Identifying and Correcting Errors (Unit 1.4)

Become familiar with types of errors and strategies to fixing them

Lightly Review Videos and take notes on topics with Blog

Complete assigned MCQ questions

Here are some code segments you can practice fixing:

alphabet = "abcdefghijklmnopqrstuvwxyz"

alphabetList = []

for i in alphabet:
    alphabetList.append(i)

print(alphabetList)

['a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z']

The intended outcome is to determine where the letter is in the alphabet using a while loop

What is a good test case to check the current outcome? Why?
Make changes to get the intended outcome.

letter = input("What letter would you like to check?")

i = 0

while i < 26:
    if alphabetList[i] == letter:
        print("The letter " + letter + " is the " + str(i+1) + " letter in the alphabet")
    i += 1

The letter a is the 1 letter in the alphabet

The intended outcome is to determine where the letter is in the alphabet using a for loop

What is a good test case to check the current outcome? Why?
Make changes to get the intended outcome.

letter = input("What letter would you like to check?")
count = 0
for i in alphabetList:
    if i == letter:
        print("The letter " + letter + " is the " + str(count+1) + " letter in the alphabet")
    count += 1

The letter a is the 1 letter in the alphabet

This code outputs the even numbers from 0 - 10 using a while loop.

Analyze this code to determine what can be changed to get the outcome to be odd numbers. (Code block below)

evens = []
i = 0

while i <= 10:
    evens.append(i)
    i += 2

print(evens)

[0, 2, 4, 6, 8, 10]

This code should output the odd numbers from 0 - 10 using a while loop.

odds = []
i = 0

while i <= 9:
    odds.append(i+1)
    i += 2

print(odds)

[1, 3, 5, 7, 9]

This code outputs the even numbers from 0 - 10 using a for loop.

Analyze this code to determine what can be changed to get the outcome to be odd numbers. (Code block below)

numbers = [0,1,2,3,4,5,6,7,8,9,10]
evens = []

for i in numbers:
    if (numbers[i] % 2 == 0):
        evens.append(numbers[i])

print(evens)

[0, 2, 4, 6, 8, 10]

This code should output the odd numbers from 0 - 10 using a for loop.

numbers = [0,1,2,3,4,5,6,7,8,9,10]
odds = []

for i in numbers:
    if (numbers[i] % 2 == 1):
        odds.append(numbers[i])

print(odds)

[1, 3, 5, 7, 9]

The intended outcome is printing a number between 1 and 100 once, if it is a multiple of 2 or 5

What values are outputted incorrectly. Why?
Make changes to get the intended outcome.

numbers = []
newNumbers = []
i = 0

while i < 100:
    numbers.append(i)
    i += 1

for i in numbers:
    if numbers[i] % 5 == 0:
        newNumbers.append(numbers[i])
    if numbers[i] % 2 == 1:
        newNumbers.append(numbers[i])

print(newNumbers)

[0, 1, 3, 5, 5, 7, 9, 10, 11, 13, 15, 15, 17, 19, 20, 21, 23, 25, 25, 27, 29, 30, 31, 33, 35, 35, 37, 39, 40, 41, 43, 45, 45, 47, 49, 50, 51, 53, 55, 55, 57, 59, 60, 61, 63, 65, 65, 67, 69, 70, 71, 73, 75, 75, 77, 79, 80, 81, 83, 85, 85, 87, 89, 90, 91, 93, 95, 95, 97, 99]

Challenge

This code segment is at a very early stage of implementation.

What are some ways to (user) error proof this code?
The code should be able to calculate the cost of the meal of the user

Hint:

write a “single” test describing an expectation of the program of the program
test - input burger, expect output of burger price
run the test, which should fail because the program lacks that feature
write “just enough” code, the simplest possible, to make the test pass

Then repeat this process until you get program working like you want it to work.

menu =  {"tacos": 9.99,
         "fries": 5.99,
         "drink": 4.99}
print (menu)

order= input("Hi, What would you like to eat? >>")

if order == "tacos":
    print("you ordered tacos, your total is $5.99")
elif order == "fries":
    print("you ordered fries, your total is $9.99")
elif order == "drink":
    print("you ordered a drink, your total is $4.99")
elif order != "tacos" or "fries" or "drink":
    print("That item is not on the menu, try re-order")

{'tacos': 9.99, 'fries': 5.99, 'drink': 4.99}
you ordered tacos, your total is $5.99

Hacks

What errors may arise in your project?
- Some error that may arise in our project is dictionary errors, api errors, and syntax errors. When they input a letter it may not be read correctly and place the letter in the wrong spot or it may not say that a correct letter is included in a word.
What are some test cases that can be used?
- We can test inputting some correct letters and some wrong letters. This will lead to our desired output. If we type in a wrong letter a body part will appear.
Make sure to document any bugs you encounter and how you solved the problem.
- I will document any errors I have and inform my team.
What are “single” tests that you will perform on your project? Or, your part of the project?
- I will first play the game for myself and then I will ask peers to review the game aswell.