What version of Python is your main when executing projects?

Currently, the main version of Python used for projects is usually Python 3.9 or higher. This is because Python 2 is no longer supported, and Python 3.9+ versions include performance improvements, new syntactic features, and updated standard libraries.

For example, Python 3.9 introduced features such as type hinting with built-in generics (list[int] instead of typing.List[int]) and improvements in the functools module.

However, the specific version may depend on the project requirements and the libraries used.