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1. Top results related to what is list in python

   • What is a list semanitcs in python?

     Top Answer

     Answered Nov 06, 2017 · 1 votes

     The term semantics is sometimes used in a programming context to describe the set of behaviors an object has. So in this case, as Zero mentioned in his comment, it means "has the same behaviors as a list".

     You could alternately interpret the phrase as "is a list-like thing" or "is interacted with the same way you would a list object".

     The term semantics means "meaning". In the case of an object, its meaning comprises "what you can do with it" and how. In this case you can do "list-like" things with it, like iterate its members with for x in xs, get its length with len(xs), and access elements by index with xs[i].

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     1/5

   • What is "homogenous" in Python list documentation?

     Top Answer

     Answered Nov 01, 2013 · 12 votes

     Homogeneous means "of the same or a similar kind or nature".

     While any value can be stored in a list along with any other value, in doing so the definition of "kind or nature" must be widened when dealing with the sequence. During this widening (or "unification"), the set of operations that can be performed upon every item in the sequence becomes the "lowest common set of operations" shared between all items.

     This is why "[list are] typically used to store collections of homogeneous items" - so the items in the sequence can be treated with an appropriate level of unification:

     # a list of animals that can "speak"animals = [Dog(), Cat(), Turkey()]for a in animals: a.speak()-# .. but a string cannot "speak"animals = [Dog(), "Meow!", Turkey()]-

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   • What is the difference between list and list[:] in python?

     Top Answer

     Answered Nov 02, 2010 · 102 votes

     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.

     Other Answers

     Answered Nov 02, 2010 · 32 votes

     The latter is a reference to a copy of the list and not a reference to the list. So it's very useful.

     >>> li = [1,2,3]>>> li2 = li>>> li3 = li[:]>>> li2[0] = 0>>> li[0, 2, 3]>>> li3[1, 2, 3]-

     Other Answers

     Answered Jul 09, 2012 · 6 votes

     li[:] creates a copy of the original list. But it does not refer to the same list object. Hence you don't risk changing the original list by changing the copy created by li[:].

     for example:

     >>> list1 = [1,2,3]>>> list2 = list1>>> list3 = list1[:]>>> list1[0] = 4>>> list2[4, 2, 3]>>> list3[1, 2, 3]-

     Here list2 is changed by changing list1 but list3 doesn't change.

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     3/5

   • What is the best practice to initialize an empty list in python ([] or list())?

     Top Answer

     Answered May 23, 2020 · 3 votes

     [] is the pythonic way. [] way is quite efficient as you can see from below image.

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     4/5

   • in python what is the difference between map(func,list) and [func(x) for x in list]

     Top Answer

     Answered Mar 23, 2012 · 6 votes

     The right way to do this would be

     [y + 1 for y in range(4)]-

     No need to construct a lambda function here. Your code would unnecessarily build a new function object in every single iteration of the list comprehension.

     That said, you can write any call to map() as an equivalent list comprehension. If the first argument to map() is a lambda function, the list comprehension is usually preferred. If the first argument to map() is a function name, both variants are fine. Some people (including me) prefer, say,

     map(str, my_list)-

     while others prefer

     [str(x) for x in my_list]-

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     5/5

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

   www.w3schools.com › python › python_lists

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   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

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   • Video Duration: 11 min

   • Creating a List in Python. Lists in Python can be created by just placing the sequence inside the square brackets[]. Unlike Sets, a list doesn’t need a built-in function for its creation of a list.
   • Accessing elements from the List. In order to access the list items refer to the index number. Use the index operator [ ] to access an item in a list. The index must be an integer.
   • Getting the size of Python list. Python len() is used to get the length of the list. Python3. List1 = [] print(len(List1)) List2 = [10, 20, 14] print(len(List2))
   • Taking Input of a Python List. We can take the input of a list of elements as string, integer, float, etc. But the default one is a string. Example 1: Python3.

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

   realpython.com › python-list

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   Jul 19, 2023 · Getting Started With Python’s list Data Type. Python’s list is a flexible, versatile, powerful, and popular built-in data type. It allows you to create variable-length and mutable sequences of objects. In a list, you can store objects of any type. You can also mix objects of different types within the same list, although list elements often ...

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

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   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).

6. www.freecodecamp.org › news › lists-in-pythonLists in Python – A Comprehensive Guide - freeCodeCamp.org

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

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   Jun 3, 2021 · Python also has a built-in data structure called List that’s very similar to your shopping list. This post is a beginner-friendly tutorial on Python lists. Over the next few minutes, we'll get to know lists and cover some of the most common operations such as slicing through lists and modifying them using list methods.

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

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

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   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)

8. People also ask

   How do you create a list in Python?

   • In Python programming, a list is created by placing all the items (elements) inside square brackets [], separated by commas. It can have any number of items and they may be of different types (integer, float, string etc.).

   Python List. How to create a list? | by Razia Khan | Medium

   medium.com/@raziakhan0810/python-list-2934ab32dd8

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   What are some of the methods associated with a Python list?

   • Python List provides different methods to add items to a list. 1. Using append () The append () method adds an item at the end of the list. For example, numbers = [21, 34, 54, 12] print("Before Append:", numbers) # using append method numbers.append (32) print("After Append:", numbers)

   Python List (With Examples) - Programiz

   www.programiz.com/python-programming/list

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   What are the benefits of using a list in Python?

   • Sets are the iterable and mutable unordered collection of data types in Python. Python uses lists to store the sequential order of different kinds of data. Because Python lists are mutable types, we can change their elements after they’ve been generated.

   How To Convert A Set To A List In Python - Python Guides

   pythonguides.com/convert-a-set-to-a-list-in-python/

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

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

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   Jun 5, 2022 · 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,