for i in range()就是python中的循环语句

有以下三种常见用法:

  1、range(3)  [0,3)即0,1,2

  2、range(1,3)  [1,3)即1,2

  3、range(1,5,2)  [1,5)范围内每次增加2,即1,3

          1+2=3,3+2=5(不包含)

    第三个参数表示步长step

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