gh-84008: Document that the LC_NUMERIC locale affects tkinter numeric widgets#152008
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serhiy-storchaka merged 1 commit intoJun 24, 2026
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…umeric widgets Spinbox, Scale and ttk.Spinbox format floating-point values according to the LC_NUMERIC locale, but such values are always parsed with a period, so a comma-decimal locale breaks DoubleVar.get(). Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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Thanks @serhiy-storchaka for the PR 🌮🎉.. I'm working now to backport this PR to: 3.13, 3.14, 3.15. |
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GH-152049 is a backport of this pull request to the 3.15 branch. |
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GH-152050 is a backport of this pull request to the 3.14 branch. |
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GH-152051 is a backport of this pull request to the 3.13 branch. |
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…numeric widgets (GH-152008) (GH-152051) Spinbox, Scale and ttk.Spinbox format floating-point values according to the LC_NUMERIC locale, but such values are always parsed with a period, so a comma-decimal locale breaks DoubleVar.get(). (cherry picked from commit ee78d43) Co-authored-by: Serhiy Storchaka <storchaka@gmail.com> Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>
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…numeric widgets (GH-152008) (GH-152050) Spinbox, Scale and ttk.Spinbox format floating-point values according to the LC_NUMERIC locale, but such values are always parsed with a period, so a comma-decimal locale breaks DoubleVar.get(). (cherry picked from commit ee78d43) Co-authored-by: Serhiy Storchaka <storchaka@gmail.com> Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>
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…numeric widgets (GH-152008) (GH-152049) Spinbox, Scale and ttk.Spinbox format floating-point values according to the LC_NUMERIC locale, but such values are always parsed with a period, so a comma-decimal locale breaks DoubleVar.get(). (cherry picked from commit ee78d43) Co-authored-by: Serhiy Storchaka <storchaka@gmail.com> Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>
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tkinter.Spinbox,tkinter.Scaleandtkinter.ttk.Spinboxformat floating-point values according to theLC_NUMERIClocale (via Tcl'sformat, which uses the C library), but Tk always parses numbers with a period as the decimal separator.Under a locale that uses a comma (for example
de_DE), stepping such a widget writes a value like"0,1"into the linked variable, andDoubleVar.get()then fails withTclError: expected floating-point number but got "0,1".This is an inherent Tcl/Tk inconsistency (locale-dependent formatting vs locale-independent parsing) that cannot be fixed cleanly in tkinter; I confirmed it is still present on Tk 8.6.17, 9.0.4 and 9.1b0.
ttk.Scaleis not affected, since it stores a raw double.This documents the limitation: a note on
DoubleVardescribing it and theLC_NUMERIC='C'workaround, with cross-references from the affected widgets.🤖 Generated with Claude Code