Hillel Wayne - Beyond Unit Tests: Taking Your Testing to the Next Level - PyCon 2018 

The talk was at PyCon (Python Conference), there isn't anything specific that makes this constrained to Python.

it's because how easily hackable and dynamic python is, you can even do things like modify the AST of a function at runtime, or pull the stack frame out and inspect it at runtime, which makes it possible to write some wacky contracts that's basically impossible in many other languages

Well now that C++20 will get them as language feature, few more will now.

cypix314123 That’s interesting and puzzling. How are they going to implement it? Seems to me there will be lots of extra new syntax, which would make contracts much, much less readable than just regular comments.

@@magno5157 I don't really know. I think they will use the C++ attribute syntax. I stop working with C++ at C++14 and I heard that about contracts on C++ podcast. I found this www.modernescpp.com/index.php/c-core-guidelines-a-detour-to-contracts int push(queue& q, int val) [[ expects: !q.full() ]] [[ ensures !q.empty() ]]{ ... [[assert: q.is_ok() ]] ... }

@@cypix314123 wow C++ is becoming even more pathetic soup of punctuation marks

from contracts

The module is: pypi.org/project/dpcontracts/ Git Repo: github.com/deadpixi/contracts

He did say 'one of the best', to be fair, and considering the limitations of Python when compared to Haskell, that's a significant achievement.