A Python interpreter is a computer program that converts each high-level program statement into machine code. It translates the command that you write out into code that the computer can understand. The Python interpreter is responsible for executing Python code, and it is usually installed as /usr/local/bin/python3.12 on machines where it is available. The interpreter reads the Python source with a specialized function called a parser, which is an input processor that understands the exact syntax of the Python language. The interpreters line-editing features include interactive editing, history substitution, and code completion on systems that support the GNU Readline library.

In summary, a Python interpreter is a program that reads and executes Python code. It translates high-level program statements into machine code and is responsible for executing Python code. It also provides line-editing features such as interactive editing, history substitution, and code completion.