Caveats Linear time-complexity in list length An index call checks every element of the list in order, until it finds a match. If the list is long, and if there is no guarantee that the value will be near the …

14 I wasn't happy with any of these approaches, so I came up with a Flexlist class that allows for flexible indexing, either by integer, slice or index-list:

The range here enumerates elements of your list and since we want only those where self.states is True, we are applying a filter based on this condition. For Python > 3.0:

List indexes of -x mean the xth item from the end of the list, so n[-1] means the last item in the list n. Any good Python tutorial should have told you this. It's an unusual convention that only a few other …

"In Python, you wouldn't use indexes for this at all, but just deal with the values" this statement shows you haven't done enough data analysis and machine learning modeling. Indices of one tensor based …

Apr 18, 2015 · The following approach returns the True result for index == 0 and for negative index values (if such an index is valid for the list, for example listIn[-2] for [0, 1, 2]):

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...

Now lets say I want to identify a certain value in this list. If I know the index of the 1st and 2nd dimesion but don't know the zero-th index for the value I want, how do I go about finding the zero-th index?

The best method to solve this problem is to enumerate the list, which will give you a tuple that contains the index and the item. Using enumerate, that would be done as follows. In Python 3:

Here's the timeit comparison of all the answers with list of 1000 elements on Python 3.9.1 and Python 2.7.16. Answers are listed in the order of performance for both the Python versions.