Assign value to an individual cell in a two dimensional python array [duplicate]

Answer 1

The answer is simple Never use

q = [[None]*5]*4

as when you do assignment

q[0][1]=5 it assigns value multiple time to multiple rows at 1 column try print(q)

rather use

q = { (i,j):0 for i in range(5) for j in range(4) }

then q[0][1]=5 will assign one time only try

print(q)