Why Does The Input In The Array Overwrites The Values Of Each Row

i have this piece of code x=3 a=x*[x*[0]] for i in range(0,x): for j in range(0,x): dt=int(input('insert data: ')) a[i][j]=dt print(a) and it's supposed t

Solution 1:

you just created 3 rows with the same reference with a=x*[x*[0]]. x*[0] is built once, and propagated on all rows by the outer multiply operator.

Changing a row changes all the rows. Note that it can be useful (but not there obviously)

Do that instead (using a list comprehension):

a=[x*[0] for _ in range(x)]

so references of each row are separated