1.x VS 2.x

[kazuser]

So... what is the difference? :)

[pemistahl]

No offense, but... sometimes I really wonder why people are not willing to read the documentation thoroughly.

Starting from version 2.0.0, the pure Python implementation was replaced with compiled Python bindings to the native Rust implementation of Lingua. This decision has led to both quick performance and a small memory footprint of less than 1 GB. The pure Python implementation is still available in a separate branch in this repository and will be kept up-to-date in subsequent 1.* releases. Both 1.* and 2.* versions will remain available on the Python package index (PyPI).

So use 1.x whenever you need a pure Python implementation, e.g. when you are in an environment that does not support native extensions. Debugging is also a lot easier in pure Python code.