[issue1686] string.Template.safe_substitute fail when overriding pattern attribute

[Raymond Hettinger]

Raymond Hettinger <rhettinger at users.sourceforge.net> added the comment:

Barry, I'm -0 on this one.  ISTM the cure is worst than the disease and
makes the code less modifiable, understandable, or maintainable.

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nosy: +rhettinger

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