Why can't this work in python 3

Question

roman numeral challenge works in 2.7
https://code.sololearn.com/c2rGsc1VAKYE/?ref=app

Answer 1

I found the following:
1. Missing parenthesis in line 56
2. Wrong operator in line 8 - should be //
3. Wrong division operators throughout the code - should all be floor division operators which are // in Python 3
4. Wrong 900 literal - should be "cm"
5. Wrong logic of if statements - doesn't work properly for 1410 for example -- change line 21 to fix that
6. Wrong 40 literal - should be "xl"

Answer 2

This does work: outstr += (v//5 * "v")
I was missing an end bracket on the line before print.
I don't understand why your input has to end with a zero. And I don't understand why the last line asks for input again.

Answer 3

This can also work: outstr += (int(v/5) * "v")

Answer 4

thanks for the prompt answers.. thejump from from 2.7 is a big change. isnt it backwards compatible