How to multiply two list in python.

Question

I tried to multiply two lists by * operator but in gives error. Also plz tell me the answers to the following question
a = [1, 2, 3]
b=[4, 5, 6]
c= a*b
d=c[0:3]
e=d
a[5]=10
c[1]=20
e[0] = 30
What will be the output of following statements?
(i) print(e)
(ii) print(a)
(iii) print(d)
(iv) print(c)

Answer 1

Multiplying of lists is not supported in Python.

Also when you multiply 2 lists what do you do to them? Do you treat them like matrices or do you just multiply corresponding terms?

Answer 2

You can use numpy library and function multiply:

import numpy as np
a = [[2, 2], [2, 2]]
b = [[1, 2], [3, 4]]
print(np.multiply(a, b)) # [[2, 4], [6, 8]]

Answer 3

a=[[1,0,0],[0,1,0],[0,0,1]]
b=[[1,2,3],[4,5,6],[7,8,9]]
C=[ ]
for i in range(3):
C.append([ ])
for j in range(3):
C[i].append(0)
for x in range(3):
C[i] [j] +=a[i][x]*b[j][x]
print(C)

Answer 4

c = list(zip(a, b))
d = []
for i in range(len(c)):
d.append(c[i][0] * c[i][1]

Answer 5

Prometheus I just want to multiply each corresponding term.

Answer 6

To multiply two lists of similar or different size, you can use the zip() function with list comprehension.

Here is the code:

a = [1, 2, 3, 4]
b = [5, 6, 7, 8]

result = [num1*num2 for num1, num2 in zip(a,b)]

print('Multiplication result is: ', result)

This will take care of list multiplication irrespective of the size of the lists.
Here is the full article...

https://programmersportal.com/how-to-multiply-two-lists-in-JUMP_LINK__&&__python__&&__JUMP_LINK