Answer to an interview question.

interview.py

""" Interview question

Write a method that takes a string, and returns the string in reverse.
For instance, if passed abc123 it should return 321cba

"""

class StringUtil(object):
  """ Utility for strings

  """

  def Reverse(self, string):
    """ Returns the given string in reverse order """

    return string[::-1]

  def Reverse2(self, string):
    """A less pythonic but more portable approach to reverse string order"""

    position = len(string) - 1
    tempContainer = []

    while position >= 0:
      element = string[position]
      tempContainer.append(element)
      position -= 1

    return ''.join(tempContainer)

if __name__ == '__main__':

  import unittest

  class StringUtilTestCase(unittest.TestCase):
    "Test case for the StringUtil class"

    def setUp(self):
      """Initial setup for all tests"""

      self.su = StringUtil()
      self.testString = 'abc123'
      self.reversedString = '321cba'

    def test_Reverse(self):
      """Test string reversal using the first method"""

      testResult = self.su.Reverse(self.testString)
      self.assertEqual(testResult, self.reversedString)

    def test_Reverse2(self):
      """Test string reversal using the second method"""

      testResult = self.su.Reverse2(self.testString)
      self.assertEqual(testResult, self.reversedString)

  unittest.main()