[kras143]

My personal experience with a large project which I started in Python and later moved to Haskell: I did indeed get things done quickly in Python and had majority of the problem solved. Then I had few nasty bugs which made me change/refactor the code and thats where my problem started. I quickly realized refactoring a huge codebase in Python was really difficult. Maybe there is a better way to organize my python code, I do not know. Then I moved to Haskell (partly because of the excellent Parsec library which made things very simpler compared to the yacc style PLY I was using in Python). Initially, the fix-compile-execute cycle was really painful, but I soon realized how I could figure out some functional bugs (not type bugs) just by reasoning about the types. The compiler too helped in some cases with valid type conversion errors. I would have caught such issues in python only if I had a very large test suite which covers this corner case. Nevertheless, I am happy with the move and my love for static typing is only going up everyday.