Argument parser errors are printed without a trailing newline

[emanuele6]

Command Line

$ autopep8
incorrect number of arguments$ autopep8
incorrect number of arguments$

Your Environment

• Python version: Python 3.11.5
• autopep8 version: autopep8 2.0.4 (pycodestyle: 2.11.0)
• Platform: windows, linux, macOSX, and other OS...: archlinux

Errors are printed without a trailing newline

[emanuele6]

I bisected the problem; it was introduced with 24da506 that replaced all calls to parser.error(message) with calls to parser.exit(EXIT_CODE_ARGPARSE_ERROR, message).

Before the change, those argparse errors were displayed as:

$ ./autopep8.py
usage: autopep8 [-h] [--version] [-v] [-d] [-i] [--global-config filename]
                [--ignore-local-config] [-r] [-j n] [-p n] [-a]
                [--experimental] [--exclude globs] [--list-fixes]
                [--ignore errors] [--select errors] [--max-line-length n]
                [--line-range line line] [--hang-closing] [--exit-code]
                [files ...]
autopep8: error: incorrect number of arguments
$ 

Now, they are displayed as:

$ ./autopep8.py
incorrect number of arguments$ # no trailing newline