Corrections to format precision description. (GH-31291)

miss-islington · belm0 · web-flow · commit 6a7dd3f9e977 · 2022-02-13T16:21:32.000-08:00
* `precision` field is a decimal integer * clarify that stated limitations are on presentation type rather than input value type. Especially misleading is "precision is not allowed for integer values", since integer value input to a format like `.1f` is fine. * regarding max field size, replace "non-number" with "string", which is the only non-numeric presentation type Automerge-Triggered-By: GH:ericvsmith (cherry picked from commit 1d6ce67) Co-authored-by: John Belmonte <john@neggie.net>
diff --git a/Doc/library/string.rst b/Doc/library/string.rst
@@ -428,12 +428,13 @@ character of ``'0'`` with an *alignment* type of ``'='``.
    Preceding the *width* field by ``'0'`` no longer affects the default
    alignment for strings.
 
-The *precision* is a decimal number indicating how many digits should be
-displayed after the decimal point for a floating point value formatted with
-``'f'`` and ``'F'``, or before and after the decimal point for a floating point
-value formatted with ``'g'`` or ``'G'``.  For non-number types the field
+The *precision* is a decimal integer indicating how many digits should be
+displayed after the decimal point for presentation types
+``'f'`` and ``'F'``, or before and after the decimal point for presentation
+types ``'g'`` or ``'G'``.  For string presentation types the field
 indicates the maximum field size - in other words, how many characters will be
-used from the field content. The *precision* is not allowed for integer values.
+used from the field content.  The *precision* is not allowed for integer
+presentation types.
 
 Finally, the *type* determines how the data should be presented.
 
