Do Someone know the reason ot the code stays wrong? The error happens because the matrix's index

Question

https://code.sololearn.com/cVHV8SHd6C1N/?ref=app

Answer 1

Basically the code is trying to assign values at a list location that it doesn't have yet. For the same reason something like the following won't work
a = []
a[0] = 1

To add new entries, we use the list.append method. One way to fix your code is this:

for line in range(0, lines):
matrix.append([]) # adds a new row
for column in range(0, columns):
matrix[line].append(rand(0, 100))

Answer 2

You're welcome! :)

Answer 3

Thank you so much ✌✌