Integer to roman numeral
Converts an integer to its roman numeral representation.
Accepts value between 1
and 3999
(both inclusive).
- Create a lookup list containing tuples in the form of (roman value, integer).
- Use a
for
loop to iterate over the values inlookup
. - Use
divmod()
to updatenum
with the remainder, adding the roman numeral representation to the result.
def to_roman_numeral(num): lookup = [ (1000, 'M'), (900, 'CM'), (500, 'D'), (400, 'CD'), (100, 'C'), (90, 'XC'), (50, 'L'), (40, 'XL'), (10, 'X'), (9, 'IX'), (5, 'V'), (4, 'IV'), (1, 'I'), ] res = '' for (n, roman) in lookup: (d, num) = divmod(num, n) res += roman * d return res to_roman_numeral(3) # 'III' to_roman_numeral(11) # 'XI' to_roman_numeral(1998) # 'MCMXCVIII'