PSW - Python Stop Watch

psw is a lightweight, intuitive Command Line Interface (CLI) stopwatch and timer utility written in Python. It features live console rendering, interactive real-time controls, and built-in repeat functionalities without requiring any complex external audio dependencies.

Install

You can install psw via pip:

pip install psw

Usage

1. Stopwatch Mode

Measure elapsed time directly in your terminal.

Start the Stopwatch

To start the stopwatch, run:

psw start

The live clock will be displayed in the console:

00 h 00 m 00.000 s

Options

• -p, --precision: Specifies the number of decimal places for seconds.
• Default: 3 (millisecond precision)
• Example: psw start -p 2 will display 00 h 00 m 00.00 s

Interactive Controls (While Running)

While the stopwatch is active, you can control it in real-time using the following keys:

• s: Pause / Resume the stopwatch.
• l: Record a lap time. The current lap time will be printed below the running clock without stopping the main timer.
• q (or Ctrl+C): Quit the stopwatch and display the final summary.

2. Timer Mode

Count down from a specified duration with advanced repeat and notification options.

Start the Timer

To start a countdown, use the timer command followed by the duration. You can specify hours (h), minutes (m), and seconds (s).

# Set a timer for 5 minutes and 30 seconds
psw timer 5m 30s

# Set a timer for 1 hour
psw timer 1h

The countdown will be displayed in the console:

00 h 05 m 30.000 s

Options

• -p, --precision: Same as the stopwatch mode, specifies the decimal places for seconds (Default: 3).
• -r, --repeat [<integer>]: Restarts the timer when it reaches zero.
  • Use without arguments for an infinite loop.
    • Example: psw timer 1m -r
  • Specify an integer to repeat a specific number of times.
    • Example: psw timer 1m -r 3 (Runs a 1-minute timer 3 times)
• -m, --mute: Disables the system alert sound (terminal bell) when the timer ends.

Interactive Controls (While Running)

• s: Pause / Resume the countdown.
• q (or Ctrl+C): Cancel and exit the timer.