Скачать или смотреть How to Create a Simple Loading Bar in Python 3

Learn how to create a simple loading bar in Python 3 that displays a dynamic message with real-time updates. Perfect for beginners wanting to enhance their coding skills!
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This video is based on the question https://stackoverflow.com/q/62353324/ asked by the user 'imn1698' ( https://stackoverflow.com/u/13736976/ ) and on the answer https://stackoverflow.com/a/62353351/ provided by the user 'Balaji Ambresh' ( https://stackoverflow.com/u/12611409/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Creating a Simple Loading Bar in Python 3

If you're new to programming and wish to add a touch of flair to your Python scripts, creating a simple loading bar is an excellent project to tackle. This guide will guide you through the process of making a loading bar that updates every second, giving real-time feedback while performing calculations.

The Problem

One common task is to display a message while a program is processing data. For example, you might want a script to say "Calculating..." and gradually append dots to it after every second. This way, users know the program is still running and hasn't frozen. However, as you've experienced, using the end='' parameter to keep the message on the same line sometimes leads to delays that group output together instead of displaying it incrementally.

Initial Approach

Here's a simplistic version of code that does not display the loading bar as intended:

[[See Video to Reveal this Text or Code Snippet]]

The Issue

While the above implementation seems straightforward, the print statements do not behave as expected. Instead of showing the loading process in real-time, they pause and output everything at once after the delay.

The Solution

The key to resolving this issue lies in using flush=True within your print statements. This ensures that the output buffer is flushed immediately, allowing the program to show updates on the screen instantly.

Updated Code

Here's how you can modify your existing code to include flush=True:

[[See Video to Reveal this Text or Code Snippet]]

Key Changes

Flush the Output Buffer: By adding flush=True to your print statements, each dot will appear on the console immediately after the one-second delay, creating a smooth loading effect.

Real-Time Updates: Now, users will immediately see updates, making your program feel more responsive and user-friendly.

Conclusion

Creating a loading bar in Python might seem daunting at first, but with a few simple adjustments like using flush=True, you can enhance your user interface significantly. Not only does this practice improve user experience, but it also helps reinforce important programming concepts like output handling.

Now, go ahead and try it out with different time intervals or messages to see how creative you can get with your loading bar!