官方文档释义：Called to implement evaluation of self[key]. For sequence types, the accepted keys should be integers and slice objects. Note that the special interpretation of negative indexes (if the class wishes to emulate a sequence type) is up to the __getitem__() method. If key is of...
官方文档释义:Called to implement evaluation of self[key]. For sequence types, the accepted keys should be integers and slice objects. Note that the special interpretation of negative indexes (if the class wishes to emulate a sequence type) is up to themethod. If key is of an inappropriate t...
slice_object = slice(3) print(py_string[slice_object]) # Pyt # start = 1, stop = 6, step = 2 # contains 1, 3 and 5 indices slice_object = slice(1, 6, 2) print(py_string[slice_object]) # yhn Output Pyt yhn Example 3: Get substring using negative index py_string = 'Pytho...
Python list slice negative step With a negative step, we take every nth element from the end. The start index must be greater than the end index. main.py #!/usr/bin/python vals = [-2, -1, 0, 1, 2, 3, 4, 5, 6] print(vals[5:0:-2]) print(vals[::-2]) print(vals[::...
切片(slice)就是一种截取索引片段的技术,借助切片技术,我们可以十分灵活地处理序列类型的对象。通常来说,切片的作用就是截取序列对象,然而,对于非序列对象,我们是否有办法做到切片操作呢?在使用切片的过程中,有什么要点值得重视,又有什么底层原理值得关注呢?本文将主要跟大家一起...
官方文档释义:Called to implement evaluation of self[key]. For sequence types, the accepted keys should be integers and slice objects. Note that the special interpretation of negative indexes (if the class wishes to emulate a sequence type) is up to the__getitem__()method. If key is of an...
.__getslice__(i, j) <==> x[i:j] Use of negative indices is not supported. """ pass def __ge__(self, y): # real signature unknown; restored from __doc__ """ x.__ge__(y) <==> x>=y """ pass def __gt__(
切片(slice)就是一种截取索引片段的技术,借助切片技术,我们可以十分灵活地处理序列类型的对象。通常来说,切片的作用就是截取序列对象,然而,对于非序列对象,我们是否有办法做到切片操作呢?在使用切片的过程中,有什么要点值得重视,又有什么底层原理值得关注呢?本文将主要跟大家一起来探讨这些内容,希望我能与你共同学习进...
带有负索引的切片 (Slice with Negative Indices) 可以在切片列表时指定负索引。 Example: Slice from index -7 to -2 L = ['a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i'] print(L[-7:-2]) # ['c', 'd', 'e', 'f', 'g'] ...
Output:lroWollHere the index values are taken from end to start. The substring is made from indexes 1 to 7 from end to start. s1 = s[8:1:-2] print(s1) Output:lool Python slice works with negative indexes too, in that case, the start_pos is excluded and end_pos is included in ...