New submission from Hagai Gold:
When overriding the pattern attribute on string.Template, with your own
delimiters, exmp: change the ${..} to $@@..@@, safe_substitute method
fail to restore the new delimiters, in case of keyerror.
Problem is that the method return a specific value ==>
""" return self.delimiter + '{' + braced + '}' """
I change it to be generic, with the help of the MatchObject.group() that
return the whole match.
Demonstration of the problem:
>>> from string import Template
>>> class MyTemplate(Template):
... pattern = r"""
... \$(?:
... (?P<escaped>\&) | # Escape sequence of two
delimiters
... (?P<named>[_a-z][_a-z0-9]*) | # delimiter and a Python
identifier
... @@(?P<braced>[_a-z][_a-z0-9]*)@@ | # delimiter and a braced
identifier
... (?P<invalid>) # Other ill-formed
delimiter exprs
... )
... """
...
>>> b4_str = '$@@keyError@@ change the orignal string'
>>> t = MyTemplate(b4_str)
>>> res = t.safe_substitute()
>>> print res
${keyError} change the orignal string
>>> print res == b4_str
False
>>>
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Tracker <[EMAIL PROTECTED]>
<http://bugs.python.org/issue1686>
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