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[3.11] clarify the 4300-digit limit on int-str conversion (GH-100175) #100193

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miss-islington merged 1 commit into from
Dec 12, 2022
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[3.11] clarify the 4300-digit limit on int-str conversion (GH-100175) #100193

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clarify the 4300-digit limit on int-str conversion (GH-100175) 
(cherry picked from commit 935ef59)

Co-authored-by: Ned Batchelder <ned@nedbatchelder.com>
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@nedbat @miss-islington
nedbat authored and miss-islington committed Dec 12, 2022
commit 39e461bbace645da94de14581c3afd401c8735d1
4 changes: 2 additions & 2 deletions Doc/library/stdtypes.rst
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Expand Up @@ -5493,15 +5493,15 @@ 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; use sys.set_int_max_str_digits() to increase the limit.
ValueError: Exceeds the limit (4300 digits) 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
>>> i_squared = i*i
>>> len(str(i_squared))
Traceback (most recent call last):
...
ValueError: Exceeds the limit (4300) for integer string conversion: value has 8599 digits; use sys.set_int_max_str_digits() to increase the limit.
ValueError: Exceeds the limit (4300 digits) 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.
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4 changes: 2 additions & 2 deletions Objects/longobject.c
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Expand Up @@ -36,8 +36,8 @@ medium_value(PyLongObject *x)
#define IS_SMALL_INT(ival) (-_PY_NSMALLNEGINTS <= (ival) && (ival) < _PY_NSMALLPOSINTS)
#define IS_SMALL_UINT(ival) ((ival) < _PY_NSMALLPOSINTS)

#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"
#define _MAX_STR_DIGITS_ERROR_FMT_TO_INT "Exceeds the limit (%d digits) 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 digits) for integer string conversion; use sys.set_int_max_str_digits() to increase the limit"

static inline void
_Py_DECREF_INT(PyLongObject *op)
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