Yesterday, while writing a Python program to batch-process Markdown files, I encountered an issue with improper use of the rstrip method. I'm documenting this.

The new version of Python 3.11 was released yesterday. Officially, 3.11 is 10-60% faster than 3.10, and the standard test set is 1.25x faster. There are also other updates. The question is, how to update to the latest version under Linux.