What do these pieces of code mean?

Python write an expression that executes the loop body as long as the user enters a non-negative number. note: if the submitted code has an infinite loop, the system will stop running the code after a few seconds and report "program end never reached." the system doesn't print the test case that caused the reported message. sample outputs with inputs: 9 5 2 -1

Requirement types discussed during software development include functional and color scheme nonfunctional and code style constraint and nonfunctional fashionable and functional.

Idon understand these and need some ! ?