Context managers control runtime environments via the __enter__ and __exit__ magic methods. Beyond closing files, they manage database transaction rollbacks, network sockets, and execution timing blocks.
For 100k+ pages, switch to pisa (xhtml2pdf) with incremental flushing to disk.
A "verified" Python codebase requires comprehensive testing.
Introduced in Python 3.10, structural pattern matching is more than just a "switch statement." It allows for deep inspection of data structures.