I love Python, up until I remember that I can't make any guarantees of program correctness until I have 100% coverage tests on every line of code because the la

I love Python, up until I remember that I can't make any guarantees of program correctness until I have 100% coverage tests on every line of code because the language is so flexible that it can't tell if a random identifier refers to a variable name that might exist at runtime (but is not determinable to exist at compile time), and therefore most of my variable-name typos that would be compile-time errors in another language are runtime errors in Python. So great for prototyping, not so great for large projects and maintenance (as I've just put the floor of my unit test cost around a factor-of-2 more code).