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I have two large lists train and keep, with the latter containing unique elements, for e.g. train =… Read more Keep All Elements In One List From Another

I cannot add the integer number 1 to an existing set. In an interactive shell, this is what I am do… Read more Adding The Number 1 To A Set Has No Effect

I am parsing two big files (Gb size order), that each contains keys and corresponding values. Some … Read more Python Iteration Order On A Set

I recently posted a question using a lambda function and in a reply someone had mentioned lambda is… Read more Lambda Versus List Comprehension Performance

Working in Python, given a list of N sets of integers from the range range(s,n), how can I build a … Read more Grouping Integers By Set Membership In Python

I have 2D list in python list = [[9, 2, 7], [9, 7], [2, 7], [1, 0], [0, 5, 4]] I would like to get… Read more How Can I Get Union Of 2d List Items When There Occurs Any Intersection (in Efficient Way)?

I'm attempting to create a program which selects 10 words from a text file which contains 10+ w… Read more Importing Random Words From A File Without Duplicates Python

I was trying to find the second largest number in a list and thought of converting list into set, a… Read more Find A Second Largest Number In A Python List

Trying to learn Python I encountered the following: >>> set('spam') - set('ham… Read more Please Explain "set Difference" In Python

I would like to get an element from a frozenset (without modifying it, of course, as frozensets are… Read more How To Get An Arbitrary Element From A Frozenset?

Does anyone know about a fast OrderedSet implementation for python that: remembers insertion order… Read more Python Orderedset With .index() Method

i have been trying to figure out an effective algorithm that returns a set such as it's interse… Read more Generating A Set From Given Sets Such It's Intersection With All The Sets Is Different From {}

list(set(a[0]) & set(a[1]) & set(a[2]) & set(a[3]) & set(a[4])) Does anyone know h… Read more List Comprehension And Intersection Problem

I got the following error AttributeError: 'NoneType' object has no attribute 'add'… Read more Attributeerror: 'nonetype' Object Has No Attribute 'add'

I have two files one has key and other has both key and value. I have to match the key of file one … Read more Dict And List Manipulation Python

Java's Set.add function will return a boolean value, which is true if the set did not already c… Read more Python's Equivalent Of Java's Set.add()?

For example: I have the intervals = [[-5,-3],[-4,-1],[1,3],[4,8],[5,10],[10,12], [15,20]] (not nece… Read more I Want To Input A List Of Intervals And Check The Intervals Of The Union Of Overlapping Intervals And The Intervals Of Non-overlapping Intervals

I have a list that is generated from multiple lists. This combined list contains names that are gen… Read more Case Insensitive For Sets In Python

What is the algorithmic runtime of Python 2.7's isDisjoint(other) method for sets? Is it faster… Read more Python Isdisjoint() Runtime

I expected the following two tuples >>> x = tuple(set([1, 'a', 'b', 'c… Read more Why Are Tuples Constructed From Differently Initialized Sets Equal?