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GeeksforGeeks
geeksforgeeks.org โ€บ python โ€บ python-list-slicing
Python List Slicing - GeeksforGeeks
In Python, list slicing allows out-of-bound indexing without raising errors. If we specify indices beyond the list length then it will simply return the available items. Example: The slice a[7:15] starts at index 7 and attempts to reach index ...
Published ย  July 23, 2025
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Python Morsels
pythonmorsels.com โ€บ slicing
List slicing in Python - Python Morsels
March 8, 2024 - In Python, slicing looks like indexing with colons (:). You can slice a list (or any sequence) to get the first few items, the last few items, or all items in reverse.
Discussions

I am confused about Slicing a List.
No. players[0:3] means "start at index 0, go until index 3-1", so that's the first 3 elements of your list. If you want the last 3 you need to use negative indexes. print(players[-3:]) More on reddit.com
๐ŸŒ r/learnpython
17
February 11, 2025
slice - How slicing in Python works - Stack Overflow
Python is kind to the programmer if there are fewer items than you ask for. For example, if you ask for a[:-2] and a only contains one element, you get an empty list instead of an error. Sometimes you would prefer the error, so you have to be aware that this may happen. A slice object can represent ... More on stackoverflow.com
๐ŸŒ stackoverflow.com
Does array slicing [::] use extra memory?
Python list slicing should be creating a new list (use more memory). You can see the implementation of that here . I think what you read regarding slicing may be for NumPy arrays where slices create โ€œviewsโ€ and not copies. More on reddit.com
๐ŸŒ r/Python
9
3
December 13, 2021
Why choose to copy a list with slices instead of copy(), deepcopy(), or list()??
Does Python just have multiple ways to copy a list in the same way??? Although most of the approaches mentioned can be used to copy lists, that doesn't mean that's what they're for! Every operation has a different purpose: Using the slicing technique The purpose of slicing is to select an arbitrary subset of a list. Slices can be used to either obtain a copy of this subset, or to modify the selected subset. For example: foo = [1, 2, 3, 4, 5] print(foo[1:3]) # will print: [2, 3] foo[1:3] = ['a', 'b', 'c', 'd'] print(foo) # will print: [1, a, b, c, d, 4, 5] 2. Using the extend() method The purpose of extend is to add a whole other collection of items onto the end of an existing list. Although slicing can be used for this too, .extend() is less error prone since you don't have to worry about calculating the correct indexes. 3. List copy using =(assignment operator) Geeksforgeeks is wrong here. The = operator doesn't make a copy. Rather, you simply have two different variables refer to the exact same list. 4. Using the method of Shallow Copy Python's copy module wasn't made for lists. The copy() and deepcopy() functions are able to make copies of any arbitrary Python object. For example: from copy import copy class Person: def __init__(self, fname, lname): self.first_name = fname self.last_name = lname def print_greeting(self): print(f"Hello! My name is {self.first_name} {self.last_name}.") foo = Person("Jack", "Johnson") foo.print_greeting() # Will print: Hello! My name is Jack Johnson. bar = copy(foo) bar.print_greeting() # Will print: Hello! My name is Jack Johnson. foo.first_name = "John" foo.last_name = "Jackson" foo.print_greeting() # Will print: Hello! My name is John Jackson bar.print_greeting() # Will print: Hello! My name is Jack Johnson As you see, the copy operation actually made a copy of our Person object. The fact that it works for lists is just a consequence, but that doesn't make it the way of copying lists. 5. Using list comprehension List comprehensions are for constructing a new list based on the data in existing collections. Basically, they're meant to be a concise way to compose map() and filter() operations. You can also use it to quickly construct the cartesian product of multiple collections. 6. Using the append() method The append operation is simply for adding a single item onto a list. Nothing more. Manually writing your own for-loop to append items one by one is perhaps the most clucky & verbose way to copy a list. 7. Using the copy() method This is the only operation whose specific purpose is to copy a Python list. It's finely tuned just for that. Thus, it'll offer you the best performance. 8. Using the method of Deep Copy See #4. The deepcopy() function can make a copy of any arbitrary object, not just a list. 9. The list() function (not mentioned on geeksforgeeks). This is simply the list class constructor. Since 'list' is a class, it has to have a constructor, so might as well make it useful. It can accept any arbitrary collection - a set, a dictionary, a generator, a custom collection class, basically any object that has __iter__ defined on it. It uses the iterator interface to copy each item one by one into the new Python list. More on reddit.com
๐ŸŒ r/AskProgramming
11
1
November 3, 2022
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University of Pittsburgh
sites.pitt.edu โ€บ ~naraehan โ€บ python3 โ€บ mbb8.html
Python 3 Notes: List Slicing
Python 3 Notes [ HOME | LING 1330/2330 ] Tutorial 8: List Slicing << Previous Tutorial Next Tutorial >> On this page: slice indexing with [:], negative indexing, slice and negative indexing on strings. Video Tutorial Python 3 Changes print(x,y) instead of print x, y Python 2 vs.
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Python documentation
docs.python.org โ€บ 3 โ€บ library โ€บ stdtypes.html
Built-in Types โ€” Python 3.14.3 documentation
1 week ago - Further explanation is available in the FAQ entry How do I create a multidimensional list?. If i or j is negative, the index is relative to the end of sequence s: len(s) + i or len(s) + j is substituted. But note that -0 is still 0. The slice of s from i to j is defined as the sequence of items with index k such that i <= k < j.
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Sentry
sentry.io โ€บ sentry answers โ€บ python โ€บ slicing in python
Slicing in Python | Sentry
May 15, 2023 - The syntax for a simple slice is as follows: ... my_list = [0,1,2,3,4,5,6,7,8,9] start = 1 stop = 5 sublist = my_list[start:stop] # i.e. my_list[1:5] print(sublist) # will print "[1, 2, 3, 4]" Sequences in Python are 0-indexed, and slices are ...
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W3Schools
w3schools.com โ€บ python โ€บ numpy โ€บ numpy_array_slicing.asp
NumPy Array Slicing
Slicing in python means taking elements from one given index to another given index. We pass slice instead of index like this: [start:end].
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W3Schools
w3schools.com โ€บ python โ€บ python_strings_slicing.asp
Python - Slicing Strings
Remove List Duplicates Reverse a String Add Two Numbers ยท Python Examples Python Compiler Python Exercises Python Quiz Python Challenges Python Server Python Syllabus Python Study Plan Python Interview Q&A Python Bootcamp Python Certificate Python Training ... You can return a range of characters by using the slice syntax.
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W3Schools
w3schools.com โ€บ python โ€บ ref_func_slice.asp
Python slice() Function
Remove List Duplicates Reverse a String Add Two Numbers ยท Python Examples Python Compiler Python Exercises Python Quiz Python Challenges Python Server Python Syllabus Python Study Plan Python Interview Q&A Python Bootcamp Python Certificate Python Training ... Create a tuple and a slice object.
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TutorialsPoint
tutorialspoint.com โ€บ how-to-index-and-slice-lists-in-python
How to index and slice lists in Python?
But in Python, we start counting from 0, not 1. So here is the indexing of apple, banana, and mango - ... Now, if you want more than one item from the list, then you can use the slicing() method. This means picking a part of the list with the help of start and end positions. In this article, we will discuss how to index and slice lists in Python.
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GeeksforGeeks
geeksforgeeks.org โ€บ python โ€บ python-lists
Python Lists - GeeksforGeeks
List comprehension is a concise way to create lists using a single line of code. It is useful for applying an operation or filter to items in an iterable, such as a list or range. ... In Python, a list doesnโ€™t store actual values directly. Instead, it stores references (pointers) to objects in memory.
Published ย  January 10, 2026
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Python documentation
docs.python.org โ€บ 3 โ€บ tutorial โ€บ datastructures.html
5. Data Structures โ€” Python 3.14.3 documentation
There is a way to remove an item from a list given its index instead of its value: the del statement. This differs from the pop() method which returns a value. The del statement can also be used to remove slices from a list or clear the entire list (which we did earlier by assignment of an empty list to the slice).
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LinkedIn
linkedin.com โ€บ pulse โ€บ python-fundamentals-beginners-slicing-lists-muhammad-hadir-khan
Python Fundamentals for Beginners: (Slicing in Lists)
August 10, 2018 - So our list will be sliced from 0 index position till 3rd index position. There is another little trick we can do with this syntax. If we want to start the slicing from the first index position then rather specifying the starting index position as 0 we can omit the value completely and Python will automatically start slicing from the first position.
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Polars
docs.pola.rs โ€บ py-polars โ€บ html โ€บ reference โ€บ api โ€บ polars.concat.html
polars.concat โ€” Polars documentation
Combine multiple DataFrames, LazyFrames, or Series into a single object ยท DataFrames, LazyFrames, or Series to concatenate
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The Python Coding Stack
thepythoncodingstack.com โ€บ p โ€บ a-python-slicing-story
A Slicing Story - by Stephen Gruppetta
September 24, 2023 - You can read more about __getitem__() in The Manor House, the Oak-Panelled Library, the Vending Machine, and Python's `__getitem__()`. In this new class called TestList, which inherits from list, you first print the value and data type of the argument in the __getitem__() method, and then you call the list's __getitem__() method and return its value. This is what super().__getitem__(item) does since list is the superclass for TestList. The syntax 2:7 within the square brackets represents a slice object.
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Railsware
railsware.com โ€บ home โ€บ engineering โ€บ indexing and slicing for lists, tuples, strings, other sequential types in python
Python Indexing and Slicing for Lists, Tuples, Strings, other Sequential Types | Railsware Blog
January 22, 2025 - In short, slicing is a flexible tool to build new lists out of an existing list. Python supports slice notation for any sequential data type like lists, strings, tuples, bytes, bytearrays, and ranges.
Top answer
1 of 16
6656

The syntax is:

a[start:stop]  # items start through stop-1
a[start:]      # items start through the rest of the array
a[:stop]       # items from the beginning through stop-1
a[:]           # a copy of the whole array

There is also the step value, which can be used with any of the above:

a[start:stop:step] # start through not past stop, by step

The key point to remember is that the :stop value represents the first value that is not in the selected slice. So, the difference between stop and start is the number of elements selected (if step is 1, the default).

The other feature is that start or stop may be a negative number, which means it counts from the end of the array instead of the beginning. So:

a[-1]    # last item in the array
a[-2:]   # last two items in the array
a[:-2]   # everything except the last two items

Similarly, step may be a negative number:

a[::-1]    # all items in the array, reversed
a[1::-1]   # the first two items, reversed
a[:-3:-1]  # the last two items, reversed
a[-3::-1]  # everything except the last two items, reversed

Python is kind to the programmer if there are fewer items than you ask for. For example, if you ask for a[:-2] and a only contains one element, you get an empty list instead of an error. Sometimes you would prefer the error, so you have to be aware that this may happen.

Relationship with the slice object

A slice object can represent a slicing operation, i.e.:

a[start:stop:step]

is equivalent to:

a[slice(start, stop, step)]

Slice objects also behave slightly differently depending on the number of arguments, similar to range(), i.e. both slice(stop) and slice(start, stop[, step]) are supported. To skip specifying a given argument, one might use None, so that e.g. a[start:] is equivalent to a[slice(start, None)] or a[::-1] is equivalent to a[slice(None, None, -1)].

While the :-based notation is very helpful for simple slicing, the explicit use of slice() objects simplifies the programmatic generation of slicing.

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728

The Python tutorial talks about it (scroll down a bit until you get to the part about slicing).

The ASCII art diagram is helpful too for remembering how slices work:

 +---+---+---+---+---+---+
 | P | y | t | h | o | n |
 +---+---+---+---+---+---+
   0   1   2   3   4   5
  -6  -5  -4  -3  -2  -1

One way to remember how slices work is to think of the indices as pointing between characters, with the left edge of the first character numbered 0. Then the right edge of the last character of a string of n characters has index n.

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Python documentation
docs.python.org โ€บ 3 โ€บ reference โ€บ expressions.html
6. Expressions โ€” Python 3.14.3 documentation
2 weeks ago - A more advanced form of subscription, slicing, is commonly used to extract a portion of a sequence. In this form, the subscript is a slice: up to three expressions separated by colons.
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Bas
bas.codes โ€บ posts โ€บ python-slicing
A Comprehensive Guide to Slicing in Python - Bas codes
January 31, 2022 - Since weโ€™re using Nones, the slice object needs to calculate the actual index values based on the length of our sequence. Therefore, to get our index triple, we need to pass the length to the indices method, like so: ... This will give us the triple (0, 6, 2). We now can recreate the loop like so: sequence = list("Python") start = 0 stop = 6 step = 2 i = start while i != stop: print(sequence[i]) i = i+step
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LabEx
labex.io โ€บ tutorials โ€บ python-how-to-slice-a-python-list-398068
How to slice a Python list | LabEx
List slicing is a powerful technique in Python that allows you to extract a subset of elements from a list. It's a concise and efficient way to access and manipulate list data. ... my_list = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10] ## Slice from index ...