Python list elements except

Python Exercises: Sum of all list elements except current element

Write a Python program to add all elements of a list of integers except the number at index. Return the updated string.

Example: ([1, 2, 3]) -> [1+2+3-1, 1+2+3-2, 1+2+3-3]
-> [5, 4, 3].

Sample Data:
([0, 9, 2, 4, 5, 6] -> [26, 17, 24, 22, 21, 20]
([-4, 0, 6, 1, 0, 2]) -> [9, 5, -1, 4, 5, 3]
([1, 2, 3]) -> [5, 4, 3]
([-4, 0, 5, 1, 0, 1]) -> [7, 3, -2, 2, 3, 2]

Sample Solution-1:

Python Code:

def test(nums): return [sum(nums)-(x) for x in nums] nums = [0, 9, 2, 4, 5, 6] print("Original list:") print(nums) print("Sum of said list elements except current element:\n", test(nums)) nums = [-4, 0, 6, 1, 0, 2] print("\nOriginal list:") print(nums) print("Sum of said list elements except current element:\n", test(nums)) nums = [1, 2, 3] print("\nOriginal list:") print(nums) print("Sum of said list elements except current element:\n", test(nums)) nums = [-4, 0, 5, 1, 0, 1] print("\nOriginal list:") print(nums) print("Sum of said list elements except current element:\n", test(nums)) 

Original list: [0, 9, 2, 4, 5, 6] Sum of said list elements except current element: [26, 17, 24, 22, 21, 20] Original list: [-4, 0, 6, 1, 0, 2] Sum of said list elements except current element: [9, 5, -1, 4, 5, 3] Original list: [1, 2, 3] Sum of said list elements except current element: [5, 4, 3] Original list: [-4, 0, 5, 1, 0, 1] Sum of said list elements except current element: [7, 3, -2, 2, 3, 2]

Visualize Python code execution:

The following tool visualize what the computer is doing step-by-step as it executes the said program:

Sample Solution-2:

Python Code:

def test(nums): result = [] for x in range(len(nums)): n = sum(nums[x+1:] + nums[:x]) print(n) result.append(n) return result nums = [0, 9, 2, 4, 5, 6] print("Original list:") print(nums) print("Sum of said list elements except current element:\n", test(nums)) nums = [-4, 0, 6, 1, 0, 2] print("\nOriginal list:") print(nums) print("Sum of said list elements except current element:\n", test(nums)) nums = [1, 2, 3] print("\nOriginal list:") print(nums) print("Sum of said list elements except current element:\n", test(nums)) nums = [-4, 0, 5, 1, 0, 1] print("\nOriginal list:") print(nums) print("Sum of said list elements except current element:\n", test(nums)) 

Original list: [0, 9, 2, 4, 5, 6] 26 17 24 22 21 20 Sum of said list elements except current element: [26, 17, 24, 22, 21, 20] Original list: [-4, 0, 6, 1, 0, 2] 9 5 -1 4 5 3 Sum of said list elements except current element: [9, 5, -1, 4, 5, 3] Original list: [1, 2, 3] 5 4 3 Sum of said list elements except current element: [5, 4, 3] Original list: [-4, 0, 5, 1, 0, 1] 7 3 -2 2 3 2 Sum of said list elements except current element: [7, 3, -2, 2, 3, 2]

Visualize Python code execution:

The following tool visualize what the computer is doing step-by-step as it executes the said program:

Python Code Editor:

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Python: Tips of the Day

Converting string into datetime:

datetime.strptime is the main routine for parsing strings into datetimes. It can handle all sorts of formats, with the format determined by a format string you give it:

from datetime import datetime datetime_object = datetime.strptime('Jun 1 2005 1:33PM', '%b %d %Y %I:%M%p')

The resulting datetime object is timezone-naive.

• Python documentation for strptime: Python 2, Python 3
• Python documentation for strptime/strftime format strings: Python 2, Python 3
• strftime.org is also a really nice reference for strftime

• strptime = «string parse time»
• strftime = «string format time»
• Pronounce it out loud today & you won’t have to search for it again in 6 months.

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Источник

Python List Print All Elements Except First Example

I am going to show you example of python list get all elements except first. if you want to see example of python list get all but not first element then you are a right place. We will use python all items in list except first. you can see python all elements except first. Follow bellow tutorial step of python print all elements in list except first.

There are many ways to get all elements except the first element in list python. i will give you two examples using for loop with list[1:] to except first element from list. so let’s see the below examples.

You can use these examples with python3 (Python 3) version.

let’s see below a simple example with output:

myList = [1, 2, 3, 4, 5] # Get All Value Except First One myList = myList[1:] print(myList)

myList = ["One", "Two", "Three", "Four", "Five"] # Get All Value Except First One for listElem in myList[1:]: print(listElem)

Hardik Savani

I’m a full-stack developer, entrepreneur and owner of Aatman Infotech. I live in India and I love to write tutorials and tips that can help to other artisan. I am a big fan of PHP, Laravel, Angular, Vue, Node, Javascript, JQuery, Codeigniter and Bootstrap from the early stage. I believe in Hardworking and Consistency.

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Источник

Python – Traverse List except Last Element

To traverse Python List except for the last element, there are two ways.

• Get a copy of the list without last element and traverse this list using a looping statement.
• Use index and length of list to traverse the list until the last element, but not executing the loop for the last element.

In this tutorial, we will go through examples for these two approaches.

Examples

1. Traverse List except last element using Slicing

In this example, we will use the first approach that we mentioned above.

We can use slicing to get the list without last element, and then use for loop or while loop to traverse the elements.

Python Program

source_list = [8, 4, 7, 3, 6, 1, 9] for x in source_list[:-1]: print(x)

We have traversed the list except for the last element.

2. Traverse List except last element using index

In this example, we will use the second approach that we mentioned during introduction.

We can use index to access Python List elements, and use while loop to traverse through them. To traverse through list except for the last element, we have to check the condition if the index is less than the list length by one, and stop traversing when the condition fails.

Python Program

source_list = [8, 4, 7, 3, 6, 1, 9] index = 0 while index < len(source_list) - 1: print(source_list[index]) index += 1

Summary

In this tutorial of Python Examples, we learned how to traverse through Python List except for the last element, using slicing and index.

Источник

Python List Print All Elements Except Last Example

This tutorial will give you an example of python list get all elements except last. you'll learn python list get all but not last element. I explained simply step by step python all items in list except last. you'll learn python all elements except last. follow the below step for python to print all elements in list except last.

There are many ways to get all elements except the last element in list python. i will give you two examples using for loop with list[:-1] to except last element from list. so let's see the below examples.

You can use these examples with python3 (Python 3) version.

let's see below a simple example with output:

myList = [1, 2, 3, 4, 5] # Get All Value Except Last One myList = myList[:-1] print(myList)

myList = ["One", "Two", "Three", "Four", "Five"] # Get All Value Except Last One for listElem in myList[:-1]: print(listElem)

Hardik Savani

I'm a full-stack developer, entrepreneur and owner of Aatman Infotech. I live in India and I love to write tutorials and tips that can help to other artisan. I am a big fan of PHP, Laravel, Angular, Vue, Node, Javascript, JQuery, Codeigniter and Bootstrap from the early stage. I believe in Hardworking and Consistency.

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• How to Convert List into String in Python?
• Python Split String into List of Characters Example
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Источник