[Python-Dev] Re: AlternativeImplementationforPEP292:SimpleString Substitutions

[Moore, Paul]

From: Barry Warsaw
> What I was worried about was if you providing 'mapping' positionally,
> and kwds contained a 'mapping' key, you'll get a TypeError.  I'm going
> to change the positional argument to '__mapping' so collisions of that
> kind are less likely, and will document it in libstring.tex.

Can't you do something like

    def substitute(self, *args, **kwds):
        if len(args) > 1:
            raise TypeError # mild hack...
        if len(args) == 1:
            mapping = args[0]
            mapping.update(kwds)
        else:
            mapping = kwds

        # etc...

This avoids the use of a strangely-named positional argument, at the cost
of a check for too many positional arguments (because the interpreter no
longer does it)

Paul.


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