Скачать или смотреть How to Fix the it's not the same object as Error When Serializing Python Objects

Learn how to resolve the common serialization error in Python when working with classes and objects. Perfect for game developers looking to implement save features in their text-based games.
---
This video is based on the question https://stackoverflow.com/q/65903390/ asked by the user 'Socksonme' ( https://stackoverflow.com/u/14929192/ ) and on the answer https://stackoverflow.com/a/65903477/ provided by the user 'Wondercricket' ( https://stackoverflow.com/u/1040092/ ) 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: "it's not the same object as" error when trying to serialize an object

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.
---
Solving the it's not the same object as Error in Python Serialization

When developing software, especially in the realm of games, implementing a save feature is crucial for enhancing user experience. However, many developers encounter an unsettling roadblock during the serialization process in Python: the infamous it's not the same object as error with pickle. If you've found yourself puzzled by this error while attempting to serialize your Player object, worry not! In this post, we will break down the issue and guide you step-by-step through the solution.

Understanding the Problem

In Python, the pickle module is used for serializing (saving) and deserializing (loading) Python objects. This allows developers to persist the state of an object, which is particularly useful in scenarios like saving a game's progress. However, if you mistakenly overwrite your class name with a variable, like in the snippet provided below, you'll run into a serialization error:

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

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

The line Player = Player(20, 5, 0, [], 0) is where the problem starts. Here, you've named the variable Player, which shadows (overwrites) the actual Player class. When you then try to use pickle.dump() to save your object, it leads to a PicklingError because Python sees two different Player entities: the class and the instance.

Error Message:

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

The Solution: Rename Your Variable

The fix for this issue is straightforward—simply rename your variable to something that does not conflict with the class name. Below is the corrected version of the code that resolves the error:

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

Here are the steps to follow:

Identify Class Name: Keep your class name clear and unique, like Player.

Rename Instance Variable: When creating an instance of your class, use a different name. In our case, p is used to represent the player object:

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

Saving the Object: Now, you can serialize without errors:

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

Conclusion

In summary, the it's not the same object as error in Python occurs when the class name is overwritten by an instance of that class. By adopting a clear naming convention and ensuring that instance variables are distinct from class names, you can avoid this problem and successfully implement serialization in your game or application.

This simple adjustment will not only help you fix the error but will also pave the way for successful state-saving features in your text-based game. Happy coding!