Quiz 3

Points Possible: 100

Date: Thursday, November 7th

Background

This quiz is based on the topics covered in weeks 8 through 10. There are 3 sections — short answer questions, Python statements, and a programming problem. Students are allowed to use the Thonny IDE for Section III only. Please see the grading rubric for the programming problem. Scratch paper and a simple calculator are allowed.

Submission

• Submit a quiz3.txt file on Blackboard with your answers.
• Submit any Python code from the Thonny IDE on Blackboard.

Section I (20 points)

1. How many times will the following loop run?

lst = [10, 21, 78, -9, -8]

for x in lst:
    if x < 0:
        break

• A. 2
• B. 3
• C. 4
• D. 5

2. Given:

def main():
    x = 12
    lst = [12, 21, 2]
    lst = func(x, lst)
    print("Value at index 0 is", lst[0])
    print("Value at index 1 is", lst[1])

def func(num1, number_list):
    num1 = 10
    number_list[0] = num1
    number_list[1] = num1 * 2
    return number_list

main()

What will be the output?

• A.

  Value at index 0 is 12
  Value at index 1 is 21
  

• B.

  Value at index 0 is 10
  Value at index 1 is 100
  

• C.

  Value at index 0 is 10
  Value at index 1 is 20
  

• D.

  Value at index 0 is 10
  Value at index 1 is 12
  

3. What will be the result of the following code?

my_list = [1, 2, 3, 4, 5]
print(my_list[2:4])

• A. [1, 2]
• B. [2, 3, 4]
• C. [3, 4]
• D. [3, 4, 5]

4. What is the output of the following code?

my_dict = {"a": 1, "b": 2}
my_dict["c"] = my_dict["a"] + my_dict["b"]
print(my_dict)

• A. {“a”: 1, “b”: 2, “c”: 3}
• B. {“a”: 1, “b”: 2, “c”: 2}
• C. {“a”: 1, “b”: 2}
• D. {“a”: 1, “b”: 2, “c”: “ab”}

5. What will the following code output?

my_list = [10, 20, 30, 40, 50]
print(len(my_list))

• A. 5
• B. 4
• C. 50
• D. 10

6. Which of the following lines of code will raise an error?

• A.

  my_list = [1, 2, 3, 4]; 
  my_list[2] = "Hello"
  

• B.

  my_list = [1, 2, 3, 4]; 
  my_list.append(5)
  

• C.

  my_dict = {1: "a", 2: "b"}; 
  my_dict[3] = "c"
  

• D.

  my_dict = {"name": "Alice"}; 
  print(my_dict[1])
  

7. What will be the output of the following code?

my_list = [1, 2, 3]
my_list[1] = 4
print(my_list)

• A. [1, 2, 3]
• B. [4, 2, 3]
• C. [1, 4, 3]
• D. [1, 2, 4]

8. Which method would you use to get a list of all values in a dictionary?

• A. dict.keys()
• B. dict.values()
• C. dict.items()
• D. dict.get()

9. Write an expression that will correctly update the value of “age” to 26 in the dictionary.

person = {"name": "John", "age": 25, "city": "New York"}

10. Write an expression to add a new key-value pair “country”: “USA” to the dictionary person.

person = {"name": "John", "age": 30, "city": "New York"}

Section II (40 points)

Given the following dictionary and list:

d = {"Alona":100, "Bob":78, "Charlie":89, "Eva":55, "John":66}
lst = [12, 32, 33, 5, 7, 8]

Write Python statements to do the following:

• a. Update the dictionary by adding a new item with key as “Jack” and value as 90.

• b. Write a for loop to print the keys and values in dictionary.

• c. Print value corresponding to the key “John”

• d. Update the value corresponding to “Eva” to 60.

• e. Print the average of numbers in lst.

• f. Get the index location of 5 in lst.

• g. Create a list of values in dictionary d.

• h. Find the sum of values in dictionary d.

Section III (40 points)

Programming question:

• You can use the Thonny Python IDE for writing the program.

Write a program that prompts users to enter a sequence of 5 numbers separated by spaces. If the sequence length is not 5, display an appropriate message and exit. Otherwise, create and print a dictionary containing the count of positive and negative numbers.

Sample run:

Enter 5 numbers separated by spaces: 12 2 -11 -3 3
{'Positive': 2, 'Negative': 3}

• Save your program as numbers.py and attach it to Blackboard.

Grading Rubric for Section III: