From 1aaed06530ee0ce3c02b2de16daf29d6299ee7bf Mon Sep 17 00:00:00 2001
From: Victor Stinner <vstinner@python.org>
Date: Fri, 16 Sep 2022 20:04:37 +0200
Subject: [PATCH] gh-95778: Mention sys.set_int_max_str_digits() in error
message (GH-96874)
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 e841ffc915e82e5ea6e3b473205417d63494808d)
Co-authored-by: Victor Stinner <vstinner@python.org>
---
Doc/library/stdtypes.rst | 4 ++--
.../2022-09-16-19-02-40.gh-issue-95778.cJmnst.rst | 3 +++
Objects/longobject.c | 4 ++--
3 files changed, 7 insertions(+), 4 deletions(-)
create mode 100644 Misc/NEWS.d/next/Core and Builtins/2022-09-16-19-02-40.gh-issue-95778.cJmnst.rst
diff --git a/Doc/library/stdtypes.rst b/Doc/library/stdtypes.rst
index c82a6ad2d04e90..a91b44fadd0488 100644
--- a/Doc/library/stdtypes.rst
+++ b/Doc/library/stdtypes.rst
@@ -5440,7 +5440,7 @@ 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
@@ -5448,7 +5448,7 @@ 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.
diff --git a/Misc/NEWS.d/next/Core and Builtins/2022-09-16-19-02-40.gh-issue-95778.cJmnst.rst b/Misc/NEWS.d/next/Core and Builtins/2022-09-16-19-02-40.gh-issue-95778.cJmnst.rst
new file mode 100644
index 00000000000000..ebf63778a605d7
--- /dev/null
+++ b/Misc/NEWS.d/next/Core and Builtins/2022-09-16-19-02-40.gh-issue-95778.cJmnst.rst
@@ -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.
diff --git a/Objects/longobject.c b/Objects/longobject.c
index aea5edc99064ec..fe4395ac5ed811 100644
--- a/Objects/longobject.c
+++ b/Objects/longobject.c
@@ -36,8 +36,8 @@ _Py_IDENTIFIER(big);
#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)