new_contents: #!/usr/bin/env python
  #
  # Topics:     Lambdas, Maps, Filters, Reduce
  #
  # Background: Lambda examples and functionality, including maps, filters, and reduces.
  #
  # Sources:
  #   - https://www.python-course.eu/lambda.php
  
  import unittest
  from functools import reduce
  
  # test functionality
  class TestMethods(unittest.TestCase):
      def test_lambda(self):
          '''Anonymous function creation'''
  
          l_function = lambda x: "name: {}".format(x)
  
          self.assertEqual(l_function('Joe'), 'name: Joe')
  
      def test_map(self):
          '''Injects all values in list into function provided'''
  
          names = ['Joe', 'Sally']
          adjusted_names = map(lambda x: "name: {}".format(x), names)
  
          self.assertEqual(list(adjusted_names), ['name: Joe', 'name: Sally'])
  
      def test_filter(self):
          '''Captures values in provided list based on function provided'''
  
          vals = ['a', 'b', 'a', 'c']
          filtered_vals = filter(lambda x: x == 'a', vals)
  
          self.assertEqual(list(filtered_vals), ['a', 'a'])
  
      def test_reduce(self):
          '''Continuously runs function over all values provided.'''
  
          vals = [1, 2, 3]
          sum_of_vals = reduce(lambda x, y: x + y, vals)
  
          self.assertEqual(sum_of_vals, 6)
  
  # main execution
  if __name__ == '__main__':
      unittest.main()
  
subject: Add Python Lambda, Map, Filter, Reduce Test