Check the difference between two strings

string_diff.py

# With thanks to https://stackoverflow.com/questions/17904097/python-difference-between-two-strings
# Describes difflib-detected differences in easy-to-understand English

import difflib

cases = [('apple', 'apples'), ('banaana', 'bananas')]

for a, b in cases:     
    print('{} => {}'.format(a, b))  
    for i, s in enumerate(difflib.ndiff(a, b)):
        if s[0] == ' ': continue
        elif s[0] == '-':
            print(u'Delete "{}" from position {}'.format(s[-1],i))
        elif s[0] == '+':
            print(u'Add "{}" to position {}'.format(s[-1],i))    
    print()