Implement exercise 'two-fer'

config.json

@@ -801,6 +801,18 @@
         "Algorithms"
       ]
     },
+    {
+      "uuid": "bacb2184-025f-0980-38d6-34fb419e03a6d3d8b44",
+      "slug": "two-fer",
+      "core": false,
+      "unlocked_by": null,
+      "difficulty": 1,
+      "topics": [
+        "control-flow (if-else statements)",
+        "optional values",
+        "text formatting"
+      ]
+    },
     {
       "uuid": "e7351e8e-d3ff-4621-b818-cd55cf05bffd",
       "slug": "accumulate",

exercises/two-fer/README.md

@@ -0,0 +1,29 @@
+# Two-fer
+
+`Two-fer` or `2-fer` is short for two for one. One for you and one for me.
+
+```
+"One for X, one for me."
+```
+
+When X is a name or "you".
+
+If the given name is "Alice", the result should be "One for Alice, one for me."
+If no name is given, the result should be "One for you, one for me."
+
+### Submitting Exercises
+
+Note that, when trying to submit an exercise, make sure the solution is in the `exercism/python/<exerciseName>` directory.
+
+For example, if you're submitting `bob.py` for the Bob exercise, the submit command would be something like `exercism submit <path_to_exercism_dir>/python/bob/bob.py`.
+
+
+For more detailed information about running tests, code style and linting,
+please see the [help page](http://exercism.io/languages/python).
+
+## Source
+
+This is an exercise to introduce users to basic programming constructs, just after hello World. [https://en.wikipedia.org/wiki/Two-fer](https://en.wikipedia.org/wiki/Two-fer)
+
+## Submitting Incomplete Solutions
+It's possible to submit an incomplete solution so you can see how others have completed the exercise.

exercises/two-fer/example.py

@@ -0,0 +1,5 @@
+def two_fer(name=""):
+    if not name.strip():
+        return "One for you, one for me."
+    else:
+        return "One for %s, one for me." % name

exercises/two-fer/two_fer.py

@@ -0,0 +1,2 @@
+def two_fer():
+    pass

exercises/two-fer/two_fer_test.py

@@ -0,0 +1,18 @@
+import unittest
+
+import two_fer
+
+
+class Two_Fer_test(unittest.TestCase):
+    def test_empty(self):
+        self.assertEqual(two_fer.two_fer(), 'One for you, one for me.')
+
+    def test_eve(self):
+        self.assertEqual(two_fer.two_fer("Eve"), "One for Eve, one for me.")
+
+    def test_bob(self):
+        self.assertEqual(two_fer.two_fer("Bob"), "One for Bob, one for me.")
+
+
+if __name__ == '__main__':
+    unittest.main()