A-M baby

Task/Look-and-say-sequence/Python/look-and-say-sequence-1.py

@@ -0,0 +1,22 @@
+def lookandsay(number):
+    result = ""
+
+    repeat = number[0]
+    number = number[1:]+" "
+    times = 1
+
+    for actual in number:
+        if actual != repeat:
+            result += str(times)+repeat
+            times = 1
+            repeat = actual
+        else:
+            times += 1
+
+    return result
+
+num = "1"
+
+for i in range(10):
+    print num
+    num = lookandsay(num)

Task/Look-and-say-sequence/Python/look-and-say-sequence-2.py

@@ -0,0 +1,9 @@
+>>> from itertools import groupby
+>>> def lookandsay(number):
+	return ''.join( str(len(list(g))) + k
+		        for k,g in groupby(number) )
+
+>>> numberstring='1'
+>>> for i in range(10):
+	print numberstring
+	numberstring = lookandsay(numberstring)

Task/Look-and-say-sequence/Python/look-and-say-sequence-3.py

@@ -0,0 +1,20 @@
+>>> from itertools import groupby, islice
+>>>
+>>> def lookandsay(number='1'):
+	while True:
+		yield number
+		number = ''.join( str(len(list(g))) + k
+		                  for k,g in groupby(number) )
+
+		
+>>> print('\n'.join(islice(lookandsay(), 10)))
+1
+11
+21
+1211
+111221
+312211
+13112221
+1113213211
+31131211131221
+13211311123113112211

Task/Look-and-say-sequence/Python/look-and-say-sequence-4.py

@@ -0,0 +1,9 @@
+import re
+
+def lookandsay(str):
+    return re.sub(r'(.)\1*', lambda m: str(len(m.group(0))) + m.group(1), str)
+
+num = "1"
+for i in range(10):
+    print num
+    num = lookandsay(num)