Exercise 7-9 Solution Python Crash Course Chapter 7 : User Input And While Loops

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📘 Python Crash Course – Chapter 7: User Input And while loops – Exercise 7-9 Solution

Welcome to another solution from Python Crash Course by Eric Matthes.

📝 Exercise 7-9

Task:
Using the list sandwich_orders from Exercise 7-8, make sure the sandwich 'pastrami' appears in the list at least three times . Add code near the beginning of your program to print a message saying the deli has run out of pastrami, and then use a while loop to remove all occurrences of 'pastrami' from sandwich_orders . Make sure no pastrami sandwiches end up in finished_sandwiches .

✅ Solution Code:


sandwich_orders = ['tuna', 'chicken','pastrami', 'egg', 'ham', 'pastrami', 'pastrami']
finished_sandwiches = []
for sandwich in sandwich_orders:
    if sandwich == "pastrami":
        print("deli has run out of pastrami")
        
    else:
       print(f"I made your {sandwich} sandwich.")
       finished_sandwiches.append(sandwich) # add the sandwich to the finished list


while "pastrami" in sandwich_orders:
    sandwich_orders.remove("pastrami") # remove all occurrences of pastrami from sandwich_orders
   

print("-----------------------------------------------------------------")

for sandwich in finished_sandwiches:
    print(f"Your {sandwich} sandwich is ready.")

🧠 Code Explanation:

  1. Create a list of sandwich orders:

    The variable sandwich_orders is assigned a list containing various sandwich orders, including multiple occurrences of "pastrami".

  2. Create an empty list for finished sandwiches:

    The variable finished_sandwiches is initialized as an empty list. This list will store the sandwiches that have been successfully made.

  3. Process each sandwich order:

    A for loop iterates through the sandwich_orders list. For each sandwich:

    • If the sandwich is "pastrami", a message is displayed indicating that the deli has run out of pastrami.
    • For all other sandwiches, a message is displayed indicating that the sandwich has been made, and the sandwich is added to the finished_sandwiches list.
  4. Remove all occurrences of "pastrami":

    A while loop is used to remove all occurrences of "pastrami" from the sandwich_orders list. The loop continues until "pastrami" is no longer in the list.

  5. Display finished sandwiches:

    After processing all orders, a for loop iterates through the finished_sandwiches list. For each sandwich in the list, a message is displayed indicating that the sandwich is ready.

🔍 Output:


I made your tuna sandwich.
I made your chicken sandwich.
deli has run out of pastrami
I made your egg sandwich.
I made your ham sandwich.
deli has run out of pastrami
deli has run out of pastrami
-----------------------------------------------------------------
Your tuna sandwich is ready.
Your chicken sandwich is ready.
Your egg sandwich is ready.
Your ham sandwich is ready.

📚 Related Exercises from Chapter 7:

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