Yahoo Web Search

Search results

1. Top results related to list in python

   • List of non-zero elements in a list in Python

     Top Answer

     Answered May 23, 2017 · 11 votes

     List comprehension method:

     a = [6, 3, 0, 0, 1, 0]b = [1 if i else 0 for i in a]print b>>> [1, 1, 0, 0, 1, 0]

     Timing mine, Dave's method and Lattyware's slight alteration:

     $ python3 -m timeit -s "a = [6, 3, 0, 0, 1, 0]" "[1 if i else 0 for i in a]"1000000 loops, best of 3: 0.838 usec per loop$ python3 -m timeit -s "a = [6, 3, 0, 0, 1, 0]" "[int(i != 0) for i in a]"100000 loops, best of 3: 2.15 usec per loop$ python3 -m timeit -s "a = [6, 3, 0, 0, 1, 0]" "[i != 0 for i in a]"1000000 loops, best of 3: 0.794 usec per loop

     Looks like my method is twice as fast ... I am actually surprised it is that much faster. Taking out the int() call, however, makes the two essentially the same - but leaves the resulting list full of Booleans instead of Integers (True/False instead of 1/0)

     Other Answers

     Answered May 27, 2013 · 5 votes

     b = [int(i != 0) for i in a]-

     Will give you what you are looking for.

     Other Answers

     Answered May 27, 2013 · 2 votes

     For completeness, and since no one else added this answer:

     b = map(bool, a)-

     But it returns Boolean values and not Integers.

     Check all answers on Stack Overflow

     1/5

   • List membership in Python without "in"

     Top Answer

     Answered Oct 24, 2010 · 3 votes

     Recursive solution:

     def is_member(value, array): if len(array) == 0: return False return value == array[0] or is_member(value, array[1:])-

     Check all answers on Stack Overflow

     2/5

   • Python | Insert list in another list

     The problem of inserting a number at any index is a quite common one. But sometimes we require to insert the whole list into another list. These kinds of problems occur in Machine Learning while playing with data. Let’s discuss certain ways in which this problem can be solved.

     Method #1: Using insert() + loop In this method, we insert one element by 1 at a time using the insert function. This way we add all the list elements at the specified index in other list. 

     Step-by-step approach:

     Use the insert() method of the test_list to insert each element of the insert_list at the appropriate position, calculated using the formula i + pos, where i is the index of the current element in the insert_list....

     • Use a for loop to iterate over the elements of the insert_list.
     • Use the insert() method of the test_list to insert each element of the insert_list at the appropriate position, calculated using the formula i + pos, where i is the index of the current element in the insert_list.

     Check all answers on Geeksforgeeks

     3/5

   • List | in Python | Question 1

     Which of the following would give an error?

     (A)

     list1=[]

     (B)

     list1=[]*3

     (C)

     list1=[2,8,7]

     (D)

     None of the above

     Answer: (D) Explanation:

     None of the above will result in error.

     Quiz of this Question Please comment below if you find anything wrong in the above post

     Check all answers on Geeksforgeeks

     4/5

   • Also try

     linked list in python	how to append to a list in python
     how to sort a list in python	length of list in python
     how to make a list in python	nested list in python
     how to reverse a list in python	how to create a list in python

     5/5

   Show moreShow less

2. www.w3schools.com › python › python_listsPython Lists - W3Schools

   www.w3schools.com › python › python_lists

   • Cached

   Lists are used to store multiple items in a single variable. Lists are one of 4 built-in data types in Python used to store collections of data, the other 3 are Tuple, Set, and Dictionary, all with different qualities and usage. Lists are created using square brackets:

3. www.geeksforgeeks.org › python-listsPython Lists - GeeksforGeeks

   www.geeksforgeeks.org › python-lists

   • Cached

   Jun 19, 2024 · Python list is a built-in data structure in Python used to store a collection of items. Lists are mutable, means they can be changed after they are created.

4. www.programiz.com › python-programming › listPython List (With Examples) - Programiz

   www.programiz.com › python-programming › list

   • Cached

   Python lists store multiple data together in a single variable. In this tutorial, we will learn about Python lists (creating lists, changing list items, removing items, and other list operations) with the help of examples.

5. realpython.com › python-listPython's list Data Type: A Deep Dive With Examples

   realpython.com › python-list

   • Cached

   Jul 19, 2023 · Table of Contents. Getting Started With Python’s list Data Type. Constructing Lists in Python. Creating Lists Through Literals. Using the list () Constructor. Building Lists With List Comprehensions. Accessing Items in a List: Indexing. Retrieving Multiple Items From a List: Slicing. Creating Copies of a List. Aliases of a List.

6. www.freecodecamp.org › news › how-to-use-lists-in-pythonHow to Use Lists in Python – Explained with Example Code

   www.freecodecamp.org › news › how-to-use-lists-in-python

   • Cached

   Mar 1, 2024 · A Python list is a dynamic, mutable, ordered collection of elements enclosed within square brackets []. These elements, called items or values, can be of different data types – numbers, strings, booleans, and even other lists (creating nested structures).

7. python.land › python-data-types › python-listPython List: How To Create, Sort, Append, Remove, And More

   python.land › python-data-types › python-list

   • Cached

   Jun 24, 2024 · The Python list is not just a list, but can also be used as a stack and even a queue. In this article, I’ll explain everything you might possibly want to know about Python lists: how to create lists, modify them, how to sort lists, loop over elements of a list with a for-loop or a list comprehension, how to slice a list, append to Python lists,

8. www.freecodecamp.org › news › lists-in-python-comprehensive-guideLists in Python – A Comprehensive Guide - freeCodeCamp.org

   www.freecodecamp.org › news › lists-in-python-comprehensive-guide

   • Cached

   Jun 3, 2021 · How Lists Work in Python. It’s quite natural to write down items on a shopping list one below the other. For Python to recognize our list, we have to enclose all list items within square brackets ([ ]), with the items separated by commas. Here’s an example where we create a list with 6 items that we’d like to buy.

9. pythonbasics.org › listPython Lists (With Examples) - Python Tutorial

   pythonbasics.org › list

   • Cached

   Python Lists (With Examples) List can be seen as a collection: they can hold many variables. List resemble physical lists, they can contain a number of items. A list can have any number of elements. They are similar to arrays in other programming languages.

10. datagy.io › python-listPython Lists: A Complete Overview • datagy

    datagy.io › python-list

    • Cached

    Dec 7, 2021 · December 7, 2021. In this tutorial, you’ll learn all you need to know to get started with Python lists. You’ll learn what lists are and how they can be used to store data. You’ll also learn how to access data from within lists by slicing and indexing data. You’ll learn how to add data to lists and as well as how to delete items.

11. www.pythontutorial.net › python-basics › python-listPython List - An Essential Guide to the Python List for Beginners

    www.pythontutorial.net › python-basics › python-list

    • Cached

    Python List. Summary: in this tutorial, you’ll learn about Python List type and how to manipulate list elements effectively. What is a List. A list is an ordered collection of items. Python uses the square brackets ( []) to indicate a list. The following shows an empty list: empty_list = [] Code language: Python (python)