Newbie question: non-escaping backslashes before placeholders

[Jon Mills-3]

Hi,

I'm new to Cheetah, and new to this list,

I've got a question that I'm sure must have been asked before, but I
can't find the answer in the documentation so I'm hoping somebody can
help.

I'm using Cheetah 2.2.1 / Python 2.5 under Windows to create some
config files and I'm having problems creating windows paths.

There's a cut-down example below.

from Cheetah.Template import Template
t = Template('#config_file    "c:\$p1\$p2"')
t.p1 = 'foo'
t.p2 = 'bar'
print t

This outputs the following:
    #config_file    "c:$p1$p2"

What I really want is
    #config_file    "c:\foo\bar"

I can't figure out how to prevent the backslashes from escaping the
following placeholder. I'm sure there's a simple answer.

Thanks in advance.

Jon Mills
jonmills@...

------------------------------------------------------------------------------
Come build with us! The BlackBerry(R) Developer Conference in SF, CA
is the only developer event you need to attend this year. Jumpstart your
developing skills, take BlackBerry mobile applications to market and stay
ahead of the curve. Join us from November 9 - 12, 2009. Register now!
http://p.sf.net/sfu/devconference
_______________________________________________
Cheetahtemplate-discuss mailing list
Cheetahtemplate-discuss@...
https://lists.sourceforge.net/lists/listinfo/cheetahtemplate-discuss

[tyler-53]

On Thu, 22 Oct 2009, Jon Mills wrote:

> Hi,
>
> I'm new to Cheetah, and new to this list,
>
> I've got a question that I'm sure must have been asked before, but I
> can't find the answer in the documentation so I'm hoping somebody can
> help.
>
> I'm using Cheetah 2.2.1 / Python 2.5 under Windows to create some
> config files and I'm having problems creating windows paths.
>
> There's a cut-down example below.
>
> from Cheetah.Template import Template
> t = Template('#config_file    "c:\$p1\$p2"')
> t.p1 = 'foo'
> t.p2 = 'bar'
> print t

If you wrap them in curly braces you should be fine, i.e.

        "c:\${p1}\${p2}"

Let me know if that doesn't work for you

Cheers,
-R. Tyler Ballance
--------------------------------------
 GitHub: http://github.com/rtyler
Twitter: http://twitter.com/agentdero
   Blog: http://unethicalblogger.com


------------------------------------------------------------------------------
Come build with us! The BlackBerry(R) Developer Conference in SF, CA
is the only developer event you need to attend this year. Jumpstart your
developing skills, take BlackBerry mobile applications to market and stay
ahead of the curve. Join us from November 9 - 12, 2009. Register now!
http://p.sf.net/sfu/devconference
_______________________________________________
Cheetahtemplate-discuss mailing list
Cheetahtemplate-discuss@...
https://lists.sourceforge.net/lists/listinfo/cheetahtemplate-discuss

[Jon Mills-3]

Tyler,

Thanks for your quick response, unfortunately that doesn't seem to fix
the problem.

If I change my test code to:
from Cheetah.Template import Template
t = Template('#config_file    "c:\${p1}\${p2}"')
t.p1 = 'foo'
t.p2 = 'bar'
print t

I get the following output:
#config_file    "c:${p1}${p2}"

On Thu, Oct 22, 2009 at 8:00 AM,  <tyler@...> wrote:

>
> On Thu, 22 Oct 2009, Jon Mills wrote:
>
>> Hi,
>>
>> I'm new to Cheetah, and new to this list,
>>
>> I've got a question that I'm sure must have been asked before, but I
>> can't find the answer in the documentation so I'm hoping somebody can
>> help.
>>
>> I'm using Cheetah 2.2.1 / Python 2.5 under Windows to create some
>> config files and I'm having problems creating windows paths.
>>
>> There's a cut-down example below.
>>
>> from Cheetah.Template import Template
>> t = Template('#config_file    "c:\$p1\$p2"')
>> t.p1 = 'foo'
>> t.p2 = 'bar'
>> print t
>
> If you wrap them in curly braces you should be fine, i.e.
>
>        "c:\${p1}\${p2}"
>
> Let me know if that doesn't work for you
>
> Cheers,
> -R. Tyler Ballance
> --------------------------------------
>  GitHub: http://github.com/rtyler
> Twitter: http://twitter.com/agentdero
>   Blog: http://unethicalblogger.com
>

--
Jon Mills
jonmills@...

------------------------------------------------------------------------------
Come build with us! The BlackBerry(R) Developer Conference in SF, CA
is the only developer event you need to attend this year. Jumpstart your
developing skills, take BlackBerry mobile applications to market and stay
ahead of the curve. Join us from November 9 - 12, 2009. Register now!
http://p.sf.net/sfu/devconference
_______________________________________________
Cheetahtemplate-discuss mailing list
Cheetahtemplate-discuss@...
https://lists.sourceforge.net/lists/listinfo/cheetahtemplate-discuss

[tyler-53]

On Thu, 22 Oct 2009, Jon Mills wrote:

> Tyler,
>
> Thanks for your quick response, unfortunately that doesn't seem to fix
> the problem.
>
> If I change my test code to:
> from Cheetah.Template import Template
> t = Template('#config_file    "c:\${p1}\${p2}"')
> t.p1 = 'foo'
> t.p2 = 'bar'
> print t
>
> I get the following output:
> #config_file    "c:${p1}${p2}"

Ah right, I'm daft, the backslash is escaping the dollarsign.

I don't think there's a really good means of dealing with this sort of
usecase to be honest, you could work around it for now by doing
something like:

        #set cpath = "c:\\%s\\%s" % ($p1, $p2)
        \#config_file   "$cpath"

Less than ideal, I agree, but will at least get you going until I
have time to dig into the compiler code


Cheers,
-R. Tyler Ballance
--------------------------------------
 GitHub: http://github.com/rtyler
Twitter: http://twitter.com/agentdero
   Blog: http://unethicalblogger.com

> On Thu, Oct 22, 2009 at 8:00 AM,  <tyler@...> wrote:
> >
> > On Thu, 22 Oct 2009, Jon Mills wrote:
> >
> >> Hi,
> >>
> >> I'm new to Cheetah, and new to this list,
> >>
> >> I've got a question that I'm sure must have been asked before, but I
> >> can't find the answer in the documentation so I'm hoping somebody can
> >> help.
> >>
> >> I'm using Cheetah 2.2.1 / Python 2.5 under Windows to create some
> >> config files and I'm having problems creating windows paths.
> >>
> >> There's a cut-down example below.
> >>
> >> from Cheetah.Template import Template
> >> t = Template('#config_file    "c:\$p1\$p2"')
> >> t.p1 = 'foo'
> >> t.p2 = 'bar'
> >> print t
> >
> > If you wrap them in curly braces you should be fine, i.e.
> >
> >        "c:\${p1}\${p2}"
> >
> > Let me know if that doesn't work for you

------------------------------------------------------------------------------
Come build with us! The BlackBerry(R) Developer Conference in SF, CA
is the only developer event you need to attend this year. Jumpstart your
developing skills, take BlackBerry mobile applications to market and stay
ahead of the curve. Join us from November 9 - 12, 2009. Register now!
http://p.sf.net/sfu/devconference
_______________________________________________
Cheetahtemplate-discuss mailing list
Cheetahtemplate-discuss@...
https://lists.sourceforge.net/lists/listinfo/cheetahtemplate-discuss

[Jon Mills-3]

Thanks Tyler, that works fine. It hadn't occurred to my that I could
use Python's string formatting as well as Cheetah's.

Great support. Thanks again.

On Thu, Oct 22, 2009 at 8:31 AM,  <tyler@...> wrote:

>
> On Thu, 22 Oct 2009, Jon Mills wrote:
>
>> Tyler,
>>
>> Thanks for your quick response, unfortunately that doesn't seem to fix
>> the problem.
>>
>> If I change my test code to:
>> from Cheetah.Template import Template
>> t = Template('#config_file    "c:\${p1}\${p2}"')
>> t.p1 = 'foo'
>> t.p2 = 'bar'
>> print t
>>
>> I get the following output:
>> #config_file    "c:${p1}${p2}"
>
>
> Ah right, I'm daft, the backslash is escaping the dollarsign.
>
> I don't think there's a really good means of dealing with this sort of
> usecase to be honest, you could work around it for now by doing
> something like:
>
>        #set cpath = "c:\\%s\\%s" % ($p1, $p2)
>        \#config_file   "$cpath"
>
> Less than ideal, I agree, but will at least get you going until I
> have time to dig into the compiler code
>
>
> Cheers,
> -R. Tyler Ballance
> --------------------------------------
>  GitHub: http://github.com/rtyler
> Twitter: http://twitter.com/agentdero
>   Blog: http://unethicalblogger.com
>> On Thu, Oct 22, 2009 at 8:00 AM,  <tyler@...> wrote:
>> >
>> > On Thu, 22 Oct 2009, Jon Mills wrote:
>> >
>> >> Hi,
>> >>
>> >> I'm new to Cheetah, and new to this list,
>> >>
>> >> I've got a question that I'm sure must have been asked before, but I
>> >> can't find the answer in the documentation so I'm hoping somebody can
>> >> help.
>> >>
>> >> I'm using Cheetah 2.2.1 / Python 2.5 under Windows to create some
>> >> config files and I'm having problems creating windows paths.
>> >>
>> >> There's a cut-down example below.
>> >>
>> >> from Cheetah.Template import Template
>> >> t = Template('#config_file    "c:\$p1\$p2"')
>> >> t.p1 = 'foo'
>> >> t.p2 = 'bar'
>> >> print t
>> >
>> > If you wrap them in curly braces you should be fine, i.e.
>> >
>> >        "c:\${p1}\${p2}"
>> >
>> > Let me know if that doesn't work for you
>

--
Jon Mills
jonmills@...
Sent from Stoke Gifford, South Gloucestershire, United Kingdom

------------------------------------------------------------------------------
Come build with us! The BlackBerry(R) Developer Conference in SF, CA
is the only developer event you need to attend this year. Jumpstart your
developing skills, take BlackBerry mobile applications to market and stay
ahead of the curve. Join us from November 9 - 12, 2009. Register now!
http://p.sf.net/sfu/devconference
_______________________________________________
Cheetahtemplate-discuss mailing list
Cheetahtemplate-discuss@...
https://lists.sourceforge.net/lists/listinfo/cheetahtemplate-discuss

[Aahz]

On Thu, Oct 22, 2009, Jon Mills wrote:
>
> from Cheetah.Template import Template
> t = Template('#config_file    "c:\$p1\$p2"')

t = Template('#config_file    r"c:\$p1\$p2"')

Note the 'r"' above -- I haven't tested that, though.  It might need to
be instead
t = Template(r'#config_file    "c:\$p1\$p2"')
or even both
t = Template(r'#config_file    r"c:\$p1\$p2"')
--
Aahz (aahz@...)           <*>         http://www.pythoncraft.com/

Member of the Groucho Marx Fan Club  

------------------------------------------------------------------------------
Come build with us! The BlackBerry(R) Developer Conference in SF, CA
is the only developer event you need to attend this year. Jumpstart your
developing skills, take BlackBerry mobile applications to market and stay
ahead of the curve. Join us from November 9 - 12, 2009. Register now!
http://p.sf.net/sfu/devconference
_______________________________________________
Cheetahtemplate-discuss mailing list
Cheetahtemplate-discuss@...
https://lists.sourceforge.net/lists/listinfo/cheetahtemplate-discuss

[Tavis Rudd]

I can't think of any 'pretty' way to do it, but here's another approach:

>>> print Template(r'''#config_file "$('c:\\%s\\%s'%($p1,$p2))"''',
...                namespaces={'p1':'foo', 'p2':'bar'})
#config_file "c:\foo\bar"

Template(r"#config_file $('\\%s\\%s'%($p1,$p2))")

On Thu, 22 Oct 2009, Jon Mills wrote:

> Thanks Tyler, that works fine. It hadn't occurred to my that I could
> use Python's string formatting as well as Cheetah's.
>
> Great support. Thanks again.
>
> On Thu, Oct 22, 2009 at 8:31 AM,  <tyler@...> wrote:
>>
>> On Thu, 22 Oct 2009, Jon Mills wrote:
>>
>>> Tyler,
>>>
>>> Thanks for your quick response, unfortunately that doesn't seem to fix
>>> the problem.
>>>
>>> If I change my test code to:
>>> from Cheetah.Template import Template
>>> t = Template('#config_file    "c:\${p1}\${p2}"')
>>> t.p1 = 'foo'
>>> t.p2 = 'bar'
>>> print t
>>>
>>> I get the following output:
>>> #config_file    "c:${p1}${p2}"
>>
>>
>> Ah right, I'm daft, the backslash is escaping the dollarsign.
>>
>> I don't think there's a really good means of dealing with this sort of
>> usecase to be honest, you could work around it for now by doing
>> something like:
>>
>>        #set cpath = "c:\\%s\\%s" % ($p1, $p2)
>>        \#config_file   "$cpath"

There's no need to escape #config_file.

>>
>> Less than ideal, I agree, but will at least get you going until I
>> have time to dig into the compiler code
>>
>>
>> Cheers,
>> -R. Tyler Ballance
>> --------------------------------------
>>  GitHub: http://github.com/rtyler
>> Twitter: http://twitter.com/agentdero
>>   Blog: http://unethicalblogger.com
>>> On Thu, Oct 22, 2009 at 8:00 AM,  <tyler@...> wrote:
>>>>
>>>> On Thu, 22 Oct 2009, Jon Mills wrote:
>>>>
>>>>> Hi,
>>>>>
>>>>> I'm new to Cheetah, and new to this list,
>>>>>
>>>>> I've got a question that I'm sure must have been asked before, but I
>>>>> can't find the answer in the documentation so I'm hoping somebody can
>>>>> help.
>>>>>
>>>>> I'm using Cheetah 2.2.1 / Python 2.5 under Windows to create some
>>>>> config files and I'm having problems creating windows paths.
>>>>>
>>>>> There's a cut-down example below.
>>>>>
>>>>> from Cheetah.Template import Template
>>>>> t = Template('#config_file    "c:\$p1\$p2"')
>>>>> t.p1 = 'foo'
>>>>> t.p2 = 'bar'
>>>>> print t
>>>>
>>>> If you wrap them in curly braces you should be fine, i.e.
>>>>
>>>>        "c:\${p1}\${p2}"
>>>>
>>>> Let me know if that doesn't work for you
>>
>
>
>
> --
> Jon Mills
> jonmills@...
> Sent from Stoke Gifford, South Gloucestershire, United Kingdom
>
> ------------------------------------------------------------------------------
> Come build with us! The BlackBerry(R) Developer Conference in SF, CA
> is the only developer event you need to attend this year. Jumpstart your
> developing skills, take BlackBerry mobile applications to market and stay
> ahead of the curve. Join us from November 9 - 12, 2009. Register now!
> http://p.sf.net/sfu/devconference
> _______________________________________________
> Cheetahtemplate-discuss mailing list
> Cheetahtemplate-discuss@...
> https://lists.sourceforge.net/lists/listinfo/cheetahtemplate-discuss
>

------------------------------------------------------------------------------
Come build with us! The BlackBerry(R) Developer Conference in SF, CA
is the only developer event you need to attend this year. Jumpstart your
developing skills, take BlackBerry mobile applications to market and stay
ahead of the curve. Join us from November 9 - 12, 2009. Register now!
http://p.sf.net/sfu/devconference
_______________________________________________
Cheetahtemplate-discuss mailing list
Cheetahtemplate-discuss@...
https://lists.sourceforge.net/lists/listinfo/cheetahtemplate-discuss