# Input numbers in nested list and check symmetric matrix or not in Python

###### Lists - Question 15

In this question, we will see how to input numbers in a 3X3 integer matrix (nested list) and check whether it is a symmetric matrix or not in Python programming. To know more about lists click on the lists lesson.

**Q15)** Write a program in Python to input numbers in a 3X3 integer matrix (nested list) and check whether it is a symmetric matrix or not. Symmetric matrix is such a matrix whose row elements are exactly same as column elements.

#### Program

```
a=[[],[],[]]
r=0;c=0;x=0;
print('Enter 9 numbers')
for r in range(3):
for c in range(3):
a[r].append(int(input()))
for r in range(3):
for c in range(3):
print(a[r][c],end=' ')
if a[r][c]==a[c][r]:
x=x+1
print()
if x==9:
print('Symmetric Matrix')
else:
print('Not Symmetric Matrix')
```

#### Output

Enter 9 numbers 2 4 5 4 9 12 5 12 15 2 4 5 4 9 12 5 12 15 Symmetric Matrix