[Python] challenge 12 (Unreviewed)

challenge_12/python/mindm/README.md

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+# Challenge_12
+## Compression and Decompression I
+These methods handle string compression and decompression.
+The input can contain any characters but only alphabethicals are compressed.
+
+These methods use re-library, which is a builtin.
+
+You can run tests with:
+```
+$ python3 test.py
+```

challenge_12/python/mindm/src/compression.py

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+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+import re
+
+
+def sub_com(matchobj):
+    """ Calculates the compressed string from the first letter of the match
+        and the length of the match
+    """
+    letter = matchobj.group(0)[0]
+    length = len(matchobj.group(0))
+    return "{}#{}".format(letter, length)
+
+
+def sub_def(matchobj):
+    """ Decompresses the match by multiplying the first character by the
+        digit after the hash character
+    """
+    letter = matchobj.group(0)[0]
+    length = int(matchobj.group(0)[2:])
+    return "{}".format(letter * length)
+
+
+def compress(input):
+    """ Compresses string using 're'-library
+    """
+    out = re.sub(r'(.)\1\1\1+', sub_com, input)
+    return out
+
+
+def decompress(input):
+    """ Decompresses string using 're'-library
+    """
+    out = re.sub(r'([A-Za-z]#\d+)', sub_def, input)
+    return out

challenge_12/python/mindm/src/test.py

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+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+import unittest
+import random
+from compression import compress, decompress
+
+
+class TestComp(unittest.TestCase):
+
+    def test_1(self):
+        self.assertEqual(decompress("a#5"), "aaaaa")
+
+    def test_2(self):
+        self.assertEqual(compress("abbcccddddeeeee"), "abbcccd#4e#5")
+
+    def test_3(self):
+        original = "aliiiiicia foooooooohx"
+        compressed = compress(original)
+        decompressed = decompress(compressed)
+        self.assertEqual(original, decompressed)
+
+    def test_long(self):
+        self.assertEqual(compress("fooooooooooooooox"), "fo#15x")
+
+    def test_long2(self):
+        self.assertEqual(decompress("fo#15x"), "fooooooooooooooox")
+
+if __name__ == '__main__':
+    unittest.main()