Re: [Configobj-develop] ConfigObj drops quotes sometimes

[Jeffrey B. <jef...@ea...>]

On Friday 16 January 2009 04:07:43 Michael Foord wrote:
> Jeffrey Barish wrote:
> > On Monday 12 January 2009 08:16:57 Michael Foord wrote:
> >> Jeffrey Barish wrote:
> >>> I write the repr of a tuple to my configuration file on exit.  Usually,
> >>> I find "<tuple>" in my configuration file afterward, but occasionally
> >>> the quotation marks are missing.  I have not been able to detect a
> >>> pattern. Any suggestions?
> >>
> >> Is it actually causing any problems?
> >
> > Or worse: If the value in the configuration file is
> >
> > ('a', ['b', 'c'])
> >
> > then I get a ParseError (at line 8) when I try to read it.  That error I
> > cannot fix.
> >
> > BTW, I am using version 4.5.3.
>
> Did you have any luck reproducing this?
>
> Michael

I finally figured out what was going on here, but I am still unclear about one 
point.  In my configuration file, I have a line like

atuple = "('a', ['b', 'c'])"

I created a validator for the purpose of converting that string to a tuple.  
The problem arises when I call the write method because a tuple gets written 
back to the configuration file rather than a repr of a tuple.  I suspect that 
configobj is working the way it is supposed to work, but what I wanted was to 
be handed a tuple yet still have the write method write the repr of the 
tuple.  Currently, I have turned off the conversion in the validator and 
instead perform the conversion in my program.  I am not happy that I must 
have eval's scattered throughout my code to perform the conversion previously 
performed centrally in the validator.  I'm wondering whether there is a way 
to restore the conversion provided in the validator but still have the write 
method write the value in its original form.

FWIW, here's a test program configtest.py:

import configobj, validate, os

CONFIGRC = os.path.join(os.getcwd(), 'configrc')

class Configurator(configobj.ConfigObj):
    def __init__(self):
        configobj.ConfigObj.__init__(self, CONFIGRC, 
configspec=CONFIGRC+'.spec')
        val = validate.Validator({'check_tuple': self._tuple_validator})
        res = self.validate(val, preserve_errors=True)

    def _tuple_validator(self, val, default=None):
        return eval(val)
        #return val

if __name__ == '__main__':
    config = Configurator()
    config.write()

configrc:

atuple = "('One', ['Two'])"

configrc.spec:

atuple = check_tuple()

-- 
Jeffrey Barish