8000 gh-85583: Add overview of formatted string literals (f-strings) to ``str`` by AA-Turner · Pull Request #132689 · python/cpython · GitHub
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gh-85583: Add overview of formatted string literals (f-strings) to str #132689

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Merged
AA-Turner merged 7 commits into from
Apr 21, 2025
Merged

gh-85583: Add overview of formatted string literals (f-strings) to str #132689

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8d4bf9c
Add overview of formatted string literals (f-strings) to ``str`
AA-Turner Apr 18, 2025
6558eb2
Add more version changed notes
AA-Turner Apr 18, 2025
ca8b607
fixup! Add more version changed notes
AA-Turner Apr 18, 2025
e06ff6b
Resolve review
AA-Turner Apr 20, 2025
62af722
Use doctest directives
AA-Turner Apr 20, 2025
9943581
Grammar
AA-Turner Apr 21, 2025
f2c6bb4
Merge branch 'main' into docs/f-strings
AA-Turner Apr 21, 2025
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Use doctest directives
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@AA-Turner
AA-Turner committed Apr 20, 2025
commit 62af72295f4468b99d52fb06952a7bc2f260ce0d
18 changes: 9 additions & 9 deletions Doc/library/stdtypes.rst
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Expand Up @@ -2491,7 +2491,7 @@ These expressions are evaluated at runtime, similarly to :meth:`str.format`,
and are converted into regular :class:`str` objects.
For example:

.. code-block:: pycon
.. doctest::

>>> who = 'nobody'
>>> nationality = 'Spanish'
Expand All @@ -2500,7 +2500,7 @@ For example:

It is also possible to use a multi line f-string:

.. code-block:: pycon
.. doctest::

>>> f'''This is a string
... on two lines'''
Expand All @@ -2509,31 +2509,31 @@ It is also possible to use a multi line f-string:
A single opening curly bracket, ``'{'``, marks a *replacement field* that
can contain any Python expression:

.. code-block:: pycon
.. doctest::

>>> nationality = 'Spanish'
>>> f'The {nationality} Inquisition!'
'The Spanish Inquisition!'

To include a literal ``{`` or ``}``, use a double bracket:

.. code-block:: pycon
.. doctest::

>>> x = 42
>>> f'{{x}} is {x}'
'{x} is 42'

Functions can also be used, and :ref:`format specifier <formatstrings>`:

.. code-block:: pycon
.. doctest::

>>> from math import sqrt
>>> f'√2 \N{ALMOST EQUAL TO} {sqrt(2):.5f}'
'√2 ≈ 1.41421'

Any non-string expression is converted using :func:`str`, by default:

.. code-block:: pycon
.. doctest::

>>> from fractions import Fraction
>>> f'{Fraction(1, 3)}'
Expand All @@ -2552,7 +2552,7 @@ Conversion Meaning

For example:

.. code-block:: pycon
.. doctest::

>>> from fractions import Fraction
>>> f'{Fraction(1, 3)!s}'
Expand All @@ -2569,7 +2569,7 @@ This preserves spaces within the brackets, and can be used with a converter.
By default, the debugging operator uses the :func:`repr` (``!r``) conversion.
For example:

.. code-block:: pycon
.. doctest::

>>> from fractions import Fraction
>>> calculation = Fraction(1, 3)
Expand All @@ -2588,7 +2588,7 @@ or the empty string if no format specifier is given.
The formatted result is then used as the final value for the replacement field.
For example:

.. code-block:: pycon
.. doctest::

>>> from fractions import Fraction
>>> f'{Fraction(1, 7):.6f}'
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