for i in range()
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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