- Initialize List lt;List lt;Integer gt; gt; in Java - Stack Overflow
1 You can initialize this as List<ArrayList<Integer>> list = new ArrayList<ArrayList<Integer>>(); Note that the inner List has to be an implementation of the List interface, e g , ArrayList Since List is an interface, one can't have objects of the type List itself
- 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
- What is the difference between list and list [:] in python?
When reading, list is a reference to the original list, and list[:] shallow-copies the list When assigning, list (re)binds the name and list[:] slice-assigns, replacing what was previously in the list Also, don't use list as a name since it shadows the built-in
- How to group dataframe rows into list in pandas groupby
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?
- List all environment variables from the command line
Is it possible to list all environment variables from a Windows' command prompt? Something equivalent to PowerShell's gci env: (or ls env: or dir env:)
- How do I reverse a list or loop over it backwards? - Stack Overflow
How do I iterate over a list in reverse in Python? See also: How can I get a reversed copy of a list (avoid a separate statement when chaining a method after reverse)?
- Get a list from Pandas DataFrame column headers - Stack Overflow
I want to get a list of the column headers from a Pandas DataFrame The DataFrame will come from user input, so I won't know how many columns there will be or what they will be called For example
- How do I clone a list so that it doesnt change unexpectedly after . . .
While using new_list = my_list, any modifications to new_list changes my_list every time Why is this, and how can I clone or copy the list to prevent it? For example: >>> my_list = [1, 2,
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