: 是slice语法的定界符，用于“分割”序列中的子部分， [start:end]
[1:5] is equivalent to "from 1 to 5" (5 not included)
[1:] is equivalent to "1 to end"
[len(a):] is equivalent to "from length of a to end"
也适用于元组和字符串。
Python列表索引中的冒号（:)
Python列表索引中的冒号（:)
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