`input` assumes the last character is a '\n' and always strips it

Bug report

Bug description:

When reading from the tty python's builtin input function assumes that the last character read is a newline and proceed to strip it out leading to missing input.

Current behaviour:

$ ./python -c 'print(repr(input()))'
abc'ab'

Expected behaviour:

$ ./python -c 'print(repr(input()))'
abc'abc'

CPython versions tested on:

3.14, 3.13, CPython main branch

Operating systems tested on:

Linux

Linked PRs

• gh-149237

使用提供的 ./python -c 输入命令复现该问题，然后检查 CPython 的 builtin input 实现以及关联的 PR gh-149237。当读取的数据不以换行符结尾时 tty 输入不再丢失最后一个字符，并且相关测试通过，即视为完成。