Python3 range()方法

>>> range(1,20)  #代表从1到20(不包含20)

[1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19]

>>> range(1,20,3)  #代表从1到20，间隔3(不包含20)

[1, 4, 7, 10, 13, 16, 19]

>>> range(1,20,4)  #代表从1到20，间隔4(不包含20)

[1, 5, 9, 13, 17]

>>> range(20)  #代表从0到20(不包含20)

[0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19]