Using python, using loops, don\'t use built-in functions. Consider the following

Question

Using python, using loops, don't use built-in functions.

Consider the following Python statement. integers: twoD 01, 2, 3], [7, 8, 9 a. Write an assignment statement that replaces the value of 6 in this 2-D list with a value of 12. b. Write a code fragment that uses a loop to print the values in the leftmost column of the 2-D list to which twoD refers. Print each value on its own line. For the list above, the following values would be printed 4 7 Your code should be general enough to work on any two-dimensional list named twoD that has at least one value in each row c. Write a code fragment that uses one or more loops to print the values in the anti- diagonal of the list to which twoD refers .e., the values along a diagonal line from the bottom-left corner to the upper-right corner. Print each value on its own line. For the list above, the following values would be printed: 7 Your code should be general enough to work on any two-dimensional list in which the dimensions are equal .e., the number of rows is the same as the number of columns Hint: To determine the necessary pattern, make a table showing the row and column indices of each element in the anti-diagonal. What is true about each pair of indices?

Explanation / Answer

(A)

twoD[1][2] = 12

(B)

twoD = [ [1, 2, 3 ] , [ 4, 5, 6 ], [ 7, 8, 9 ] ]

# traverse the rows

for i in range( 0, len(twoD) ):

    print(twoD[i][0])

Sample Output

1

4

7

(C)

twoD = [ [1, 2, 3 ] , [ 4, 5, 6 ], [ 7, 8, 9 ] ]

# traverse the rows

for i in range(len(twoD) - 1, -1, -1 ):

   

    for j in range(0, len(twoD[i])):

   

        if i == len(twoD[i]) - j - 1:

       

            print(twoD[i][j])

Sample Output

7

5

3

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