CODEWITHSUNDEEP
python
user1586957
user1586957

Reputation: 147

Sum values from two lists using a function - no zip, map

I need solution to sum (addition) of each items of having same index. I find the solution using map, zip, list comprehension. Is there any solution defining function. My attempt:

a = [1,2,3]
b = [4,5,6]

def add(a,b):
    for x in a:
        return(x)
        def add1(x,b):
            for b in b:
                return x + b

print (add(a,b))

Output from above is 1 which is wrong

Expected output :[5,7,9]

Upvotes: 0

Views: 118

Answers (4)

NarutoUzumaki
NarutoUzumaki

Reputation: 11

You could use the code below to add if they have the same length

a = [1,2,3]
b = [4,5,6]
c=[]
def add_array(a,b):
    for i in range(len(a)):
        c.append(a[i]+b[i])
    return c
print(add_array(a,b))

Or you could convert them to numpy arrays and add

import numpy as np
a = [1,2,3]
b = [4,5,6]
def add_array(a,b):
    x=np.array(a)
    y=np.array(b)
    return x+y
print(add_array(a,b))

Upvotes: 0

Artier
Artier

Reputation: 1673

try this,

a = [1,2,3]
b = [4,5,6]
c=list()
for i in range(len(a)):
    c.append(a[i]+b[i])

Upvotes: 1

AGN Gazer
AGN Gazer

Reputation: 8378

Using numpy:

import numpy as np
c = np.add(a, b).tolist()

That is, you can define your function as:

def add(a, b):
    return np.add(a, b).tolist()

or,

add = lambda a, b: np.add(a, b).tolist()

Upvotes: 0

user3483203
user3483203

Reputation: 51165

a = [1,2,3]
b = [4,5,6]

def add(a, b):
    c = []
    for i in range(len(a)):
        c.append(a[i] + b[i])
    return c

print(add(a, b))

Output:

[5, 7, 9]

Upvotes: 1

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