Discussion on: Solving the Problem Sets of CS50's Introduction to Programming with Python — One at a Time: Problem Set 3

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Replies for: Now Im nearly done with the taqueria, but it gives me 1 error... saying input of burger leads to reprompt and is expected to reject the structure ...

Nevermind... I actually fixed it... was due to the except statements... I was putting both errors under one except statement and check50 expects different behaviours for each error...so i just separated by having 2 except statements, one with pass and other with break

Eda • May 3 '22

I have just seen your comment, glad you fixed it! I've also come across timeout errors with the new problem set, I guess it happens when try...except block or a loop is suffocated with many things at once and cannot exit the program properly.

Andre Castro • May 4 '22

Now, I'm nearly done with the grocery problem, but I just need to for example, if i input Apple Orange at the same time to print in separate lines...It prints in separate lines if I type Apple then enter, Orange then enter... but if I type Apple Orange then enter prints one next to the other...

Eda • May 4 '22

Not sure if I understand it correctly, but shouldn't you enter each item separately anyway? Like the example I give in this article, Accio, Lumos, etc. all inputted one by one. So if you put two items as one input, it is going to be stored as such.

Andre Castro • May 4 '22 • Edited

If i input one by one my code works correctly although I only get 2 green checks that the file exists and the one handling the EO error... the other errors are all the same:

:( input of "apple" and "banana" yields "1 APPLE 1 BANANA"
expected "1 APPLE\n1 BAN...", not "Input: 1 APPLE..."
:( input of "strawberry" and "strawberry" yields "2 STRAWBERRY"
expected "2 STRAWBERRY", not "Input: 1 STRAW..."
:( input of "mango", "sugar", and "mango" yields "2 MANGO 1 SUGAR"
expected "2 MANGO\n1 SUG...", not "Input: 1 MANGO..."
:( input of "tortilla" and "sweet potato" yields "1 SWEET POTATO 1 TORTILLA"
expected "1 SWEET POTATO...", not "Input: 1 TORTI..."

below is a example of my logic...

dictionary = {} 

while True:
     user_input = input("Input: ")

     dictionary[user_input] = dictionary.get(user_input, 0) + 1

     for key, value in sorted(dictionary.items()):
          print(f"{value} {key.upper()}", end=" ")
          print("\n")

Eda • May 5 '22

I implemented it with the same logic as well. But, you need to wrap everything inside a try...except block. Like, you can try to get the input and put it inside the dictionary; and only inside except EOFError you can do the for loop and printing. Also, I don't think you need to specify end inside the first print function and then print a newline. Just print(f"{value} {key.upper()})" will be going to provide a new line after each time by default, so you do not need to do anything else.

Andre Castro • May 5 '22

Ye I have everything wrapped inside try...except block, just didnt include that in the code I wrote here...

Andre Castro • May 5 '22 • Edited

Amazing! I fixed it! Thanks a lot for the tip...I was around and around trying new ways and would never have guessed that the for loop should be inside the except. I even tried import sys and use sys.stdin.read().split("\n") and was working as expected, but couldn't get green checks, only yellow checks ...anyway, now looking through the code and thinking about the logic makes perfect sense...Thanks a lot! Onto the next one :)

Eda • May 5 '22

Congrats! We only need to print everything after the user hits control-d (resulting in EOFError), so it makes sense to put it inside the except. It's absolutely great to see that helped!