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  1. l1 = [[1, 2], [3, 4]]
  2. l2 = [[0]*4]*4
  3. for i in range(2):
  4. 	for j in range(2):
  5. 		l2[i][j] = l1[i][j] * - 1
  6. print(l2)
Success #stdin #stdout 0.1s 10104KB
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[[-3, -4, 0, 0], [-3, -4, 0, 0], [-3, -4, 0, 0], [-3, -4, 0, 0]]
https://ideone.com/cT4qWG
language:
Python 3 (python  3.9.5)
created:
10 years ago
visibility:
public

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