Two dimensional lists
Two dimensional list is a list having all the all its elements as lists of same shapes, ie; Two dimensional list is a lists of lists
for example: L1 = [ [1,2] , [9,8] , [5,6] ]
Creating a 2D list
To create a 2D list by inputting element by element, you can employ a nested loop as shown in the program below: Ballupur rose and other for reading individual elements of each row.
Ques: Program to create a 2D list ?
Lst = []
r = int(input("How many rows ?"))
c = int(input("How many columns ?"))
for i in range(r):
row = []
for j in range (c):
elem = int(input("Element"+str(i)+","+str(j)+":"))
row.append(elem)
Lst.append(row)
print("List created is: ",Lst)
Traversing a 2D list
To traverse 2D list element by element can employ a nested loop as earlier: one loop for row and another loop for traversing individual elements of each row.
Ques : Program to traverse a 2D list ?
Lst = []
r = int(input("How many rows ?"))
c = int(input("How many columns ?"))
for i in range(r):
row = []
for j in range (c):
elem = int(input("Element"+str(i)+","+str(j)+":"))
row.append(elem)
Lst.append(row)
print("List created is: ")
print("Lst = [ ")
for a in range(r):
print("\t[",end ="")
for b in range(c):
print(Lst[a][b],end=" ")
print("]")
print("\t]")
Changing individual element in a 2D list
You can access individual elements in a 2D list by specifying its indexes in a square brackets.e.g., To access the 3rd row’s 3rd element from the 2D list namely Lst that we created in the previous session you will write:
