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```def pascals_triangle(n):
'''
Pascal's triangle:

for x in pascals_triangle(5):
print('{0:^16}'.format(x))

[1]
[1, 1]
[1, 2, 1]
[1, 3, 3, 1]
[1, 4, 6, 4, 1]
'''
x=[[1]]
for i in range(n-1):
x.append([sum(i) for i in zip([0]+x[-1],x[-1]+[0])])
return x
```

#### Diff to Previous Revision

```--- revision 4 2011-01-14 00:21:43
+++ revision 5 2011-01-14 00:29:05
@@ -1,23 +1,17 @@
def pascals_triangle(n):
+    '''
+    Pascal's triangle:
+
+    for x in pascals_triangle(5):
+        print('{0:^16}'.format(x))
+
+          [1]
+         [1, 1]
+       [1, 2, 1]
+      [1, 3, 3, 1]
+    [1, 4, 6, 4, 1]
+    '''
x=[[1]]
for i in range(n-1):
x.append([sum(i) for i in zip([0]+x[-1],x[-1]+[0])])
return x
-
-# Call it:
-
-for x in pascals_triangle(10):
-    print('{0:^39}'.format(x))
-
-# Output:
-
-                  [1]
-                [1, 1]
-               [1, 2, 1]
-             [1, 3, 3, 1]
-            [1, 4, 6, 4, 1]
-         [1, 5, 10, 10, 5, 1]
-       [1, 6, 15, 20, 15, 6, 1]
-     [1, 7, 21, 35, 35, 21, 7, 1]
-   [1, 8, 28, 56, 70, 56, 28, 8, 1]
-[1, 9, 36, 84, 126, 126, 84, 36, 9, 1]
```