Python work

python/rna-transcription/README.md

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+# Rna Transcription
+
+Given a DNA strand, return its RNA complement (per RNA transcription).
+
+Both DNA and RNA strands are a sequence of nucleotides.
+
+The four nucleotides found in DNA are adenine (**A**), cytosine (**C**),
+guanine (**G**) and thymine (**T**).
+
+The four nucleotides found in RNA are adenine (**A**), cytosine (**C**),
+guanine (**G**) and uracil (**U**).
+
+Given a DNA strand, its transcribed RNA strand is formed by replacing
+each nucleotide with its complement:
+
+* `G` -> `C`
+* `C` -> `G`
+* `T` -> `A`
+* `A` -> `U`
+
+### 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
+
+Rosalind [http://rosalind.info/problems/rna](http://rosalind.info/problems/rna)
+
+## Submitting Incomplete Solutions
+It's possible to submit an incomplete solution so you can see how others have completed the exercise.

python/rna-transcription/rna_transcription.py

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+def to_rna():
+    pass

python/rna-transcription/rna_transcription_test.py

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+import unittest
+
+from rna_transcription import to_rna
+
+
+# test cases adapted from `x-common//canonical-data.json` @ version: 1.0.0
+
+class DNATests(unittest.TestCase):
+    def test_transcribes_guanine_to_cytosine(self):
+        self.assertEqual(to_rna('G'), 'C')
+
+    def test_transcribes_cytosine_to_guanine(self):
+        self.assertEqual(to_rna('C'), 'G')
+
+    def test_transcribes_thymine_to_adenine(self):
+        self.assertEqual(to_rna('T'), 'A')
+
+    def test_transcribes_adenine_to_uracil(self):
+        self.assertEqual(to_rna('A'), 'U')
+
+    def test_transcribes_all_occurences(self):
+        self.assertMultiLineEqual(to_rna('ACGTGGTCTTAA'), 'UGCACCAGAAUU')
+
+    def test_correctly_handles_single_invalid_input(self):
+        self.assertEqual(to_rna('U'), '')
+
+    def test_correctly_handles_completely_invalid_input(self):
+        self.assertMultiLineEqual(to_rna('XXX'), '')
+
+    def test_correctly_handles_partially_invalid_input(self):
+        self.assertMultiLineEqual(to_rna('ACGTXXXCTTAA'), '')
+
+
+if __name__ == '__main__':
+    unittest.main()