tasks a-s

Task/Pascals-triangle/Python/pascals-triangle-1.py

@@ -0,0 +1,9 @@
+def pascal(n):
+   """Prints out n rows of Pascal's triangle.
+   It returns False for failure and True for success."""
+   row = [1]
+   k = [0]
+   for x in range(max(n,0)):
+      print row
+      row=[l+r for l,r in zip(row+k,k+row)]
+   return n>=1

Task/Pascals-triangle/Python/pascals-triangle-2.py

@@ -0,0 +1,17 @@
+def scan(op, seq, it):
+  a = []
+  result = it
+  a.append(it)
+  for x in seq:
+    result = op(result, x)
+    a.append(result)
+  return a
+
+def pascal(n):
+    def nextrow(row, x):
+        return [l+r for l,r in zip(row+[0,],[0,]+row)]
+
+    return scan(nextrow, range(n-1), [1,])
+
+for row in pascal(4):
+    print(row)