A short list of some of my answers where I put a certain effort in:

General

• composition of built-in functions
• itertools: 0, 1, 2, 3,

Decorators and dynamic programming

• dynamic getter/setter descriptors protocol with decorators
• dynamic descriptor protocol

Scraping

• trick with dynamic content

• find by multiple attributes (args/kwargs)

• find by multiple tag's names

• find with SoupStrainer

• find with regex pattern

Regex

• custom match-function

• symbolic grouping

• re nesting groups limitation: bypass with "post-processing"

Pdf manipulation

• merging pdfs

Various stuffs

• datetime 0, 1, 2
• os 1, 2
• table-formatting