range()

range() 可以取一个范围内的数，返回一个列表

In [4]: range(10)        # 表示取10个数
Out[4]: [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]

In [5]: range(0,10)      # 表示从0取到10（不包括10）
Out[5]: [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]

In [6]: range(0,10,2)    # 每隔2个取一次
Out[6]: [0, 2, 4, 6, 8]

In [7]: range(0,10,3)    # 每隔3个取一次
Out[7]: [0, 3, 6, 9]

xrange() 用于与 range() 一致，range() 会直接打印出来，占用内存，而 xrange() 不会打印出来，只有遍历的时候才打印出来，因此不会占用内存

In [8]: range(10)
Out[8]: [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]

In [9]: xrange(10)
Out[9]: xrange(10)

时间： 2024-11-09 02:23:15

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