cleaning up and organizing old problems (builtin)

src/builtin_structures/simple_str_comprension.py

@@ -0,0 +1,34 @@
+#!/usr/bin/env python
+
+__author__ = "bt3"
+
+
+from collections import Counter
+
+def str_comp(s):
+    '''
+    >>> s1 = 'aabcccccaaa'
+    >>> str_comp(s1)
+    'a2b1c5a3'
+    >>> str_comp('')
+    ''
+    '''
+
+    count, last = 1, ''
+    list_aux = []
+    for i, c in enumerate(s):
+        if last == c:
+            count += 1
+        else:
+            if i != 0:
+                list_aux.append(str(count))
+            list_aux.append(c)
+            count = 1
+            last = c
+    list_aux.append(str(count))
+    return ''.join(list_aux)
+
+
+if __name__ == '__main__':
+    import doctest
+    doctest.testmod()