Hello all!
I have been trying to work through the tutorial shown in the Ryu github site,
using a new Ubuntu 16.04.3 VM and trying to follow the installation
instructions given (including the optional-requires). There have been a lot of
problems with getting pip to install Ryu correctly and to load all of the
prerequisites, so I am suspicious that there is something wrong with the
configuration of the ryu-manager. Right now, where I am at is at the first
attempt to execute the tutorial's example_switch_13 code. This fails with the
following error:
root@laura-XPS-8500:~# ryu-manager --verbose ryu/ryu/app/example_switch_13
lzma module is not available
Registered VCS backend: git
Registered VCS backend: hg
Registered VCS backend: svn
Registered VCS backend: bzr
loading app ryu/ryu/app/example_switch_13
Traceback (most recent call last):
File "/usr/local/bin/ryu-manager", line 11, in <module>
load_entry_point('ryu==4.16', 'console_scripts', 'ryu-manager')()
File "/home/laura/.local/lib/python2.7/site-packages/ryu/cmd/manager.py",
line 98, in main
app_mgr.load_apps(app_lists)
File
"/home/laura/.local/lib/python2.7/site-packages/ryu/base/app_manager.py", line
415, in load_apps
cls = self.load_app(app_cls_name)
File
"/home/laura/.local/lib/python2.7/site-packages/ryu/base/app_manager.py", line
392, in load_app
mod = utils.import_module(name)
File "/home/laura/.local/lib/python2.7/site-packages/ryu/utils.py", line 110,
in import_module
return importlib.import_module(modname)
File "/usr/lib/python2.7/importlib/__init__.py", line 37, in import_module
__import__(name)
ImportError: Import by filename is not supported.
Googling the error, I see that "import by filename" is not supported by Python
2.7 (the native Python in Ubuntu for ages). So I'm not clear where to go from
here?
Thanks for your help,
Laura
PS: I resolved the "lzma module is not available" by running sudo apt-get
install python-lzma. Apparently Python 2.7 doesn't come with an LZMA module
native, and this was not included as a prerequisite under pip installation or
in the optional-requires. I'm not sure if that was the "correct" version of
LZMA to install or whether pyliblzma was the "correct" one.
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