I am developing a command-line tool in Python and I need the execution to pause at certain intervals until the user presses a key. I’ve tried using the input() function, but that requires the user to press 'Enter' specifically. Is there a way to detect a single key press, like the 'Esc' or 'Space' key, to resume the program or exit it immediately without requiring a full line of text input?
3 answers
The approach depends heavily on your operating system. For Windows, you can use the built-in msvcrt module, specifically msvcrt.getch(), which reads a single key press without echoing it to the screen. On Linux or macOS, you typically need to interface with the termios and tty modules to put the terminal in raw mode. However, for a cross-platform solution, the keyboard library is excellent; you can simply use keyboard.wait('space'). If you want to avoid third-party libraries, wrapping the logic in a platform-check if statement is the professional way to ensure your script remains portable across different environments.
Are you looking for a blocking call that pauses the entire thread, or do you need a non-blocking listener that detects a key press while other background tasks continue to run in the script?
For most simple scripts, just using input("Press Enter to continue...") is the easiest way. It’s built into Python and works everywhere without needing to install extra packages.
I agree with Nancy. Unless you specifically need a "press any key" functionality for a game or a very complex UI, sticking to the standard input() function keeps your code clean and avoids the permissions issues that often come with low-level keyboard listeners.
That is a great distinction, Steven. I actually need the script to continue processing data in the background but stop if I hit 'q'. If I use the pynput library, can I run a listener in a separate thread that sets a global flag to stop the main loop, or would that cause thread-safety issues with how Python handles keyboard interrupts in the main execution branch?