You must specify a non-negative integer. 必須指定非負整數。
The resulting value must be a nonnegative integer less than the sequence's length, and the sequence is asked to assign the assigned object to its item with that index. 最後的值必須是一個小於該序列長度的非負整數，然後該序列就被請求將被賦對象賦值給它帶那個指標的項。
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