[issue13173] Default values for string.Template

[Barry A. Warsaw]

Barry A. Warsaw <barry at python.org> added the comment:

When I need defaults, I make them part of the mapping that gets passed into .substitute() and .safe_substitute().  It doesn't feel to me like it's necessary to attach them to the Template instance.  Also, couldn't you just subclass string.Template if you wanted defaults?  OTOH, since it can be done in a backward compatible way, I guess I'm -0 on the change.

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