Скачать или смотреть How to Fix the MozillaCookieJar Saving Issue in Python 3.8

Learn how to ensure your cookies are saved correctly in Python using `MozillaCookieJar` by overcoming the session cookie limitation.
---
This video is based on the question https://stackoverflow.com/q/71179377/ asked by the user 'Jellicle' ( https://stackoverflow.com/u/507721/ ) and on the answer https://stackoverflow.com/a/71179844/ provided by the user 'Jellicle' ( https://stackoverflow.com/u/507721/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

Visit these links for original content and any more details, such as alternate solutions, latest updates/developments on topic, comments, revision history etc. For example, the original title of the Question was: Python CookieJar saves file with no cookies

Also, Content (except music) licensed under CC BY-SA https://meta.stackexchange.com/help/l...
The original Question post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license, and the original Answer post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license.

If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com.
---
How to Fix the MozillaCookieJar Saving Issue in Python 3.8

Have you ever encountered a scenario while using Python's http.cookiejar.MozillaCookieJar where you have added cookies only to discover that none are saved to your file? If this sounds familiar, you're not alone! Many developers face this unexpected frustration, especially when they think they’ve done everything right. Let’s dive into why this happens and how to resolve the issue effectively.

Understanding the Problem

In Python 3.8, you might find yourself filling a MozillaCookieJar with cookies, as shown below:

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

After executing the above code, you may run the jar.save() method expecting to see your cookies in the saved-cookies.txt, only to find it is empty apart from the standard header comments:

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

Why is this happening? The likely cause is that you are dealing with session cookies and how they are treated when saving.

Why Are Cookies Not Being Saved?

The save() function in MozillaCookieJar ignores session cookies by default when the expires argument is set to False. Since the cookie created above is, by definition, a session cookie, it won't be saved when you call jar.save() without making adjustments.

Key Points

Session Cookies: These cookies do not have an expiration date and are typically discarded when the user closes their browser or session.

Default Behavior: Without explicitly stating otherwise, the save function will overlook these session cookies.

The Solution: Use ignore_expired=True

The good news is that you can easily resolve this by modifying the way you call the save() function. By adding the ignore_expired=True argument, you instruct Python to save even the session cookies.

Here’s How to Do It

To save your cookies properly, simply adjust your save call as follows:

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

What Now?

After implementing this change, your saved-cookies.txt should include the cookies you previously added, allowing you to use and manage them as needed. This solution ensures that all cookies, regardless of their expiration status, are saved accurately to the file.

Conclusion

Encountering issues while working with cookies in Python can be frustrating, but hopefully this guide has shed some light on the MozillaCookieJar saving behavior. By understanding the default settings around session cookies and aware of how to adjust the save() function, you can now confidently manage cookies in your Python projects.

If you continue to have challenges, don't hesitate to reach out to the Python community or refer to the official documentation for further assistance. Happy coding!