Add two arrays without using for. Python

Question

I have these two arrays:

import numpy as np
a = np.array([0, 10, 20])
b = np.array([20, 30, 40, 50])  

I´d like to add both in the followin

Answer 1

First you need to specify the array type, if you use a constructor like that. For instance for integers, use that:

a = array("i",[0, 10, 20])       # signed int type
b = array("i",[20, 30, 40, 50]) 

Them you might want to use while loops with counters, it is more complex than for, but avoids the for loop.

from array import array

a = array("i",[0, 10, 20])  # signed int

b = array("i",[20, 30, 40, 50]) 

c = array("i",[])

count1 = 0

while count1 < len(a):
   count2 = 0
   while count2 < len(b):
       c.append(a[count1]+b[count2])
       count2 += 1
   count1 += 1

print(c)