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vstinnerned-deily
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[3.9] pythongh-95778: Mention sys.set_int_max_str_digits() in error message (python#96874) (python#96877)
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 e841ffc) Co-authored-by: Ned Deily <nad@python.org>
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Doc/library/stdtypes.rst

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@@ -5277,15 +5277,15 @@ When an operation would exceed the limit, a :exc:`ValueError` is raised:
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>>> _ = int('2' * 5432)
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Traceback (most recent call last):
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...
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ValueError: Exceeds the limit (4300) for integer string conversion: value has 5432 digits.
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ValueError: Exceeds the limit (4300) for integer string conversion: value has 5432 digits; use sys.set_int_max_str_digits() to increase the limit.
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>>> i = int('2' * 4300)
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>>> len(str(i))
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4300
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>>> i_squared = i*i
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>>> len(str(i_squared))
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Traceback (most recent call last):
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...
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ValueError: Exceeds the limit (4300) for integer string conversion: value has 8599 digits.
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ValueError: Exceeds the limit (4300) for integer string conversion: value has 8599 digits; use sys.set_int_max_str_digits() to increase the limit.
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>>> len(hex(i_squared))
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7144
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>>> assert int(hex(i_squared), base=16) == i*i # Hexadecimal is unlimited.
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@@ -0,0 +1,3 @@
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When :exc:`ValueError` is raised if an integer is larger than the limit,
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mention the :func:`sys.set_int_max_str_digits` function in the error message.
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Patch by Victor Stinner.

Objects/longobject.c

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

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