Data commit

Task/Run-length-encoding/Python/run-length-encoding-1.py

@@ -0,0 +1,33 @@
+def encode(input_string):
+    count = 1
+    prev = None
+    lst = []
+    for character in input_string:
+        if character != prev:
+            if prev:
+                entry = (prev, count)
+                lst.append(entry)
+            count = 1
+            prev = character
+        else:
+            count += 1
+    else:
+        try:
+            entry = (character, count)
+            lst.append(entry)
+            return (lst, 0)
+        except Exception as e:
+            print("Exception encountered {e}".format(e=e))
+            return (e, 1)
+
+def decode(lst):
+    q = []
+    for character, count in lst:
+        q.append(character * count)
+    return ''.join(q)
+
+#Method call
+value = encode("aaaaahhhhhhmmmmmmmuiiiiiiiaaaaaa")
+if value[1] == 0:
+    print("Encoded value is {}".format(value[0]))
+    decode(value[0])

Task/Run-length-encoding/Python/run-length-encoding-2.py

@@ -0,0 +1,9 @@
+from itertools import groupby
+def encode(input_string):
+    return [(len(list(g)), k) for k,g in groupby(input_string)]
+
+def decode(lst):
+    return ''.join(c * n for n,c in lst)
+
+encode("aaaaahhhhhhmmmmmmmuiiiiiiiaaaaaa")
+decode([(5, 'a'), (6, 'h'), (7, 'm'), (1, 'u'), (7, 'i'), (6, 'a')])

Task/Run-length-encoding/Python/run-length-encoding-3.py

@@ -0,0 +1,22 @@
+from re import sub
+
+def encode(text):
+    '''
+    Doctest:
+        >>> encode('WWWWWWWWWWWWBWWWWWWWWWWWWBBBWWWWWWWWWWWWWWWWWWWWWWWWBWWWWWWWWWWWWWW')
+        '12W1B12W3B24W1B14W'
+    '''
+    return sub(r'(.)\1*', lambda m: str(len(m.group(0))) + m.group(1),
+               text)
+
+def decode(text):
+    '''
+    Doctest:
+        >>> decode('12W1B12W3B24W1B14W')
+        'WWWWWWWWWWWWBWWWWWWWWWWWWBBBWWWWWWWWWWWWWWWWWWWWWWWWBWWWWWWWWWWWWWW'
+    '''
+    return sub(r'(\d+)(\D)', lambda m: m.group(2) * int(m.group(1)),
+               text)
+
+textin = "WWWWWWWWWWWWBWWWWWWWWWWWWBBBWWWWWWWWWWWWWWWWWWWWWWWWBWWWWWWWWWWWWWW"
+assert decode(encode(textin)) == textin