PEP 501: update for tagged strings (#3944)

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* switch to lazy conversion specifier processing (includes adding `operator.convert_field`)
* added proposal for `!()` as a new conversion specifier that invokes `__call__` (rather than `__repr__` or `__str__`)
* add `render_text` callback to `TemplateLiteral.render` signature (default value: `str`)
* new protocol: `typing.InterpolationTemplate` (protocol corresponding to the concrete `types.TemplateLiteral` type)
* new protocol: `typing.TemplateText` (equivalent to `Decoded` from PEP 750)
* new protocol: `typing.TemplateField` (inspired by `Interpolation` from PEP 750, with adjustments for eager field evaluation)
* new concrete type: `types.TemplateLiteralText` (equivalent to `DecodedConcrete` from PEP 750)
* new concrete type: `types.TemplateLiteralField` (inspired by `InterpolationConcrete` from PEP 750, with adjustments for eager field evaluation)
* added iteration support to `TemplateLiteral`, producing `TemplateLiteralText` and `TemplateLiteralField` instances in their order of appearance (keeping the "no empty TemplateLiteralText entries" rule from PEP 750)
* change the way `TemplateLiteral` works based on the way PEP 750 works
* added or updated discussion notes about several included and deferred features

Closes #3904

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Alyssa Coghlan 2024-09-04 23:15:40 +10:00 committed by GitHub

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