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PEP 750: collect spec fixes discovered during final implementation work #4364

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0e29282
Spec fix: make the debug spec section fully match f-string behavior
davepeck Apr 11, 2025
954899c
Fix lint issue
davepeck Apr 11, 2025
3ee5299
!s, not :s
davepeck Apr 11, 2025
51ca27e
conversion
davepeck Apr 11, 2025
d172707
Merge branch 'main' into pep750-debug-specifier-fix
davepeck May 1, 2025
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11 changes: 8 additions & 3 deletions peps/pep-0750.rst
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Original file line number Diff line number Diff line change
Expand Up @@ -455,7 +455,9 @@ The debug specifier, ``=``, is supported in template strings and behaves similar
to how it behaves in f-strings, though due to limitations of the implementation
there is a slight difference.

In particular, ``t'{value=}'`` is treated as ``t'value={value!r}'``:
In particular, ``t'{value=}'`` is treated as ``t'value={value!r}'``. The first
static string is rewritten from ``""`` to ``"value="`` and the ``conversion``
defaults to ``r``:

.. code-block:: python

Expand All @@ -465,8 +467,11 @@ In particular, ``t'{value=}'`` is treated as ``t'value={value!r}'``:
assert template.interpolations[0].value == "World"
assert template.interpolations[0].conversion == "r"

If a separate format string is also provided, ``t'{value=:fmt}`` is treated
instead as ``t'value={value!s:fmt}'``.
If a conversion is explicitly provided, it is kept: ``t'{value=!s}'``
is treated as ``t'value={value!s}'``.

If a format string is provided without a conversion, the ``conversion``
is set to ``None``: ``t'{value=:fmt}'`` is treated as ``t'value={value:fmt}'``.

Whitespace is preserved in the debug specifier, so ``t'{value = }'`` is
treated as ``t'value = {value!r}'``.
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