ImportError: cannot import name poll

[AbdullahAlshraa]

when I try to Launch SPIDER:

$ cd ~/spider/src
$ sudo ryu-manager SPIDER_ctrl_WEBAPP.py

I get

Traceback (most recent call last):
File "/usr/local/bin/ryu-manager", line 9, in
load_entry_point('ryu==3.29', 'console_scripts', 'ryu-manager')()
File "/usr/local/lib/python2.7/dist-packages/ryu/cmd/manager.py", line 88, in main
app_mgr.load_apps(app_lists)
File "/usr/local/lib/python2.7/dist-packages/ryu/base/app_manager.py", line 401, in load_apps
cls = self.load_app(app_cls_name)
File "/usr/local/lib/python2.7/dist-packages/ryu/base/app_manager.py", line 378, in load_app
mod = utils.import_module(name)
File "/usr/local/lib/python2.7/dist-packages/ryu/utils.py", line 91, in import_module
import(name)
File "/home/mininet/spider/src/SPIDER_ctrl_WEBAPP.py", line 25, in
import SPIDER_ctrl
File "/home/mininet/spider/src/SPIDER_ctrl.py", line 30, in
import SPIDER_parser
File "/home/mininet/spider/src/SPIDER_parser.py", line 33, in
from mininet.topo import Topo
File "build/bdist.linux-x86_64/egg/mininet/topo.py", line 14, in
File "build/bdist.linux-x86_64/egg/mininet/util.py", line 7, in
ImportError: cannot import name poll

how to handle with this situation

thanks in advance

[DavideSanvito]

Hi Abdullah,
try to execute the following command:
$ sudo pip install -I eventlet==0.17.4
Best,
Davide

[AbdullahAlshraa]

Thank you so much,
It works well.

[jwkim90]

This question and solution saved me, thank you very much!

[hangvane]

I had the same problem and this discuss saved me, thank you ! But I still want to know why eventlet=0.24.1 is unavailable but eventlet=0.18.4 is available for ryu=4.31

[DavideSanvito]

I'm glad you solved your issue! SPIDER has been built on top of OpenState, which is based on Ryu 3.
I'm sorry but I'm not able to answer your question because we did not try to test or support a different version of Ryu.

[chenmiaojie03]

why can‘t I operate pip install -I eventlet==0.17.4，it leave with error