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Meaning of list[-1] in Python - Stack Overflow I have a piece of code here that is supposed to return the least common element in a list of elements, ordered by commonality: def getSingle(arr): from collections import Counter c = Counte
Python: list of lists - Stack Overflow The first, [:], is creating a slice (normally often used for getting just part of a list), which happens to contain the entire list, and thus is effectively a copy of the list The second, list(), is using the actual list type constructor to create a new list which has contents equal to the first list
slice - How slicing in Python works - Stack Overflow The first way works for a list or a string; the second way only works for a list, because slice assignment isn't allowed for strings Other than that I think the only difference is speed: it looks like it's a little faster the first way Try it yourself with timeit timeit () or preferably timeit repeat ()
Get list from pandas dataframe column or row? - Stack Overflow However, it looks like tolist() is optimized for columns of Python scalars because I found that calling list() on a column was 10 times slower than calling tolist() For the record, I was trying to convert a column of json strings in a very large dataframe into a list and list() was taking its sweet time
Array versus List lt;T gt;: When to use which? - Stack Overflow A List uses an internal array to handle its data, and automatically resizes the array when adding more elements to the List than its current capacity, which makes it more easy to use than an array, where you need to know the capacity beforehand
What is the difference between List. of and Arrays. asList? @Sandy Chapman: List of does return some ImmutableList type, its actual name is just a non-public implementation detail If it was public and someone cast it to List again, where was the difference? Where is the difference to Arrays asList, which returns a non-public List implementation, that throws an exception when attempting add or remove, or the list returned by Collections
How to cast List lt;Object gt; to List lt;MyClass gt; - Stack Overflow (List<Customer>)(Object)list; you must be sure that at runtime the list contains nothing but Customer objects Critics say that such casting indicates something wrong with your code; you should be able to tweak your type declarations to avoid it But Java generics is too complicated, and it is not perfect Sometimes you just don't know if there is a pretty solution to satisfy the compiler
. net - Creating a List of Lists in C# - Stack Overflow A list of lists would essentially represent a tree structure, where each branch would constitute the same type as its parent, and its leaf nodes would represent values
Sum a list of numbers in Python - Stack Overflow Depending on how big your list is, several orders of magnitude faster Also, it's a lot less code, and at least to me, it's easier to read I'm trying to make a habit out of using numpy for all groups of numbers, and it is a huge improvement to all the loops and loops-within-loops I would otherwise have had to write