[LINUX] [$] Custom string formatters in Python

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Python has had formatted string literals (f-strings), a syntactic shorthand for building strings, since 2015. Recently, Jim Baker, Guido van Rossum, and Paul Everitt have proposed PEP 750 ("Tag Strings For Writing Domain-Specific Languages") which would generalize and expand that mechanism to provide Python library writers with additional flexibility. Reactions to the proposed change were somewhat positive, although there was a good deal of discussion of (and opposition to) the PEP's inclusion of lazy evaluation of template parameters.

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