Track 9 · Lesson 7 of 11

Validating input

Write input loops that never crash on a typo, convert safely, handle the end of input, and report every problem clearly to the user.

You will be able to

• Write a loop that keeps asking until the user enters a valid value
• Separate 'not a number' from 'a number outside the allowed range' and report each clearly
• Handle EOFError when input runs out
• Validate a whole form and report all its errors at once instead of stopping at the first