int.from_bytes is affected by integer string conversion limit

[nog642]

Documentation

The documentation here: https://docs.python.org/3/library/stdtypes.html#affected-apis

says that int.from_bytes is not affected by the integer string conversion limit.

The limitations do not apply to functions with a linear algorithm:

• int(string, base) with base 2, 4, 8, 16, or 32.
• int.from_bytes() and int.to_bytes().

However, it seems that it is. I've reproduced this on both 3.10 and 3.12:

Python 3.10.13 (main, Dec 12 2023, 22:43:26) [GCC 7.5.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> int.from_bytes(b'\x80'+b'\0'*100000, byteorder='big')
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ValueError: Exceeds the limit (4300) for integer string conversion; use sys.set_int_max_str_digits() to increase the limit

Python 3.12.2 (main, Apr 21 2024, 00:52:02) [GCC 7.5.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> int.from_bytes(b'\x80'+b'\0'*100000)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ValueError: Exceeds the limit (4300 digits) for integer string conversion; use sys.set_int_max_str_digits() to increase the limit

[Athulsuminamukundan]

https://t.me/+ObTRPfU9M2ZjNWE0

[Athulsuminamukundan]

https://t.me/+ObTRPfU9M2ZjNWE0

[skirpichev]

It is not affected:

>>> s = int.from_bytes(b'\x80'+b'\0'*100000)  # no error
>>> 

It's repr affected here.

[nog642]

Ah I see, that makes sense.