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 ...

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]

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 …

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. …

Apr 16, 2024 · 825 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, …

Jul 14, 2012 · I'm trying to make a list with numbers 1-1000 in it. Obviously this would be annoying to write/read, so I'm attempting to make a list with a range in it. In Python 2 it seems that: …

Why is the output of the following two list comprehensions different, even though f and the lambda function are the same? f = lambda x: x*x [f(x) for x in range(10)] and [lambda x: x*x for x in r...

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:

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 …

Dec 16, 2011 · How can I create a list which contains only zeros? I want to be able to create a zeros list for each int in range(10) For example, if the int in the range was 4 I will get: [0,0,0,0] …