I encounter a critical issue when writing vim script using python, for example 
the code is as below:

def func():
    try:    
        while 1:
            xxx
            xxx
    except KeyboardInterrupt:
        pass

    vim.command("xxxx")

I press ctrl-c to interrupt the program, after KeyboardInterrupt is raised, 
vim.command() always throw an exception,which is KeyboardInterrupt in vim7.3 
and vim.error in vim7.4.

I want to use "signal.signal(signal.SIGINT, signal.SIG_IGN)" to ignore 
SIGINT,but it doesn't work.

Any one knows this issue?

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