## Sum one number to every element in a list (or array) in Python

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Here I go with my basic questions again, but please bear with me.

In Matlab, is fairly simple to add a number to elements in a list:

a = [1,1,1,1,1] b = a + 1

`b`

then is `[2,2,2,2,2]`

In python this doesn't seem to work, at least on a list.

Is there a simple fast way to add up a single number to the entire list.

Thanks

if you want to operate with list of numbers it is better to use NumPy arrays:

import numpy a = [1, 1, 1 ,1, 1] ar = numpy.array(a) print ar + 2

gives

[3, 3, 3, 3, 3]

**Sum one number to every element in a list (or array) in Python ,** While working with the Python lists, we can come over a situation in which we require to add the integer k to each element in the list. We possibly need to iterate and add k to each element but that would increase the line of code. Let's discuss certain shorthands to perform this task. Method #1 : Using List Comprehension In Matlab, is fairly simple to add a number to elements in a list: a = [1,1,1,1,1] b = a + 1 b then is [2,2,2,2,2] In python this doesn’t seem to work, at least on a list. Is there a simple fast way to add up a single number to the entire list. Thanks

using List Comprehension:

>>> L = [1]*5 >>> [x+1 for x in L] [2, 2, 2, 2, 2] >>>

which roughly translates to using a for loop:

>>> newL = [] >>> for x in L: ... newL+=[x+1] ... >>> newL [2, 2, 2, 2, 2]

or using map:

>>> map(lambda x:x+1, L) [2, 2, 2, 2, 2] >>>

**Python,** sum list. The list is an important container and used almost in every code of day-day Given a list of lists, the program to suppose to return the sum as the final list. Let's see some of the methods to sum a list of list and return list. Method # 1: Using Naive method A numpy is a general-purpose array-processing package. Python program to find sum of elements in list Given a list of numbers, write a Python program to find the sum of all the elements in the list.

You can also use map:

a = [1, 1, 1, 1, 1] b = 1 list(map(lambda x: x + b, a))

It gives:

[2, 2, 2, 2, 2]

**Python,** Learn about range, slice, append and len in Python . Start from in python. It is similar to the array of most languages. in python. So, to access any element of a list, we write name_of_list[index]. range(1,10,2) will create a sequence of numbers but with a step of 2. It means To find sum of the elements in a list. Python 2 Python Program to find Sum of Elements in a List. This python program allows user to enter the length of a List. Next, we used Python For Loop to add numbers to the list. TIP: Python sum function returns the sum of all the elements in a List

If you don't want list comprehensions:

a = [1,1,1,1,1] b = [] for i in a: b.append(i+1)

**List in Python : lists, range, slice, append, len, etc in Python,** Python numpy sum() function is used to get the sum of array elements over a given axis. NumPy Array to List · 4. 1 Python numpy sum() function syntax; 2 Python numpy sum() Examples. 2.1 1. Sum of All the Elements in the Array; 2.2 2. If we specify the axis value, the sum of elements along that axis is returned. To find the sum of all the elements in a list. Approach : Read input number asking for length of the list using input() or raw_input(). Initialise an empty list lst = []. Read each number using a

try this. (I modified the example on the purpose of making it non trivial)

import operator import numpy as np n=10 a = list(range(n)) a1 = [1]*len(a) an = np.array(a)

`operator.add`

is almost more than two times faster

%timeit map(operator.add, a, a1)

than adding with numpy

%timeit an+1

**numpy.sum() in Python,** In this tutorial we will see how to sum up all the elements of an array. Program 1: No user interaction /** * @author: BeginnersBook.com * @description: 30, 40, 50, 10}; int sum = 0; //Advanced for loop for( int num : array) { sum = sum+num to use more than one for each loop in one prog having different different array list? To get the sum of all elements in a numpy array, you can use Numpy’s built-in function sum (). The syntax of numpy.sum () is shown below. numpy.sum(a, axis=None, dtype=None, out=None, keepdims=<no value>, initial=<no value>)

**Java program to sum the elements of an array,** In this program, we need to calculate the sum of all the elements of an array. This can be solved by looping through the array and add the value of the element in To find the sum of all the elements in a list. Approach : Read input number asking for the length of the list using input() or raw_input(). Initialize an empty list lst = []. Read each number using a for loop. In the for loop append each number to the list. Now we use a predefined function sum() to find the sum of all the elements in a list.

**Python program to print the sum of all elements in an array,** This loop traverses the list and updates each element. len returns the number of The sum() function only works when the list elements are numbers. In this example, Python only created one string object, and both a and b refer to it. Answers: If are you working with numbers a lot, you might want to take a look at NumPy. It lets you perform all kinds of operation directly on numerical arrays. For example: >>> import numpy >>> array = numpy.array ( [49, 51, 53, 56]) >>> array - 13 array ( [36, 38, 40, 43]) Questions:

**Lists,** import numpy as np x = np.array([[0,1],[2,3]]) print("Original array:") print(x) print("Sum of all elements:") print(np.sum(x)) print("Sum of each Given an integer array and we have to find the sum of all elements in Python. Finding the sum of array elements There are two ways to find the sum of all array elements, 1) traverse/access each element and add the elements in a variable sum, and finally, print the sum. And, 2) find the sum of array elements using sum() function.