Exam 1

Question 1

What is wrong with the code snippet below?

print(Hello world)

Answer 1

Missing “ “ around Hello world

Question 2

True or False: Python automatically inserts a newline character when you use the print command

Answer 2

True

Question 3

Single line comment

Answer 3

#

Question 4

Multiple line comment

Answer 4

’’’

Question 5

What does the print statement do?

Answer 5

Sends your output to the screen

Question 6

Which statement will print Hi! without a newline character?

Answer 6

print(“Hi!” , end= ‘ ‘)

Question 7

How many arguments are in each of the following calls to the print function?

print(end= ‘ ‘)
print()
print(“Hi”,”there”)
print(“Hi there”)
print(“The quick brown fox” , “jumps” , “over the lazy” , “dog”, end= ‘\n’)

Answer 7

10215

Question 8

True or False: the two names below refer to the same variable

My_Variable
my_variable

Answer 8

False

Question 9

Declare the variable my_variable and assign it the value of “red” and assign another variable to overwrite this with “blue”

Answer 9

my_variable = “red”
my_variable = “blue”

Question 10

What is the rule regarding boolean values in Python?

Answer 10

Boolean values in Python are case sensitive. They must start with a capital letter.

Question 11

Strings

Answer 11

Collections of letters, numbers, and symbols

Question 12

Boolean

Answer 12

True or False

Question 13

Ints

Answer 13

Integers (no decimals)

Question 14

Floats

Answer 14

Numbers with a decimal

Question 15

Select the ways that a string can be declared

my_string = “I am a string”
my_string = “I am a string’
my_string = ‘“I am a string”’
my_string = ‘I am a string’

Answer 15

my_string = “I am a string”
my_string = ‘“I am a string”’
my_string = ‘I am a string’

Question 16

What are the rules for variable names in Python?

Answer 16

You cannot use a keyword

The variable name must start with a letter or an underscore

The rest of the variable name can only be letters, numbers, or an underscore

Question 17

Declare a variable my_boolean and assign it the boolean value of true. Print the variable

Answer 17

my_boolean = True
print(my_boolean)

Question 18

Use two print statements to write the following string:
Okay, it is time to learn about operators

Answer 18

print(“Okay, “, end= ‘ ‘)
print(“it is time to learn about operators.”)

Question 19

What happens when you add an int and a float?

Answer 19

You get a float

Question 20

Select the line of code below that increments the variable by 1

Answer 20

a = a +1

Question 21

In the following line of code, what value is stored in variable b when the program ends?

a = 5
b = 3
c = a + b
a = 2
b = c

Answer 21

8

Question 22

True or False: The / operator sometimes returns an integer

Answer 22

False

Question 23

True or False: The // operator always returns a whole number value

Answer 23

True

Question 24

What does modulo do?

Answer 24

Returns the remainder after division is performed

Question 25

Which operation should be performed first in the following expression? 7 / 2 + (5 % 2 * 5) ** 2 - 3

Answer 25

5 % 2

Question 26

Which operators can be used with strings?

Answer 26

* and +

Question 27

Which data type is used by a conditional to know which part of the code should be executed?

Answer 27

Boolean

Question 28

Why might you want to use a compound conditional?

Answer 28

Compound conditionals allow you to test two or more things to be true, and they can make your code more concise and easy to read

Question 29

Why might you NOT want to use a compound conditional?

Answer 29

When you have conditions that depend on the outcome of other conditions and with several variables, constructing a single boolean expression that is correct is difficult and hard to read and understand.

Question 30

Create a compound conditional that prints Hello World. Assume the variable color has already been declared and has the value red

Answer 30

A compound conditional requires two boolean expressions joined by either and or or. if color == 'red' or color == 'pink': print("Hello World")

Question 31

What is the purpose of the random.seed() function

Answer 31

To set up a predictable sequence of pseudo-random numbers

Question 32

What is the main difference between a loop and a conditional?

Answer 32

A loop repeats the block of code as long as its condition is true

Question 33

In the following code, identify the loop control variable, the looping condition, and the update to the loop control. n = int(input("Enter a number: ")) sum = 0 while n > 0: sum = sum + n n = n - 1 print("The sum of the first n numbers is", sum)

Answer 33

n n > 0 n = n - 1

Question 34

What will cause an infinite loop?

Answer 34

Not updating the loop control variable in the body of the loop

Question 35

How many times is the following while loop going to check it’s condition? i = 0 while i <= 5: print (i+1) i = i + 1

Answer 35

7

Question 36

What is the difference between a definite loop and an indefinite loop?

Answer 36

A definite loop will execute a predictable number of times while an indefinite loop will execute an unpredictable number of times which depends on circumstances.

Question 37

What purpose does a break statement have on a loop?

Answer 37

A break statement is used to exit a loop