[英]Getting index out of range error. What is the correct way to declare a 2D list?
第一個代碼:
l1 = [[0, 3, 4], [1, 2]]
l2 = ['cat', 'dog', 'hen', 'bull', 'tac']
l3 = [[]] * len(l1)
for i in range(len(l1)):
for j in range(len(l1[i])):
l3[i].insert(j,l2[l1[i][j]])
print(l3)
第二個代碼:
l1 = [[0, 3, 4], [1, 2]]
l2 = ['cat', 'dog', 'hen', 'bull', 'tac']
l3 = [[], []]
for i in range(len(l1)):
for j in range(len(l1[i])):
l3[i].insert(j,l2[l1[i][j]])
print(l3)
我想要第二個代碼中的輸出。 但我不希望 l3 為[[],[]]
。 如何在第一個代碼中定義 l3 以便我不會得到任何索引超出范圍錯誤。
l1=[[0,3,4],[1,2]]
l2=['cat','dog','hen','bull','tac']
l3=[[] for i in range(len(l1))]
for i in range(len(l1)):
for j in range(len(l1[i])):
l3[i].insert(j,l2[l1[i][j]])
print(l3)
# output [['cat', 'bull', 'tac'], ['dog', 'hen']]
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