This notebook was prepared by Donne Martin. Source and license info is on GitHub.
Refer to the Solution Notebook. If you are stuck and need a hint, the solution notebook's algorithm discussion might be a good place to start.
class Solution(object):
def find_diff(self, str1, str2):
# TODO: Implement me
pass
The following unit test is expected to fail until you solve the challenge.
# %load test_str_diff.py
import unittest
class TestFindDiff(unittest.TestCase):
def test_find_diff(self):
solution = Solution()
self.assertRaises(TypeError, solution.find_diff, None)
self.assertEqual(solution.find_diff('ab', 'aab'), 'a')
self.assertEqual(solution.find_diff('aab', 'ab'), 'a')
self.assertEqual(solution.find_diff('abcd', 'abcde'), 'e')
self.assertEqual(solution.find_diff('aaabbcdd', 'abdbacade'), 'e')
self.assertEqual(solution.find_diff_xor('ab', 'aab'), 'a')
self.assertEqual(solution.find_diff_xor('aab', 'ab'), 'a')
self.assertEqual(solution.find_diff_xor('abcd', 'abcde'), 'e')
self.assertEqual(solution.find_diff_xor('aaabbcdd', 'abdbacade'), 'e')
print('Success: test_find_diff')
def main():
test = TestFindDiff()
test.test_find_diff()
if __name__ == '__main__':
main()
Review the Solution Notebook for a discussion on algorithms and code solutions.