Can somebody explain how this number to roman number code work?

Question

class py_solution:
def int_to_Roman(self, num):
val = [
1000, 900, 500, 400,
100, 90, 50, 40,
10, 9, 5, 4,
1
]
syb = [
"M", "CM", "D", "CD",
"C", "XC", "L", "XL",
"X", "IX", "V", "IV",
"I"
]
roman_num = ''
i = 0
while num > 0:
for _ in range(num // val[i]):
roman_num += syb[i]
num -= val[i]
i += 1
return roman_num

print(py_solution().int_to_Roman(1))
print(py_solution().int_to_Roman(4000))

Answer 1

Syb contain the symbol appropriate to val. The loop uses val to divide a given value to translate it