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# Manipulating Lists and Tuples
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| def add_layer(triangle): | |
| # Add a layer to Pascal's triangle. | |
| # Each layer should be a tuple. | |
| last = triangle[-1] | |
| newTuple = [] | |
| for i in range(len(last)): | |
| newTuple.append(last[i] + last[i-1]) | |
| newTuple.append(1) | |
| triangle.append(tuple(newTuple)) | |
| pass |
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