The most natural way is to use a list comprehension:
mylist = [ 1, 2, 3, -7]
myneglist = [ -x for x in mylist]
print(myneglist)
Gives
[-1, -2, -3, 7]
GeeksforGeeks
geeksforgeeks.org › python › python-program-to-print-negative-numbers-in-a-list
Python program to print negative numbers in a list - GeeksforGeeks
A traditional for loop can be used to iterate through the list and print negative numbers directly. Python · a = [5, -3, 7, -1, 2, -9, 4] for num in a: if num < 0: print(num) Output · -3 -1 -9 · Explanation: "for loop" iterates through each ...
Published: November 13, 2025
Negative Indexes in Lists
if you would want the last 3 items without knowing the length of the list. [-3:] More on reddit.com
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October 26, 2024python - Negative list index? - Stack Overflow
It's an unusual convention that only a few other languages besides Python have adopted, but it is extraordinarily useful; in any other language you'll spend a lot of time writing n[n.length-1] to access the last item of a list. More on stackoverflow.com
Generate list of numbers and their negative counterparts in Python - Stack Overflow
Is there a convenient one-liner to generate a list of numbers and their negative counterparts in Python? For example, say I want to generate a list with the numbers 6 to 9 and -6 to -9. My current More on stackoverflow.com
how do I create a python list with a negative index - Stack Overflow
Additionally, you are attempting to write to a list at indices of it that don't already exist (never mind the fact that you want them to be negative - negative indices have a special meaning in Python) - this would be a problem if execution ever entered the body of the loop. More on stackoverflow.com
01:16
PYTHON TUTORIAL | NEGATIVE INDEX IN PYTHON | ACCESS LIST ELEMENTS ...
00:51
What's a negative index in python? #python #pythonforbeginners ...
03:04
Negative Indexing lists in Python to prevent index out of range ...
Python #10: Positive & Negative Indexing || Slicing & Splicing ...
06:23
Python Indexes Explained | How to Use Negative Indexes in Python ...
01:11
Negative Indexing in Python Lists with Example - YouTube
AskPython
askpython.com › python › list › negative-indexing
Negative Indexing in Python List - How to Use "-1" Parameter - AskPython
April 4, 2023 - The process of indexing from the opposite end is called Negative Indexing. In negative Indexing, the last element is represented by -1. ... We have a built-in function reverse() in Python to reverse a list, let’s take a look.
Reddit
reddit.com › r/learnpython › negative indexes in lists
r/learnpython on Reddit: Negative Indexes in Lists
October 26, 2024 -
I see how useful using the -1 index can be for lists but is there any world where you’d actually need to use a -3 index (in a list of 4) etc. instead of the zero index? I’m new to coding so I want to learn as much as possible but I’m not sure of any case (as of right now) where this would be necessary.
Top answer 1 of 5
37
if you would want the last 3 items without knowing the length of the list. [-3:]
2 of 5
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I use it quite often because I am often handling file names. It's useful to extract the file extension from the string because the rest of the file name changes lebgth. Or a lot of my files have date/time information that I want to extract.
GeeksforGeeks
geeksforgeeks.org › python › python-negative-index-of-element-in-list
Python - Negative index of Element in List - GeeksforGeeks
July 23, 2025 - List is reversed using reversed() ... in the reversed list. Negative index is obtained by negating the result of the index in the reversed list and subtracting one to adjust for the reversed order....
Quora
quora.com › How-do-I-see-the-negative-index-of-an-element-in-a-list-in-Python
How to see the negative index of an element in a list in Python - Quora
Quora is a place to gain and share knowledge. It's a platform to ask questions and connect with people who contribute unique insights and quality answers.
Top answer 1 of 2
239
Negative numbers mean that you count from the right instead of the left. So, list[-1] refers to the last element, list[-2] is the second-last, and so on.
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List indexes of -x mean the xth item from the end of the list, so n[-1] means the last item in the list n. Any good Python tutorial should have told you this.
It's an unusual convention that only a few other languages besides Python have adopted, but it is extraordinarily useful; in any other language you'll spend a lot of time writing n[n.length-1] to access the last item of a list.
Statistics Globe
statisticsglobe.com › home › python programming language for statistics & data science › what means a negative list index in python? (2 examples)
What Means a Negative List Index in Python? (Indexing Example)
March 29, 2023 - A negative list index simply means indexing from the end. While Python lists are typically indexed from the front, i.e., from 0, it is also possible to index them from the rear.
Top answer 1 of 14
69
I am unsure if order matters, but you could create a tuple and unpack it in a list comprehension.
nums = [y for x in range(6,10) for y in (x,-x)]
print(nums)
[6, -6, 7, -7, 8, -8, 9, -9]
2 of 14
63
Create a nice and readable function:
def range_with_negatives(start, end):
for x in range(start, end):
yield x
yield -x
Usage:
list(range_with_negatives(6, 10))
That is how you get a convenient one-liner for anything. Avoid trying to look like a magic pro hacker.
Tutorial Gateway
tutorialgateway.org › python-program-to-print-negative-numbers-in-a-list
Python Program to Print Negative Numbers in a List
September 4, 2018 - Please enter the Total Number of List Elements: 5 Please enter the Value of 1 Element : 12 Please enter the Value of 2 Element : -13 Please enter the Value of 3 Element : -15 Please enter the Value of 4 Element : 3 Please enter the Value of 5 Element : -22 Negative Numbers in this List are : -13 -15 -22
TutorialsPoint
tutorialspoint.com › python-program-to-print-negative-numbers-in-a-list
Count positive and negative numbers in a list in Python program
July 4, 2020 - numbers = [1, -2, -4, 6, 7, -23, 45, 0] pos_count, neg_count = 0, 0 for num in numbers: if num >= 0: pos_count += 1 else: neg_count += 1 print("Positive numbers in the list:", pos_count) print("Negative numbers in the list:", neg_count)
Educative
educative.io › answers › how-to-remove-negative-numbers-from-a-list-in-python
How to remove negative numbers from a list in Python
Removing negative values. Let's discuss three simple methods to achieve the expected output. We use a for loop to iterate over the list and execute the code in it that is to be applied to every element of the list.
ItSolutionstuff
itsolutionstuff.com › post › how-to-get-only-negative-values-in-python-listexample.html
How to Get Only Negative Values in Python List? - ItSolutionstuff.com
October 30, 2023 - You can use these examples with python3 (Python 3) version. ... # Create New List with Item myList = [-3, -2, -1, 1, 2, 3, 4, 5, 6, 7] # Python list get positive values newList = [item for item in myList if item < 0] print(newList)
Tutorial Gateway
tutorialgateway.org › python-program-to-put-positive-and-negative-numbers-in-separate-list
Python Program to Put Positive and Negative Numbers in Separate List
December 19, 2024 - Based on the result, we are appending that item to the Positive list or the Negative list. # Python Program to Put Positive and Negative Numbers in Separate List NumList = [] Positive = [] Negative = [] Number = int(input("Please enter the Total Number of List Elements : ")) for i in range(1, Number + 1): value = int(input("Please enter the Value of %d Element : " %i)) NumList.append(value) for j in range(Number): if(NumList[j] >= 0): Positive.append(NumList[j]) else: Negative.append(NumList[j]) print("Element in Positive List is : ", Positive) print("Element in Negative List is : ", Negative)
Knowledgehills
knowledgehills.com › python › negative-indexing-slicing-stepping-comparing-lists.htm
Python Lists – Negative Indexing, Slicing, Stepping, Comparing, Max and Min – Knowledge Hills
The fifth print combines slicing with a negative step. The output of this third print statement will print all elements starting from ending element to the beginning element. Basically the reverse of the list. This stackoverflow discussion is very useful if you like to understand more about slicing. Also this python ...
Top answer 1 of 5
3
If you are using Quantopian, it is advisable that you become familiar with numpy and pandas. For example:
>>> import numpy as np
>>> -1*np.arange(20)
array([ 0, -1, -2, -3, -4, -5, -6, -7, -8, -9, -10, -11, -12,
-13, -14, -15, -16, -17, -18, -19])
Then you will have a[1]==-1, a[5]==-5, etc.
2 of 5
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the only thing that strikes me is
for i in xrange( -20, 0, -1 ):
seems very wrong since the third argument is step size... you will go -1 per step starting at -20, means next number is -21
and the following is a syntax error
a = []
a[0] = 5
you should do a = [None]*20
Educative
educative.io › answers › what-is-negative-indexing-in-python
What is negative indexing in Python?
In the example above, to select the element 60 that is placed at the end of the list, we can use the index -1. For element 15, we can use the index -2 and so on. Note: Negative indexes start from index number -1, while positive indexes start from index number 0.
Spark By {Examples}
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Negative Index of List in Python - Spark By {Examples}
May 31, 2024 - How to get a negative index of an element from the list in Python? A negative index of a list in Python refers to accessing elements in a list by counting
EITCA
eitca.org › home › how do negative indexes work in python when accessing elements in a list?
How do negative indexes work in Python when accessing elements in a list? - EITCA Academy
August 3, 2023 - In Python, lists are zero-indexed, meaning that the first element is at index 0, the second element at index 1, and so on. Negative indexes, on the other hand, start from -1, where -1 represents the last element in the list, -2 represents the second-to-last element, and so forth.
Finxter
blog.finxter.com › home › learn python blog › negative indexing in python
What is Negative Indexing in Python? - Be on the Right Side of Change
November 11, 2023 - In Python, negative indexing lets you count backwards from the end of a list. So, -1 is the last item, -2 is the second to last, and so on. It’s like starting at the end of a line of people and moving backwards to find someone.