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[3.9] gh-95778: Mention sys.set_int_max_str_digits() in error message (#96874) (#96877)

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When ValueError is raised if an integer is larger than the limit,
mention sys.set_int_max_str_digits() in the error message.

(cherry picked from commit e841ffc915)

Co-authored-by: Ned Deily <nad@python.org>
This commit is contained in:
Victor Stinner 2022-10-04 19:05:45 +02:00 • committed by GitHub
parent 9b409e418a
commit 41188134bd
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3 changed files with 7 additions and 4 deletions
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4
Doc/library/stdtypes.rst
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@ -5277,7 +5277,7 @@ When an operation would exceed the limit, a :exc:`ValueError` is raised:
>>> _ = int('2' * 5432)
Traceback (most recent call last):
...
ValueError: Exceeds the limit (4300) for integer string conversion: value has 5432 digits.
ValueError: Exceeds the limit (4300) for integer string conversion: value has 5432 digits; use sys.set_int_max_str_digits() to increase the limit.
>>> i = int('2' * 4300)
>>> len(str(i))
4300
@ -5285,7 +5285,7 @@ When an operation would exceed the limit, a :exc:`ValueError` is raised:
>>> len(str(i_squared))
Traceback (most recent call last):
...
ValueError: Exceeds the limit (4300) for integer string conversion: value has 8599 digits.
ValueError: Exceeds the limit (4300) for integer string conversion: value has 8599 digits; use sys.set_int_max_str_digits() to increase the limit.
>>> len(hex(i_squared))
7144
>>> assert int(hex(i_squared), base=16) == i*i # Hexadecimal is unlimited.

3
Misc/NEWS.d/next/Core and Builtins/2022-09-16-19-02-40.gh-issue-95778.cJmnst.rst Normal file
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@ -0,0 +1,3 @@
When :exc:`ValueError` is raised if an integer is larger than the limit,
mention the :func:`sys.set_int_max_str_digits` function in the error message.
Patch by Victor Stinner.

4
Objects/longobject.c
View file

@ -38,8 +38,8 @@ PyObject *_PyLong_One = NULL;
#define IS_SMALL_INT(ival) (-NSMALLNEGINTS <= (ival) && (ival) < NSMALLPOSINTS)
#define IS_SMALL_UINT(ival) ((ival) < NSMALLPOSINTS)
#define _MAX_STR_DIGITS_ERROR_FMT_TO_INT "Exceeds the limit (%d) for integer string conversion: value has %zd digits"
#define _MAX_STR_DIGITS_ERROR_FMT_TO_STR "Exceeds the limit (%d) for integer string conversion"
#define _MAX_STR_DIGITS_ERROR_FMT_TO_INT "Exceeds the limit (%d) for integer string conversion: value has %zd digits; use sys.set_int_max_str_digits() to increase the limit"
#define _MAX_STR_DIGITS_ERROR_FMT_TO_STR "Exceeds the limit (%d) for integer string conversion; use sys.set_int_max_str_digits() to increase the limit"
static PyObject *
get_small_int(sdigit ival)