Domain 3 - Recap

Question 1

1. Using curly braces, produce a print statement that uses string formatting to display the message “Hi I’m Bryce, I am 25 years old.
2. What benefit do the curly braces provide for string formatting?

Answer 1

1. The curly braces as you to mix strings and ints together without the need to cast values.

Question 2

1. Using the new format string method ‘f’, display the message “Hi I’m Bryce, I am 25 years old.

Answer 2

Question 3

1. In Python 2, strings were formatted using the following

%s

%d

Explain what types of variables can be used with each one.

Answer 3

1. %s was used as a placeholder for strings.
2. %d means ‘decimal’ but it can be a placeholder for numbers

Question 4

Refer to the floating point variable below

cost = 1000.1212

Using a print statement, how can this be formatted to two decimal places?

Answer 4

Question 5

Using the same variable again, explain what the output will be from this print statement.

cost = 1000.1212

print(“The cost of the product is %10f” %cost)

Answer 5

1. This means the output number will be ten digits long.

Question 6

What will be the output of the following print statement?

print(“Hello \tWorld \nUniverse”)

Answer 6

1. The escape character \t will insert a tab
2. The escape character \n will place the word “Universe” on a new line.

Question 7

Using the same example again, how would we print everything in the string including the escape characters?

print(“Hello \tWorld \nUniverse”)

Answer 7

1. Use ‘r’ to print a raw string.

print(r”Hello \tWorld \nUniverse”)

Question 8

What is the following code an example of?

s = ‘’’\
Hello
World
Universe’’’

print(s)

Answer 8

1. This is a multi line string
2. The backslash is used to escape the new line.

Question 9

Will a python script run if it encounters a syntax error?

Answer 9

No

Question 10

Numbers can be formatted using different systems. What do each of these letters represent?

1. b
2. c
3. d
4. o
5. x
6. X

Answer 10

1. b = binary
2. c = character
3. d = decimal
4. o = octal
5. x = hexadecimal lowercase
6. X = hexadecimal uppercase

Question 11

What will be the output of the following code sample?

num = 7000

formatted = “”
print(formatted.format(num))

Answer 11

1B58

Question 12

What will be the output of the following code sample?

num = 7000

formatted = “”
print(formatted.format(num))

Answer 12

1. 7,000

Note the inclusion of the comma in this line formatted = “”

Question 13

What symbols can be used to format text to do the following?

1. centered
2. right
3. left

Answer 13

1. ^ = centered
2. > = right aligned
3. < = left aligned

Question 14

What will be the output of the following formatted text?

num = 5000

num2 = 200

formatted = {1: *^15, d}

print(formatted.format(num, num2))

Answer 14

******200******

Note, 1 is equal to the index of num2

Question 15

If the user enters a value of 5 into this script, what will the print statement and the eval function display?

a = input(“Type some input “)

print (“input is {}, is type of {} “.format(a, type(a) ))

b = eval(a)

print(type (b))

Answer 15

1. input is 5, is type of
   2.