What is the difference between eval repr and str functions in Python

Answer 1

http://brennerm.github.io/posts/JUMP_LINK__&&__python__&&__JUMP_LINK-str-vs-repr.html
Python's str() vs. repr() – Max Brenner

Answer 2

Thank you for this I read this though I am confused when I search more I see these lines common

repr is unambiguous and it is used by developers while str is user friendly

can u explain meaning of these sentences,please
and also explain what is __eval__

thank you