Unit 9 2D Lists Practice

Row-major order is when the row is listed first and then the column. Column-major order means the column is listed first and then the row. Which is more commonly used?

• row-major order

• column-major order

• neither. they both sound dumb.

• col-major order because column-major order is too much to type

Consider the following 2D list called "a":

3 4 5

8 9 1

2 7 6

Which element is referenced by a[1][2]?

• 9

• 4

• 1

• 8

Fill in the blank to add 4 lists of [1, 2, 3] as elements to the list called "a":

for i in range(4):

a.______([1, 2, 3])

Consider this code. What are the dimensions of the 2D list called "grid" (row x column)?

• 4 X 20

• 5 x 5

• 5 X 4

• 4 x 5

Consider this code. What is printed?

• 48

• 82

• 15

• 24

After running this code, how many rows are in "list"?

• 2

• 3

• 4

• 1

If I wanted to add 100 to every element of a 2D list of integers, I would use 2 nested traditional for loops

• true

• false

After this code is run, what values does the 2D list "a" hold?

• 0 1 2

  1 2 3

  2 3 4

• tuliprose

  daisygardenia

  dahliairis

• 0 0 0

  0 1 2

  0 2 4

• tulipaster

  daisylily

  dahliahyacinth

Select the best choice below to insert in the blanks to correctly swap two values at indexes [2][1] and [3][0] in the 2D list "a":

____ = a[2][1]

a[2][1] = a[3][0]

a[3][0] = ____

• temp

• a[0][0]

• a[i][j]

• a[][]

What type of variable can be accessed anywhere in the code?

• constant

• parameter

• global

• function