proposal to allow to set the delimiter in str.format to something other than curly bracket

Mon Apr 4 17:32:18 EDT 2011

Peter Otten wrote:
> You could automatically convert from a custom format like that in your
> original post...

<snip>
Here's a class wrapping your functionality:
import re
class Template(object):
 '''uses double brackets e.g [[ob.attr]] as delims to get
 around curly bracket ({}) collisions when generating code
 '''
 _pattern = re.compile(r"\[\[|]]|\{|\}")
 _lookup = {
 "[[": "{",
 "]]": "}",
 "{": "{{",
 "}": "}}",
 }
 def __init__(self, txt):
 self.txt = txt
 self.type = type
 def _substitute(self, m):
 return self._lookup[m.group()]
 def render(self, *args, **kwds):
 return self._pattern.sub(
 self._substitute, self.txt).format(*args, **kwds)
def test_Template():
 class P: pass
 p = P()
 p.name = 'peter'
 txt = 'hello there [[o.name]]'
 t = Template(txt)
 assert t.render(o=p) == 'hello there peter'