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```def pascals_triangle(n):
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]
```

#### Diff to Previous Revision

```--- revision 3 2011-01-14 00:20:22
+++ revision 4 2011-01-14 00:21:43
@@ -1,23 +1,23 @@
-    def pascals_triangle(n):
-        x=[[1]]
-        for i in range(n-1):
-            x.append([sum(i) for i in zip([0]+x[-1],x[-1]+[0])])
-        return x
+def pascals_triangle(n):
+    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))
+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]
+                  [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]
```