其他语言中，比如C＃，我们通常遍历数组是的方法是：
for (int i = 0; i list.Length; i++)
{
//todo with list[i]
}
for item in sequence: process(item)for index in range(len(sequence)): process(sequence[index])
for index, item in enumerate(sequence): process(index, item)
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