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WordCompleter docs example throws AssertionError

See original GitHub issue

Hello,

I am using version 2.0.7 with python 2.7

~/programming/card-game-maxeta % pip install prompt_toolkit
Requirement already satisfied: prompt_toolkit in /Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages (2.0.7)
Requirement already satisfied: wcwidth in /Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages (from prompt_toolkit) (0.1.7)
Requirement already satisfied: six>=1.9.0 in /Library/Python/2.7/site-packages (from prompt_toolkit) (1.11.0)

and I am running the python file pt_fun.py whose contents is

from prompt_toolkit import prompt
from prompt_toolkit.completion import WordCompleter

html_completer = WordCompleter(['<html>', '<body>', '<head>', '<title>'])
text = prompt('Enter HTML: ', completer=html_completer)
print('You said: %s' % text)

which is verbatim what is shown in the stable and 2.0.7 docs.

It throws the error:

~/programming/card-game-maxeta % python pt_fun.py
Traceback (most recent call last):
  File "pt_fun.py", line 5, in <module>
    text = prompt('Enter HTML: ', completer=html_completer)
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/prompt_toolkit/shortcuts/prompt.py", line 840, in prompt
^[[32;1R    return session.prompt(*a, **kw)
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/prompt_toolkit/shortcuts/prompt.py", line 733, in prompt
    return run_sync()
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/prompt_toolkit/shortcuts/prompt.py", line 722, in run_sync
    return self.app.run(inputhook=self.inputhook, pre_run=pre_run2)
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/prompt_toolkit/application/application.py", line 699, in run
    return run()
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/prompt_toolkit/application/application.py", line 673, in run
    return f.result()
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/prompt_toolkit/eventloop/future.py", line 149, in result
    raise self._exception
AssertionError

Thank you, Matthew

Issue Analytics

State:
Created 5 years ago
Comments:7 (3 by maintainers)

Top GitHub Comments

1reaction

jonathanslenderscommented, Dec 19, 2018

@MareoRaft: in your example the error is that the prompt string is not a unicode object but str (in Python 2). Try to put a lowercase u in front of the string:

text = prompt(u'Enter HTML: ', completer=html_completer)

The error message is not clear indeed. We have to fix that.

0reactions

MareoRaftcommented, Jan 6, 2019

@jonathanslenders Please feel free to reopen if you want to use this ticket to make sure the error message gets updated. Like you said, it really should be a better error message.