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gh-84008: Document that the LC_NUMERIC locale affects tkinter numeric widgets #152008

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gh-84008: Document that the LC_NUMERIC locale affects tkinter numeric widgets #152008

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18 changes: 18 additions & 0 deletions Doc/library/tkinter.rst
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Original file line number Diff line number Diff line change
Expand Up @@ -5042,6 +5042,9 @@ Widget classes
dropped; *from* is spelled ``from_`` because :keyword:`from` is a Python
keyword.

With a non-integer *resolution*, see :ref:`numeric values and the locale
<tkinter-numeric-locale>`.

.. method:: get()

Return the current value of the scale.
Expand Down Expand Up @@ -5140,6 +5143,9 @@ Widget classes
text.
Inherits from :class:`Widget` and :class:`XView`.

With a non-integer *increment*, see :ref:`numeric values and the locale
<tkinter-numeric-locale>`.

Many of the methods take an *index* argument identifying a character in the
spinbox's string.
As described in the Tk ``spinbox`` manual page, *index* may be a numeric
Expand Down Expand Up @@ -6028,6 +6034,18 @@ Variable classes

Return the value of the variable as a :class:`float`.

.. _tkinter-numeric-locale:

.. note::

A floating-point value is always parsed with a period (``.``) as the
decimal separator, but :class:`Spinbox`, :class:`Scale` and
:class:`ttk.Spinbox <tkinter.ttk.Spinbox>` format it according to the
``LC_NUMERIC`` locale. Under a locale that uses a comma they produce a
value that :meth:`get` cannot read, raising :exc:`TclError`. Set
``LC_NUMERIC`` to a locale that uses a period (such as ``'C'``) to avoid
this.


.. class:: BooleanVar(master=None, value=None, name=None)

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3 changes: 3 additions & 0 deletions Doc/library/tkinter.ttk.rst
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Expand Up @@ -463,6 +463,9 @@ ttk.Spinbox

.. class:: Spinbox

With a non-integer increment, see :ref:`numeric values and the locale
<tkinter-numeric-locale>`.

.. versionadded:: 3.8

.. method:: get()
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