Objects and Data Structure Assessment Test

Question 1

Numbers

Answer 1

There are various number type in Python e.g integers which are just whole numbers like 1 or 2, and floating point numbers which have a decimal point 2.4 or 1.0. Exponentials like squares and square roots come under floating point numbers

Question 2

Strings

Answer 2

Strings are a record of text information and are constructed using double or single quotes

Question 3

Lists

Answer 3

lists are a collection of items constructed using brackets [] and commas that seperate every element.

Question 4

Tuples

Answer 4

Tuples are like lists however, unlike lists tuples are immutable meaning they cannot be added to or changed. Tuples can be used for day or months on a calendar

Question 5

Write an equation that uses multiplication, division, an exponent, addition, and subtraction that is equal to 100.25

Answer 5

100.25 = 1.25 + (5**2*8/2) - 1

Question 6

What is the value of the expression 4 * (6 + 5)

Answer 6

44

Question 7

What is the value of the expression 4 * 6 + 5

Answer 7

29

Question 8

What is the value of the expression 4 + 6 * 5

Answer 8

34

Question 9

What is the type of the result of an expression 3 + 1.5 + 4?

Answer 9

Floating point number

Question 10

What would you use to find a number’s square root, as well as it’s square?

Answer 10

Square root: 100 ** 0.5 = 10.0
Square: 10 ** 2 = 100

Question 11

s = ‘hello’
# Print out the e string using indexing

Answer 11

s[1]
‘e’

Question 12

s = ‘hello’
# Reverse the string using slicing

Answer 12

s[::-1]

Question 13

s = ‘hello’
# Print out the ‘o’
Method 1:
Method 2:

Answer 13

Method 1: s[4]
Method 2: s[-1]

Question 14

Build this list [0,0,0] two seperate ways.
Method 1:
Method 2:

Answer 14

Method 1: [0]*3
Method 2:
list1 = [0,0,0]
list1

Question 15

Reassign ‘hello’ in this nested list to say ‘goodbye’ instead.
list3 = [1,2,[3,4,’hello’]]

Answer 15

list3[2][2] = ‘goodbye’
list3 = [1,2,[3,4,’hello’]]

Question 16

Sort the list in two methods:
list4 = [5,3,4,6,1]

Answer 16

Method 1: .sorted(list4)
Method 2:
list4.sort()
list4

Question 17

1. Grab ‘hello’ using indexing and slicing.
   d = {‘simple_key’ : ‘hello’}

Answer 17

d[‘simple_key]

Question 18

4. Grab ‘hello’ using indexing and slicing.
   d = {‘k1: [1,2,{‘k2’ :[‘this is tricky’,{‘tough’ :[1,2,[‘hello’]]}]}]}

Answer 18

d’[k1’][2][‘k2’][-1][‘tough’][2]

Question 19

2. Grab ‘hello’ using indexing and slicing.
   d = {‘k1’: {‘k2’ : ‘hello’}}

Answer 19

d[‘k1’][‘k2’]

Question 20

3. d = {‘k1’ :[{‘nest_key’ :[‘this is deep’, [‘hello’]]}]}

Answer 20

d[‘k1’][0][‘nest_key’][-1]

Question 21

Can you sort a dictionary? Why or why not?

Answer 21

No, because normal dictionaries are mappings not a sequence

Question 22

How do you create a tuple?

Answer 22

t = (1,2,3)

Question 23

What is the major difference between tuples and lists

Answer 23

Tuples, unlike lists are immutable which means they cannot be added to or changed

Question 24

What’s unique about a set?

Answer 24

Sets are unique because they don’t allow for duplicate items

Question 25

Use a set to find the unique values of the list below:
list5 = [1,2,2,33,4,4,11,22,3,3,2]

Answer 25

set(list5)

Question 26

2 > 3

Answer 26

False

Question 27

3 <= 2

Answer 27

False

Question 28

3 == 2.0

Answer 28

False

Question 29

3.0 == 3

Answer 29

True

Question 30

4**0.5 !=2

Answer 30

False

Question 31

l_one = [1,2,[3,4]]
l_two = [1,2,{‘k1’ :4}]
-
True or False?
l_one[2][0] >= l_two[2][‘k1’]

Answer 31

False