Feature or enhancement

Proposal:

Currentlyint.from_bytes takes aPyObject* and alwaysconverts it to abytes usingPyObject_Bytes. When a "bytes-like" object is passed in, such asbytearray in_pylong, thePyObject_Bytes function has to make a newPyBytes* and copy the data from the bytes-like into it. Utilize the buffer protocol, with a fallback to PyObject_Bytes, to remove that object allocation and copy making the conversion faster.

I think the fallback is needed becausePyObject_Bytes supports additional methods, such as.__bytes__() to construct thebytes, which should remain supported. That means need to keep doingbytes as bytes_obj: object in Argument Clinic, rather thanbytes as bytes_obj: Py_buffer.

Has this already been discussed elsewhere?

This is a minor feature, which does not need previous discussion elsewhere

Links to previous discussion of this feature:

No response

Linked PRs

• gh-132108: Add Buffer Protocol support to int.from_bytes to improve performance #132109