Live clock using Python 3 and Jupyter Notebook.
Explanation of the code by every line
1. import time: This line imports the time module, which provides various time-related functions.
2. from IPython.display import display, clear_output: This line imports the display and clear_output functions from the IPython.display module. display is used to display the output, and clear_output is used to clear the output.
3. try: This line starts a try block. The code inside this block is executed normally, and if any error occurs, it is caught and passed to the except block.
4. while True:: This line starts an infinite loop. The code inside this loop will continue to execute until an external event breaks the loop (like a KeyboardInterrupt exception).
5. time.sleep(1): This line pauses the execution of the program for 1 second.
6. clear_output(wait=True): This line clears the output of the cell. The wait=True argument means that the output will be cleared when a new output is available to replace it.
7. current_time = time.strftime("%H:%M:%S", time.localtime()): This line gets the current local time, formats it as a string in the format “HH:MM:SS”, and assigns it to the variable current_time.
8. display(current_time): This line displays the value of current_time.
9. except KeyboardInterrupt: This line starts an except block that catches KeyboardInterrupt exceptions. A KeyboardInterrupt is raised when the user hits the interrupt key (normally Control-C or Delete).
10. print("Live clock stopped"): This line prints the message “Live clock stopped”. This will execute when a KeyboardInterrupt is caught by the except block.
So, in summary, this code displays a live clock in an IPython environment, such as Jupyter Notebook. The clock updates every second, and it can be stopped by interrupting the kernel. The time displayed is the local time of the system running the code. Please note that this code will not work in a standard Python script, as it relies on IPython’s display and clear_output functions. It is designed to work in a Jupyter Notebook or similar environment. If you want to run it in a standard Python script, you would need to replace the display and clear_output functions with an alternative method of displaying and updating the time. For example, you could use print to display the time and os.system('cls') (on Windows) or os.system('clear') (on Unix/Linux) to clear the console. However, the method of clearing the console is platform-dependent and may not work in all environments. It’s also worth noting that running an infinite loop like this can consume a lot of resources, so it’s generally a good idea to make sure you have a way to break the loop, as this code does with the try/except block. If you’re running this in a Jupyter notebook, you can stop the loop by clicking the “stop” button in the toolbar. If you’re running it in a Python script, you can stop it by pressing Control-C in the console. If you’re running it in some other environment, you’ll need to figure out how to send a KeyboardInterrupt in that environment. If you can’t figure out how to do that, you might want to add some other condition to break the loop. For example, you could make the loop run for a fixed number of iterations, or you could check the time in each iteration and break the loop after a certain amount of time has passed.
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