In python, as far as I know, there are at least 3 to 4 ways to create and initialize lists of a given size: Simple loop with append: my_list = [] for i in range(50): my_list.append(0) Simple ...

54 Create a dictionary with list comprehension in Python I like the Python list comprehension syntax. Can it be used to create dictionaries too? For example, by iterating over pairs of keys and values:

How do I create an empty list that can hold 10 elements? After that, I want to assign values in that list. For example: xs = list() for i in range(0, 9): xs[i] = i However, that gives IndexError:

Aug 16, 2013 · How do I create a list of numbers between two values? For example, a list between 11 and 16: [11, 12, 13, 14, 15, 16]

With Python 2.7, I can get dictionary keys, values, or items as a list:

Dec 16, 2011 · You'd expect that when you create a list of lists that all the lists are different from one another while they're actually references to the same list. This doesn't matter with integers since you …

May 20, 2014 · I am pulling a subset of data from a column based on conditions in another column being met. I can get the correct values back but it is in pandas.core.frame.DataFrame. How do I convert …

Given a dataframe, I want to groupby the first column and get second column as lists in rows, so that a dataframe like: a b A 1 A 2 B 5 B 5 B 4 C 6 becomes A [1,2] B [5,5,4] C [6] How do I do this?

Apr 16, 2024 · 827 I want to create a series of lists, all of varying lengths. Each list will contain the same element e, repeated n times (where n = length of the list). How do I create the lists, without using a …

Aug 19, 2021 · Is it possible to create a list of integers with a single line of code, without using any third-party libraries? I tried with the syntax: lst = list(int(1234)) or the syntax: lst = list(int(1,2,3,...