2019-09-12 10:33:56 -07:00
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>>> def identity(size):
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... return {(x, y):int(x == y) for x in range(size) for y in range(size)}
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...
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>>> size = 4
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>>> matrix = identity(size)
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>>> print('\n'.join(' '.join(str(matrix[(x, y)]) for x in range(size)) for y in range(size)))
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1 0 0 0
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0 1 0 0
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0 0 1 0
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0 0 0 1
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>>>
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