177 The += operator in python seems to be operating unexpectedly on lists. Can anyone tell me what is going on here?

NumPy's arrays are more compact than Python lists -- a list of lists as you describe, in Python, would take at least 20 MB or so, while a NumPy 3D array with single-precision floats in the cells would fit in …

In Python, when should you use lists and when tuples? Sometimes you don't have a choice, for example if you have "hello %s you are %s years old" % x then x must be a tuple. But if I am the one who

Closed 3 years ago. I'm basically looking for a python version of Combination of List<List<int>> Given a list of lists, I need a new list that gives all the possible combinations of items between the lists.

Python creating a dictionary of lists Asked 16 years, 6 months ago Modified 2 years, 10 months ago Viewed 637k times

Mar 19, 2019 · One common application for this technique is to avoid deeply nested loops. See Avoiding nested for loops for a more specific duplicate. Similarly, this technique might be used to "explode" a …

Sep 10, 2013 · 6 This will work for 2 or more lists; iterating through the list of lists, but using numpy addition to deal with elements of each list

Mar 9, 2009 · What are the differences between lists and tuples, and what are their respective advantages and disadvantages?

The colon, :, is what tells Python you're giving it a slice and not a regular index. That's why the idiomatic way of making a shallow copy of lists in Python 2 is

First, I strongly recommend that you rename your variable list to something else. list is the name of the built-in list constructor, and you're hiding its normal function. I will rename list to a in the following. …