Why am I getting pygame.error: video system not initialized despite initializing pygame?

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Common Causes and Solutions

Improper Initialization Sequence
One of the most common reasons for this error is not initializing Pygame's video subsystem correctly. Ensure that your code includes the following initialization steps early on:

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Correct Module Initialization

Pygame's initialization process is split into several modules. If you only need to initialize specific modules, make sure the video module is included:

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Unclosed Previous Video System

Another potential issue could arise if a previous instance of the video system wasn't properly shut down. Ensure that you close the video system at the end of your game's execution to avoid this issue:

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Order of Code Execution

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Runtime Environment Issues

Finally, the environment where your code runs can affect the initialization. Running Pygame in certain IDEs or within incorrect virtual environments may cause this error. Test your program in a different environment, such as a standalone Python script executed from the command line, to rule out such issues.

Conclusion

Keep these factors in check, and you should be able to navigate through this common Pygame issue effectively.