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Bookmark or Share- list - what does [::-1] mean in python - slicing? - Stack OverflowSlicing. Negative numbers for start and stop mean "from the end". It's essianlly equivalent of len-value. Negative number for step means "in reverse order". Empty start means 0 i.e. 1st element. Empty stop means len. Stop parameter is exclusive! So [::-1] means from 1st element to last element in steps of 1 in reverse order. If you have [start ...
- Array slices in C# - Stack OverflowThe benefit of the new System.Memory system is that it doesn't need copying around data. The method you need is Slice: Span
slice = foo.Slice(0, 40); A lot of methods now support Span and IReadOnlySpan, so it will be very straightforward to use this new type. - c++ - What is object slicing? - Stack OverflowThe short answers is that you slice the object by assigning a derived object to a base object by value, i.e. the remaining object is only a part of the derived object. In order to preserve value semantics, slicing is a reasonable behavior and has its relatively rare uses, which doesn't exist in most other languages.
- slice - How slicing in Python works - Stack OverflowHere is the logical equivalent code in Python. This function takes a Python object and optional parameters for slicing and returns the start, stop, step, and slice length for the requested slice. def py_slice_get_indices_ex(obj, start=None, stop=None, step=None): length = len(obj) if step is None: step = 1.
- How to take column-slices of dataframe in pandasThe labels being the values of the index or the columns. Slicing with .loc includes the last element. Let's assume we have a DataFrame with the following columns: foo, bar, quz, ant, cat, sat, dat. # selects all rows and all columns beginning at 'foo' up to and including 'sat' df.loc[:, 'foo':'sat'] # foo bar quz ant cat sat
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