short_string = "fo r ba oo"

 long_string1 = "foo bar baz"
 long_string2 = "soo az bn"

# match between short and long_string1
 match1 = ['fo', 'ba', 'oo']
 # same for long_string2
 match2  = ['oo', 'az']

# It would be better if we ignore the spaces
 prop_match1 = sum([len(i) for i in match1])/len(short_string)
 # 0.6

 # same for prop_match2
 # outputs 0.4