Big Idea 1 'Identifying and Correcting Errors'
Practice with identifying and correcting code blocks
alphabet = "abcdefghijklmnopqrstuvwxyz"
alphabetList = []
for i in alphabet:
alphabetList.append(i)
print(alphabetList)
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) + " letter in the alphabet")
i += 1
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?")
for i in alphabetList:
count = 0
if i == letter:
print("The letter " + letter + " is the " + str(count) + " letter in the alphabet")
count += 1
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)
This code should output the odd numbers from 0 - 10 using a while loop.
odds = []
i = 0
while i <= 10:
odds.append(i)
i += 2
print(odds)
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)
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 == 0):
odds.append(numbers[i])
print(odds)
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 == 0:
newNumbers.append(numbers[i])
print(newNumbers)
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 = {"burger": 3.99, #This is the Menu
"fries": 1.99,
"drink": 0.99}
total = 0 # Makes the starting amount 0
orders = []
print("Menu")
for k,v in menu.items():
print(k + " $" + str(v)) # Code that prints the Menu
Name = input("What is your name?") # Asks your name
print("Hello " + Name + "!")
order = input("What do you want today?") # Asks what you would like today
while order != "checkout": # Makes sure you dont want to checkout
if order == "burger": # Code for yif you want a
total += 3.99
orders.append("burger")
order = input("What else do you want today? Type 'checkout' to exit.")
print("burger added")
elif order == "fries": # Code for yif you want fries
total += 1.99
orders.append("fries")
order = input("What else do you want today? Type 'checkout' to exit.")
print("fries added")
elif order == "drink": # Code for yif you want a drink
total += 0.99
orders.append("drink")
order = input("What else do you want today? Type 'checkout' to exit.")
print("drink added")
if order == "checkout": # Checkout code
print("Here is everything that you ordered: " , orders)
print("Your total for this meal is $" , round(total,2))
Hacks
Now is a good time to think about Testing of your teams final project...
- What errors may arise in your project?
- Some errors that may occur during the development of the project could be syntax errors and incorrectly formatting code. These mistakes are very easy to fix but extremely hard to notice. They can cause a lot of problems and make a program not function as intended. Another error that may occur is writing a program in the incorrect language. I've written so many programs incorrectly because I created it in the wrong language. This is another easy to fix but annoying issue that may come up.
- What are some test cases that can be used?
- Some test cases that could be used as words that are used in multiple languages because they could be spelt the same way but have different meanings. Another test case that could be used is words that are very long and have a lot of characters. They could break the program simply by being too long for the program to understand.
- Make sure to document any bugs you encounter and how you solved the problem.
- What are “single” tests that you will perform on your project? Or, your part of the project?
- As Hack Design and Test plan action … Divide these “single” tests into Issues for Scrum Board prior to coding. FYI, related tests could be in same Issue by using markdown checkboxes to separate tests.