Скачать или смотреть Resolving the Elastic Beanstalk Python Version Issue: Deploying with 3.7 Instead of 2.7

Discover how to fix the deployment of Python environments in `Elastic Beanstalk`, ensuring that your application runs on the correct Python version.
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This video is based on the question https://stackoverflow.com/q/62468649/ asked by the user 'Filipe Aleixo' ( https://stackoverflow.com/u/1868775/ ) and on the answer https://stackoverflow.com/a/62468695/ provided by the user 'Marcin' ( https://stackoverflow.com/u/248823/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Fixing the Python Version Issue in Elastic Beanstalk

Deploying applications using AWS Elastic Beanstalk can sometimes lead to unexpected issues, particularly when it comes to version management of programming languages. A common problem developers face is the deployment of an environment with the wrong Python version. In this guide, we'll tackle a specific scenario where Elastic Beanstalk is deploying an environment with Python 2.7 instead of the desired 3.7.

The Problem at Hand

After initializing the Elastic Beanstalk environment with the command eb init, a developer noticed that despite selecting Python 3.7, the EC2 instance defaults to Python 2.7 when SSHed into. This discrepancy raises concerns about compatibility with the codebase, especially for applications that depend on features introduced in newer Python versions.

Here’s a quick overview of the generated configuration file:

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

This config file indicates that the application should indeed be using Python 3.7. However, when the developer checks the Python version directly on the instance, the output confirms that Python 2.7 is still the default.

Understanding the Output

When the command python is executed on the instance, it returns:

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

This output shows that the default Python installation is version 2.7.

On the other hand, when checking for Python 3.x, the result should ideally be:

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

The source of confusion is mainly rooted in the distinction between the commands python and python3.

The Solution

Switching to Python 3

To resolve this issue, developers need to explicitly use python3 for running applications or commands that require Python 3.7. Here’s how you can check if Python 3.x is installed and set up correctly:

SSH into Your EC2 Instance:
Access your elastic beanstalk instance using SSH.

Check Python 3 Installation:
Execute the command:

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

This should return the installed version of Python 3.7, confirming its presence.

Adjust Your Commands

Whenever you run a script or execute commands that require Python, ensure you replace python with python3. This simple substitution can help avoid several compatibility issues that arise from using an outdated version of Python (i.e., 2.7).

Conclusion

In summary, Elastic Beanstalk correctly initializes environments with your selected Python version. The key takeaway is to ensure that you use the correct command (python3) when interfacing with your Python applications. This practice will help maintain consistency across your development and production environments. By doing so, you'll avoid the pitfalls of version conflicts and ensure a smoother deployment process.

Final Thoughts

Always remember to verify your environment settings post-deployment to catch any discrepancies before moving forward. Happy coding!