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亲爱的您，这里是LearningYard学苑。今天小编为大家带来“学习知多少（python篇）：切片”，欢迎您的访问。
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Dear you, this is The LearningYard Academy. Today Xiaobian brings you "Learn how much to know (python):slice”, welcome your visit.
在python中切片是重要操作之一，它主要用于截取列表中的元素，也可以通过切片来修改和删除列表中部分元素或者通过切片在列表中追加元素。
Slicing is one of the important operations in python, it is mainly used to intercept elements in the list, you can also modify and delete some elements in the list by slicing or append elements to the list by slicing.
一个完整的切片表达式包含两个“:”，用于分隔三个参数(start_index、end_index、step)。当只有一个“:”时，默认第三个参数step=1；当一个“:”也没有时，start_index=end_index，表示切取start_index指定的那个元素。
A complete slice expression contains two ":" to separate the three parameters (start_index, end_index, step). When there is only one ":", the third parameter step=1 is defaulted; when there is no ":", start_index=end_index, indicating that the element specified by the start_index is cut.
step：正负数均可，其绝对值大小决定了切取数据时的‘‘步长”，而正负号决定了“切取方向”，正表示“从左往右”取值，负表示“从右往左”取值。当step省略时，默认为1，即从左往右以步长1取值。“切取方向非常重要！”“切取方向非常重要！”“切取方向非常重要！”，重要的事情说三遍！
Step: Both positive and negative numbers, the absolute size of which determines the "step size" when cutting data, and positive and negative determine the "cutting direction", positive means "left to right" value, negative means "right to left" value. When step is omitted, the default is 1, that is, the value of step 1 is taken from left to right. "Cutting the direction is very important!" "Cutting the direction is very important!" "Cutting the direction is very important!" , say important things three times!
start_index：表示起始索引（包含该索引对应值）；该参数省略时，表示从对象“端点”开始取值，至于是从“起点”还是从“终点”开始，则由step参数的正负决定，step为正从“起点”开始，为负从“终点”开始。
start_index: Indicates the starting index (including the corresponding value of the index); When this parameter is omitted, it means that the value is taken from the "end point" of the object, and whether it starts from the "starting point" or from the "end point" is determined by the positive and negative of the step parameter, step is positive from the "starting point", and negative starts from the "end point".
end_index：表示终止索引（不包含该索引对应值）；该参数省略时，表示一直取到数据“端点”，至于是到“起点”还是到“终点”，同样由step参数的正负决定，step为正时直到“终点”，为负时直到“起点”。
end_index: indicates that the index is terminated (excluding the corresponding value of the index); When this parameter is omitted, it means that it is taken all the way to the "end point" of the data, and whether it is to the "starting point" or to the "end point" is also determined by the positive and negative of the step parameter, step is positive until the "end point", and negative time until the "starting point".
1、使用切片获取列表部分元素
1. Use slices to get some elements of the list
2、使用切片为列表增加元素
2. Use slices to add elements to the list
3、使用切片替换和修改列表元素
3. Use slices to replace and modify list elements
4、使用切片删除列表中的元素
4. Use slices to delete elements in the list、
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翻译来源于谷歌翻译
部分来源于
百度文库
清华大学出版 董付国《Python程序设计基础》
编辑&排版|百味
审核|闫庆红
