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PEP 701: Specify a lower bound for the nesting level (#3048)

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Pablo Galindo Salgado 2023-03-10 16:38:58 +00:00 committed by GitHub
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@ -9,6 +9,7 @@ Type: Standards Track
Content-Type: text/x-rst
Created: 15-Nov-2022
Python-Version: 3.12
Post-History: `19-Dec-2022 <https://discuss.python.org/t/pep-701-syntactic-formalization-of-f-strings/22046>`__,
Abstract
@ -225,9 +226,12 @@ for details on the syntax):
The new tokens (``FSTRING_START``, ``FSTRING_MIDDLE``, ``FSTRING_END``) are defined
:ref:`later in this document <701-new-tokens>`.
This PEP leaves up to the implementation the level of f-string nesting allowed.
This means that limiting nesting is **not part of the language specification**
but also the language specification **doesn't mandate arbitrary nesting**.
This PEP leaves up to the implementation the level of f-string nesting allowed but
**specifies a lower bound of 5 levels of nesting**. This is to ensure that users can
have a reasonable expectation of being able to nest f-strings with "reasonable" depth.
This PEP implies that limiting nesting is **not part of the language
specification** but also the language specification **doesn't mandate arbitrary
nesting**.
The new grammar will preserve the Abstract Syntax Tree (AST) of the current
implementation. This means that no semantic changes will be introduced by this