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ivanov / vim-ipython

A two-way integration between Vim and IPython 0.11+
http://github.com/ivanov/vim-ipython
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IPython.config.configurable.MultipleInstanceError when trying to connect vim-ipython a second tim #79

Open eyalfir opened 10 years ago

eyalfir commented 10 years ago

After restarting the ipython kernel I try reconnecting with :IPython I get an error from find_connection_file: Traceback (most recent call last): File "", line 1, in File "", line 117, in km_from_string File "/usr/local/lib/python2.7/dist-packages/IPython/kernel/connect.py", line 202, in find_connection_file app = IPApp.instance() File "/usr/local/lib/python2.7/dist-packages/IPython/config/configurable.py", line 360, in instance '%s are being created.' % cls.name IPython.config.configurable.MultipleInstanceError: Multiple incompatible subclass instances of BaseIPythonApplication are being crea ted.

blueyed commented 10 years ago

Confirmed. This also happens when you stop the ipython kernel, and use :IPython again.

eyalfir commented 10 years ago

The errors occurs in this line

fullpath = find_connection_file(s.lstrip().rstrip())

Find_connection_file is IPython.lib.kernel.find_connection_file. The error occurs, in my observations, only when 

s.lstrip().rstrip() == ''

I've implemented my own variant of "find_connection_file" the second time as a wolkaround:

    global km, kc, send, Empty, kernel_dir

    # I added this to circumvent a bug in python 2.7.3 where find_connection_file('')
    # fails if invoked after kc.start_channels() - ef
    import os
    if not s and not kernel_dir:
        s = find_connection_file("")
        kernel_dir = os.path.dirname(s)
    elif not s and kernel_dir:
        files = [os.path.join(kernel_dir,x) for x in os.listdir(kernel_dir)]
        stats = {}
        for f in files:
            stats[f] = os.stat(f)
        max_mtime = max([x.st_mtime for x in stats.values()])
        options = [x for x,y in stats.items() if y.st_mtime==max_mtime]
        if len(options)==1:
            s = options[0]
    print s
    #### end of change

this work-around looks for the kernel connection json with the most recent creation json in the same directory that the first call to :IPython found.

pag commented 10 years ago

This bug is really annoying -- when my IPython kernel dies I have to restart vim. Can you please fix this?

ibayer commented 10 years ago

@Eyalfir Thanks for bringing this up! I spend quite some time looking for a reasons why I can't connect to the ipython console even through it worked at first. Did you consider opening a PR with your solution?