for i in [1, 2, 4, 5]:
print(i)
#输出
1
2
4
5
是一种迭代写法，就是 i 从 in 后面的 可迭代对象 每次取一个元素出来赋给 i 然后执行循环里面的代码。
for i in range ()作用：
range()是一个函数， for i in range () 就是给i赋值：
比如
for i in range (1，3)：
print(i)
就是把1,2依次赋值给i
0
1
2
range () 函数的使用是这样的:
range(start, stop[, step])，分别是起始、终止和步长
range（3）即：从0到3，不包含3，即0,1,2
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