Which Python Version To Use 2021

Python Programming

As a tech enthusiast and Python developer, I am often asked about which version of Python is the best to use in 2021. Python has evolved over the years, with new versions being released regularly. Each version brings improvements, bug fixes, and new features. In this article, I will delve deep into the topic and provide my personal insights and recommendations on which Python version to use in 2021.

Python 2 vs. Python 3: The Great Divide

Before we discuss the specific Python versions available in 2021, it is important to address the Python 2 versus Python 3 debate. Python 2 was released in 2000 and quickly gained popularity. However, with the release of Python 3 in 2008, the Python community faced a dilemma. Python 3 introduced significant improvements and new features, but it was not backward-compatible with Python 2.

For many years, Python 2 remained in widespread use, with developers reluctant to make the switch to Python 3 due to the potential for breaking existing codebases. However, the Python Software Foundation made it clear that Python 2 would no longer be maintained after January 1, 2020, urging developers to migrate their projects to Python 3.

Therefore, in 2021, it is crucial to use Python 3 for any new projects. Python 3 offers better performance, enhanced syntax, improved Unicode support, and a more robust standard library. Most third-party libraries and frameworks have also shifted their focus to Python 3, making it the clear choice for modern Python development.

Python 3.9: The Latest and Greatest

In 2021, the latest stable version of Python is Python 3.9. Released in October 2020, Python 3.9 builds upon the advancements of previous versions and introduces several exciting features.

One notable addition in Python 3.9 is the new syntax for dictionary merging using the union operator ‘|’. This makes it easier and cleaner to combine dictionaries, reducing code verbosity. Another significant enhancement is the introduction of the ‘zoneinfo’ module, which provides better support for time zones and improves datetime handling.

In addition to new features, Python 3.9 also brings performance improvements and bug fixes. The Python developers have put in a tremendous amount of effort to optimize the interpreter, resulting in faster execution times for certain operations.

If you are starting a new project in 2021, I highly recommend using Python 3.9. It offers the latest features, improved performance, and is well-supported by the Python community.

Legacy Projects and Python 2 Compatibility

While Python 3 should be the default choice for new projects, there may be cases where you need to work with existing Python 2 codebases or libraries that have not yet migrated to Python 3.

If you find yourself in such a situation, consider using Python 2.7. Despite Python 2’s end of life, Python 2.7 is still actively maintained with bug fixes and security patches. Python 2.7 provides a transitionary bridge for legacy projects, allowing you to maintain compatibility while planning for the eventual migration to Python 3.


In conclusion, for any new Python projects in 2021, I strongly recommend using Python 3.9. It is the latest stable version, equipped with modern features, performance improvements, and an active community. However, it is essential to assess your specific project requirements and consider any dependencies on legacy code or libraries that may still be working with Python 2.7.

Embracing Python 3 will future-proof your codebase, ensure compatibility with the latest libraries and frameworks, and take advantage of the language’s ongoing development and support. Happy coding!