ryu写py文件遇到的问题

1：
在ryu中的app中导入一个新的包时，要先用python 将其中的py文件执行一遍，生成.pyc文件，否则直接
ryu-manager xx 文件.py会显示找不到包的错误，可能用python执行一遍的时候会自动记录新包的路径，否则直接ryu-manager，就会报错说找不到这个新导入的模块
2：
root@eb73808fd133:~/ryu/ryu/app# ryu-manager haha.py
loading app haha.py
Traceback (most recent call last):
  File "/usr/local/bin/ryu-manager", line 9, in
    load_entry_point('ryu==4.31', '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 104, 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 haha.py         要先执行python haha.py
root@eb73808fd133:~/ryu/ryu/app#
root@eb73808fd133:~/ryu/ryu/app#
root@eb73808fd133:~/ryu/ryu/app#
root@eb73808fd133:~/ryu/ryu/app#
root@eb73808fd133:~/ryu/ryu/app#
root@eb73808fd133:~/ryu/ryu/app# python haha.py
  File "haha.py", line 36
    print(msg)                                        缩进问题
    ^
IndentationError: unexpected indent
root@eb73808fd133:~/ryu/ryu/app#
root@eb73808fd133:~/ryu/ryu/app#
3：
root@eb73808fd133:~/ryu/ryu/app# ryu-manager haha.py
loading app haha.py
loading app ryu.controller.ofp_handler
instantiating app haha.py of ARP_PROXY_13
instantiating app ryu.controller.ofp_handler of OFPHandler
hub: uncaught exception: Traceback (most recent call last):
  File "/usr/local/lib/python2.7/dist-packages/ryu/lib/hub.py", line 60, in _launch
    return func(*args, **kwargs)
  File "/usr/local/lib/python2.7/dist-packages/ryu/controller/controller.py", line 202, in server_loop
    datapath_connection_factory)
  File "/usr/local/lib/python2.7/dist-packages/ryu/lib/hub.py", line 127, in __init__
    self.server = eventlet.listen(listen_info)
  File "/usr/lib/python2.7/dist-packages/eventlet/convenience.py", line 43, in listen
    sock.bind(addr)
  File "/usr/lib/python2.7/socket.py", line 228, in meth
    return getattr(self._sock,name)(*args)
error: [Errno 98] Address already in use

hub: uncaught exception: Traceback (most recent call last):
  File "/usr/local/lib/python2.7/dist-packages/ryu/lib/hub.py", line 60, in _launch
    return func(*args, **kwargs)
  File "/usr/local/lib/python2.7/dist-packages/ryu/controller/controller.py", line 153, in __call__
    self.ofp_ssl_listen_port)
  File "/usr/local/lib/python2.7/dist-packages/ryu/controller/controller.py", line 202, in server_loop
    datapath_connection_factory)
  File "/usr/local/lib/python2.7/dist-packages/ryu/lib/hub.py", line 127, in __init__
    self.server = eventlet.listen(listen_info)
  File "/usr/lib/python2.7/dist-packages/eventlet/convenience.py", line 43, in listen
    sock.bind(addr)
  File "/usr/lib/python2.7/socket.py", line 228, in meth
    return getattr(self._sock,name)(*args)
error: [Errno 98] Address already in use

root@eb73808fd133:~/ryu/ryu/app#

解决方法：root@eb73808fd133:~/ryu/ryu/app# ryu-manager --verbose haha.py gui_topology/gui_topology.py --observe-links