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Re: [Configobj-develop] String literal in the configuration file
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From: Michael F. <fuz...@vo...> - 2009-03-07 23:52:00
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kat kat wrote:
>
>
> On Sat, Mar 7, 2009 at 5:41 AM, Michael Foord
> <fuz...@vo... <mailto:fuz...@vo...>> wrote:
>
> kat kat wrote:
> > Hello All,
> >
> > I need to retrieve a value of a key in the configuration file as
> a raw
> > string but somehow after ConfigObj reads it, it is escaping special
> > characters. For e.g, here is my configuration file:
> >
> > [ "constants" ]
> > 'target_dir' = r"C:\tmpdir"
> >
> > As you see above I have declared "target_dir" key's value to be
> a raw
> > string which should be evaluated literally, that is the backslash
> > present in the value should not be escaped.
>
> The raw string format is not valid ConfigObj syntax. This is what
> happens when I run your example:
>
> >>> open('cfg.txt', 'w').write("""[ "constants" ]
> ... 'target_dir' = r"C:\\tmpdir\"""")
> >>> from configobj import ConfigObj
> >>> c = ConfigObj('cfg.txt')
> >>> c['constants']['target_dir']
> 'r"C:\\tmpdir"'
> >>>
>
> See how the r is actually included in the value!
>
>
>
> Yes. I have seen that.
>
>
>
>
>
> If we remove the leading r from the string then as far as I can
> tell you
> get what you are asking for anyway?
>
> >>> open('cfg.txt', 'w').write("""[ "constants" ]
> ... 'target_dir' = "C:\\tmpdir\"""")
> >>> c = ConfigObj('cfg.txt')
> >>> c['constants']['target_dir']
> 'C:\\tmpdir'
>
> If you are asking for this: 'C:\tmpdir' then you are simply confused
> about how Python handles strings - there isn't really two
> backslashes in
> the string, there is one but it has to be escaped to be displayed.
>
>
>
> I understand that part. I know that 'C:\\tmpdir' has just one
> backslash, although since this is not a raw string you need the other
> backslash to escape the first one. See this:
>
> >>> str_a = 'C:\\tmpdir'
> >>> str_b = r'C:\tmpdir'
>
> The both are essentially same. If you print the above two:
>
> >>> print str_a
> 'C:\tmpdir'
>
> >> print str_b
> 'C:\tmpdir'
>
> As you see they both give the same output. Now see this:
>
> >>> str_c = 'C:\tmpdir'
> >> print str_c
> C: mpdir
>
> Which give the above and which is right because for python, it
> interprets \t as a tab character, which is special character, because
> "str_c" is not declared as a raw string. So I am not confused on that
> part.
>
> What I want essentially is, if we have the following in some
> configuration file:
>
> [constants]
>
> 'target_dir': r'C:\tmpdir'
>
That is not valid ConfigObj syntax. If you remove the leading r you get
what you want anyway. ConfigObj won't interpret \t as a tab character.
> then "target_dir" should be interpreted as a raw string and the module
> that is parsing this configuration file should not have a need of
> another backslash to escape the first one because its raw and should
> be interpreted literally. This works fine with ConfigParser though but
> my team ended up using ConfigObj.
>
> My point is this is a bug in ConfigObj if ConfigObj does not parse
> this right.
>
You're confusing Python syntax and ConfigObj syntax. They are different.
Michael
>
>
>
> Michael
>
> >
> > I am reading the file like this:
> >
> > >>> from configobj import ConfigObj
> > >>> config = ConfigObj("tmp.cfg")
> > >>> dir = config['constants']['target_dir']
> > >>> dir
> > 'C:\\tmpdir'
> >
> > although this is OK:
> > >>> print dir
> > 'C:\tmpdir'
> >
> > but when we do print, the string is evaluated.
> >
> > If you see, the backslash gets escaped and I no longer get the raw
> > string I had in my configuration file.
> >
> > What should I do so that ConfigObj reads that value as a raw string
> > and give me r"C:\tmpdir" instead of "C:\\tmpdir"
> >
> > Thanks much for your help
> >
> > -kk
> >
> >
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> -OSBC tackles the biggest issue in open source: Open Sourcing the Enterprise
> -Strategies to boost innovation and cut costs with open source participation
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