vim - error during startup - "E858: Eval did not return a valid python object" about powerline HOT 4 CLOSED

Please before posting such reports use either new patch (hope it gets applied soon) or change if exists('*pyeval') to if 0&&exists('*pyeval') in powerline/ext/vim/powerline.vim. There is exactly no way we can deduce what happens here without knowing either full environment (steps how to reproduce the problem starting from vim -u NONE is likely to be enough; using real full environment information will require too much effort to reproduce the problem if it is not obvious from the vim -u NONE steps) or the stack trace (printed with the patch or when using compatibility function: this is what I described in first sentence). I guess this information needs to be added to troubleshooting section.

In any case, even if there was stack trace, do post bug reports for any vim plugin that contain sentences like “When doing vim -u NONE --cmd 'python from powerline import …', vim displays errors”. “Error during startup” expressed here is almost never helpful (especially without good stack traces which are not available for pure VimL plugins; and for pyeval()): if this happened on developer’s machines they would have already known. If this did not happen, they begin to know nothing except that “it does not work on @trevor’s machine”.

The only thing I can currently suggest is doing mv ~/.config/powerline{.bak} (if ~/.config/powerline exists) and git reset --hard HEAD in powerline repository. If this helps your issue is not our issue, but issue with your configuration.

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Please check out the solution in #37 as well. A recent change of some file locations may be the cause of this error, and a clean checkout could hopefully resolve your issue. I'll close this, please open a new issue with full error messages if you still experience any problems after trying the solution.

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substituted for if 0&&exists('*pyeval')

Executing BufWinEnter Auto commands for "*"
autocommand call s:UpdateWindows()

Error detected while processing function <SNR>11_UpdateWindows..<SNR>11_pyeval:
line    1:
Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "<string>", line 1, in <module>
  File "/usr/local/Cellar/python/2.7.3/Frameworks/Python.framework/Versions/2.7/lib/python2.7/uuid.py", line 545, in uuid4
    import random
  File "/usr/local/Cellar/python/2.7.3/Frameworks/Python.framework/Versions/2.7/lib/python2.7/random.py", line 47, in <module>
    from os import urandom as _urandom
ImportError: cannot import name urandom
Executing BufWinEnter Auto commands for "*"
autocommand call s:UpdateWindows()

function uuid4 in uuid.py:

def uuid4():
    """Generate a random UUID."""

    # When the system provides a version-4 UUID generator, use it.
    if _uuid_generate_random:
        _buffer = ctypes.create_string_buffer(16)
        _uuid_generate_random(_buffer)
        return UUID(bytes=_buffer.raw)

    # Otherwise, get randomness from urandom or the 'random' module.
    try:
        import os
        return UUID(bytes=os.urandom(16), version=4)
    except:
        import random
        bytes = [chr(random.randrange(256)) for i in range(16)]
        return UUID(bytes=bytes, version=4)

it appears to catching an exception when os.urandom(16) is run when originally called by s:pyeval('str(uuid.uuid4())'). issue isn't present in python repl.

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this solved it python-mode/python-mode#87 (comment)

thanks

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