How can I get this code to return the cheapest item in the store?

Question

import random

def main():
    
    Sobeys = {\'broccoli\': 1.27, \'muffins\': 5.0, \'donuts\': 1.85,
          \'yogurt\': 2.41, \'bagels\': 4.91, \'bread\': 4.48,