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UnboundLocalError: local variable 'res' referenced before assignment

See original GitHub issue

I get an sporadically error/stacktrace after multiple use of the command “ykman slot calculate -T 2”. Have you any ideas why?

Python Version: 3.6.0 OS: macOS 10.12.3

➜  ~ ykman -v      
YubiKey Manager (ykman) version: 0.3.1
Libraries:
    libykpers 1.17.3
    libu2f-host 1.1.3
    libusb 1.0.21
➜  ~ ykman slot calculate -T 2
Touch your YubiKey...
722158
➜  ~ ykman slot calculate -T 2
Touch your YubiKey...
722158
➜  ~ ykman slot calculate -T 2
Touch your YubiKey...
Traceback (most recent call last):
  File "/usr/local/bin/ykman", line 11, in <module>
    sys.exit(main())
  File "/usr/local/lib/python3.6/site-packages/ykman/cli/__main__.py", line 116, in main
    cli(obj={})
  File "/usr/local/lib/python3.6/site-packages/click/core.py", line 722, in __call__
    return self.main(*args, **kwargs)
  File "/usr/local/lib/python3.6/site-packages/click/core.py", line 697, in main
    rv = self.invoke(ctx)
  File "/usr/local/lib/python3.6/site-packages/click/core.py", line 1066, in invoke
    return _process_result(sub_ctx.command.invoke(sub_ctx))
  File "/usr/local/lib/python3.6/site-packages/click/core.py", line 1066, in invoke
    return _process_result(sub_ctx.command.invoke(sub_ctx))
  File "/usr/local/lib/python3.6/site-packages/click/core.py", line 895, in invoke
    return ctx.invoke(self.callback, **ctx.params)
  File "/usr/local/lib/python3.6/site-packages/click/core.py", line 535, in invoke
    return callback(*args, **kwargs)
  File "/usr/local/lib/python3.6/site-packages/click/decorators.py", line 17, in new_func
    return f(get_current_context(), *args, **kwargs)
  File "/usr/local/lib/python3.6/site-packages/ykman/cli/slot.py", line 359, in calculate
    click.echo(res)
UnboundLocalError: local variable 'res' referenced before assignment

Issue Analytics

State:
Created 6 years ago
Comments:6 (4 by maintainers)

Top GitHub Comments

2reactions

dainnilssoncommented, Mar 29, 2017

The error handling does look wrong though. The inner try catches the error, but if the error code isn’t 4, it falls though to .echo(res) (which is undefined). it should give you a nicer error based on the error code from ykpers.

0reactions

dagheymancommented, Apr 21, 2017

The actual error should be printed now, feel free to install ykman from the repo or wait for the next release to try it out.

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