Unable to run scrapy shell after installing iPython

[DarkStar1]

I am just getting into python because of scrapy and I had been using scrapy shell just fine, then I installed iPython (5.3.0). Since then whenever I try to use scrapy shell i get the following error message:

File "/Users/mydevuser/.virtualenvs/sample/bin/scrapy", line 11, in <module>
    sys.exit(execute())
  File "/Users/mydevuser/.virtualenvs/sample/lib/python3.6/site-packages/scrapy/cmdline.py", line 149, in execute
    _run_print_help(parser, _run_command, cmd, args, opts)
  File "/Users/mydevuser/.virtualenvs/sample/lib/python3.6/site-packages/scrapy/cmdline.py", line 89, in _run_print_help
    func(*a, **kw)
  File "/Users/mydevuser/.virtualenvs/sample/lib/python3.6/site-packages/scrapy/cmdline.py", line 156, in _run_command
    cmd.run(args, opts)
  File "/Users/mydevuser/.virtualenvs/sample/lib/python3.6/site-packages/scrapy/commands/shell.py", line 73, in run
    shell.start(url=url, redirect=not opts.no_redirect)
  File "/Users/mydevuser/.virtualenvs/sample/lib/python3.6/site-packages/scrapy/shell.py", line 81, in start
    banner=self.vars.pop('banner', ''))
  File "/Users/mydevuser/.virtualenvs/sample/lib/python3.6/site-packages/scrapy/utils/console.py", line 82, in start_python_console
    shell(namespace=namespace, banner=banner)
  File "/Users/mydevuser/.virtualenvs/sample/lib/python3.6/site-packages/scrapy/utils/console.py", line 22, in wrapper
    banner1=banner, user_ns=namespace, config=config)
  File "/Users/mydevuser/.virtualenvs/sample/lib/python3.6/site-packages/traitlets/config/configurable.py", line 423, in instance
    '%s are being created.' % cls.__name__
traitlets.config.configurable.MultipleInstanceError: Multiple incompatible subclass instances of InteractiveShellEmbed are being created.

[Carreau]

Well that's likely a scrappy issue. You can't create multiple instance of IPython Shell which you can't do.

That might also be something on your machine (custom configuration ?) as this seem to work fine for me locally.

[DarkStar1]

@Carreau Thanks. I'll see what the scrappy Forum has to say about it.