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python/isogram/README.md

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+# Isogram
+
+Determine if a word or phrase is an isogram.
+
+An isogram (also known as a "nonpattern word") is a word or phrase without a repeating letter.
+
+Examples of isograms:
+
+- lumberjacks
+- background
+- downstream
+
+The word *isograms*, however, is not an isogram, because the s repeats.
+
+### 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
+
+Wikipedia [https://en.wikipedia.org/wiki/Isogram](https://en.wikipedia.org/wiki/Isogram)
+
+## Submitting Incomplete Solutions
+It's possible to submit an incomplete solution so you can see how others have completed the exercise.

python/isogram/isogram.py

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+def is_isogram():
+    pass

python/isogram/isogram_test.py

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+import unittest
+
+from isogram import is_isogram
+
+
+# test cases adapted from `x-common//canonical-data.json` @ version: 1.1.0
+
+class TestIsogram(unittest.TestCase):
+
+    def test_empty_string(self):
+        self.assertTrue(is_isogram(""))
+
+    def test_isogram_with_only_lower_case_characters(self):
+        self.assertTrue(is_isogram("isogram"))
+
+    def test_word_with_one_duplicated_character(self):
+        self.assertFalse(is_isogram("eleven"))
+
+    def test_longest_reported_english_isogram(self):
+        self.assertTrue(is_isogram("subdermatoglyphic"))
+
+    def test_word_with_duplicated_character_in_mixed_case(self):
+        self.assertFalse(is_isogram("Alphabet"))
+
+    def test_hypothetical_isogrammic_word_with_hyphen(self):
+        self.assertTrue(is_isogram("thumbscrew-japingly"))
+
+    def test_isogram_with_duplicated_non_letter_character(self):
+        self.assertTrue(is_isogram("Hjelmqvist-Gryb-Zock-Pfund-Wax"))
+
+    def test_made_up_name_that_is_an_isogram(self):
+        self.assertTrue(is_isogram("Emily Jung Schwartzkopf"))
+
+    def test_duplicated_character_in_the_middle(self):
+        self.assertFalse(is_isogram("accentor"))
+
+
+if __name__ == '__main__':
+    unittest.main()