Roman Number to Integer.py

""" Given an string in roman no format (s)  your task is to convert it to integer .

Input:
The first line of each test case contains the no of test cases T. 
Then T test cases follow. Each test case contains a string s denoting the roman no.

Output:
For each test case in a new line print the integer representation of roman number s. 

Constraints:
1<=T<=100
1<=roman no range<4000

Example:
Input
2
V
III 
Output
5
3 """

# T = int(input())

# Python program to convert Roman Numerals 
# to Numbers 

# This function returns value of each Roman symbol 
def value(r): 
	if (r == 'I'): 
		return 1
	if (r == 'V'): 
		return 5
	if (r == 'X'): 
		return 10
	if (r == 'L'): 
		return 50
	if (r == 'C'): 
		return 100
	if (r == 'D'): 
		return 500
	if (r == 'M'): 
		return 1000
	return -1

def romanToDecimal(str): 
	res = 0
	i = 0

	while (i < len(str)): 

		# Getting value of symbol s[i] 
		s1 = value(str[i]) 

		if (i + 1 < len(str)): 

			# Getting value of symbol s[i + 1] 
			s2 = value(str[i + 1]) 

			# Comparing both values 
			if (s1 >= s2): 

				# Value of current symbol is greater 
				# or equal to the next symbol 
				res = res + s1 
				i = i + 1
			else: 

				# Value of current symbol is greater 
				# or equal to the next symbol 
				res = res + s2 - s1 
				i = i + 2
		else: 
			res = res + s1 
			i = i + 1

	return res 

# Driver code 
print("Integer form of Roman Numeral is"), 
S = input()
print(romanToDecimal(S))