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Imagine you’re a DevOps engineer and you are responsible to grant access to the database, which could be known as Database Administrator as well.

However, it’s a new year and your company management decided to promote some of the potential team members to become the team leaders. 🎉🎉🎉

As you all known:

With great responsibility comes great power. — Mark Manson

The management informs you to update their database privileges as they previously offered **read-only** access to the database. If you’re interested in how to create a read-only role for MongoDB, please read the post here. The management has asked you to grant them to write access too to all the databases since they’re the team leader now.

Let’s call them, “ **devA**” and “ **devB**”. In the next section, we would show the step-by-step guide on how to grant the read & write access to both users.

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Given two user input matrix. Our task is to display the addition of two matrix. In these problem we use nested List comprehensive.

matrix multiplication in python user input

Step1: input two matrix.

Step 2: nested for loops to iterate through each row and each column.

Step 3: take one resultant matrix which is initially contains all 0. Then we multiply each row elements of first matrix with each elements of second matrix, then add all multiplied value. That is the value of resultant matrix.

```
# Program to multiply two matrices
A=[]
n=int(input("Enter N for N x N matrix: "))
print("Enter the element ::>")
for i in range(n):
row=[] #temporary list to store the row
for j in range(n):
row.append(int(input())) #add the input to row list
A.append(row) #add the row to the list
print(A)
# [[1, 2, 3], [4, 5, 6], [7, 8, 9]]
#Display the 2D array
print("Display Array In Matrix Form")
for i in range(n):
for j in range(n):
print(A[i][j], end=" ")
print() #new line
B=[]
n=int(input("Enter N for N x N matrix : ")) #3 here
#use list for storing 2D array
#get the user input and store it in list (here IN : 1 to 9)
print("Enter the element ::>")
for i in range (n):
row=[] #temporary list to store the row
for j in range(n):
row.append(int(input())) #add the input to row list
B.append(row) #add the row to the list
print(B)
# [[1, 2, 3], [4, 5, 6], [7, 8, 9]]
#Display the 2D array
print("Display Array In Matrix Form")
for i in range(n):
for j in range(n):
print(B[i][j], end=" ")
print()
result = [[0,0,0], [0,0,0], [0,0,0]]
for i in range(len(A)):
for j in range(len(B[0])):
for k in range(len(B)):
result[i][j] += A[i][k] * B[k][j]
print("The Resultant Matrix Is ::>")
for r in result:
print(r)
```

```
Enter N for N x N matrix: 3
Enter the element ::>
2
1
4
2
1
2
3
4
3
[[2, 1, 4], [2, 1, 2], [3, 4, 3]]
Display Array In Matrix Form
2 1 4
2 1 2
3 4 3
Enter N for N x N matrix : 3
Enter the element ::>
1
2
3
4
5
6
7
8
9
[[1, 2, 3], [4, 5, 6], [7, 8, 9]]
Display Array In Matrix Form
1 2 3
4 5 6
7 8 9
The Resultant Matrix Is ::>
[34, 41, 48]
[20, 25, 30]
[40, 50, 60]
```

https://www.pakainfo.com/python-program-multiplication-of-two-matrix-from-user-input/

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