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列表练习

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#1 Created at ... [Delete] [Delete and Lock User]

L = [

    ['Apple', 'Google', 'Microsoft'],

    ['Java', 'Python', 'Ruby', 'PHP'],

    ['Adam', 'Bart', 'Lisa']

]

print(L[0][0])

print(L[1][1])

print(L[-1][-1])

.

#2 Created at ... [Delete] [Delete and Lock User]

-1，那我在后面临时添加了一个元素，-1还怎么获取Lisa呢

1

#3 Created at ... [Delete] [Delete and Lock User]

不能这样说 那我第一个insert一个元素，那2也不是Lisa了

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