Understanding the difference between indexing and slicing: Wiki Python has this amazing picture which clearly distinguishes indexing and slicing. It is a list with six elements in it. To understand slicing better, consider that list as a set of six boxes placed together. Each box has an alphabet in it. Indexing is like dealing with the contents ...
The method you used is called Slicing in Python. Slicing syntax in python is as follows, [ <first element to include> : <first element to exclude> : <step> ] where adding the step part is optional. Here is a representation of how python list considers positive and negative index.
This creates a new list, it doesn't trim the existing one. To trim in-place, use del on a slice; e.g. del listobj[-x:] will remove the last x elements from the list object.
7 The slicing problem in C++ arises from the value semantics of its objects, which remained mostly due to compatibility with C structs. You need to use explicit reference or pointer syntax to achieve "normal" object behavior found in most other languages that do objects, i.e., objects are always passed around by reference.
It's using extended slicing - a string is a sequence in Python, and shares some methods with other sequences (namely lists and tuples). There are three parts to slicing - start, stop and step.
108 Slicing Python slicing is an incredibly fast operation, and it's a handy way to quickly access parts of your data. Slice notation to get the last nine elements from a list (or any other sequence that supports it, like a string) would look like this:
Slicing of a NumPy 2d array, or how do I extract an mxm submatrix from an nxn array (n>m)? Asked 15 years ago Modified 7 years, 3 months ago Viewed 270k times
