base/app_manager.py",
line 415, in load_apps
    cls = self.load_app(app_cls_name)
  File "/usr/local/lib/python2.7/dist-packages/ryu/base/app_manager.py",
line 392, in load_app
    mod = utils.import_module(name)
  File "/usr/local/lib/python2.7/dist-packages/ryu/utils.py", line 108, in
import_module
    return importlib.import_module(modname)
  File "/usr/lib/python2.7/importlib/__init__.py", line 37, in import_module
    __import__(name)
ImportError: No module named py


-- 
Thanks & Regards,
P.Suguna
Mobile:9894549016
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