python3 列表生成式
'''列表生成式可以快速的创建一个列表'''
lst = [i*i for i in range(10)]
print(lst)
lst2 = [i if i < 5 else i*i for i in range(10)]
print(lst2)
lst3 = [i*i for i in range(10) if i >= 5]
print(lst3)
lst4 = [i for i in ["apple", "orange", "banana", "pear"] if i.endswith("e")]
print(lst4)
'''使用列表推导式得到[1, 4, 9, 16, 25, 36]'''
print([i*i for i in range(1, 7)])
'''在[3,6,9]的基础上推到出[[1,2,3], [4,5,6],[7,8,9]]'''
print([[i-2, i-1, i] for i in [3, 6, 9]])
返回结果:
[0, 1, 4, 9, 16, 25, 36, 49, 64, 81]
[0, 1, 2, 3, 4, 25, 36, 49, 64, 81]
[25, 36, 49, 64, 81]
['apple', 'orange']
[1, 4, 9, 16, 25, 36]
[[1, 2, 3], [4, 5, 6], [7, 8, 9]]
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