CS50P PSET3: Why is my code failing check50 for the grocery problem?

Question

The problem set I am trying to solve: CS50P 2022 psets/3/grocery/

The code I wrote:

# Syntax of dict = {'key': value}
mydict = {}

# Infinite loop with break
while True:
    try:
        item = input().upper()
        # Search if item matches a key inside the dict
        if item in mydict:
            mydict[item] = mydict[item] + 1
        else:
            mydict[item] = 1
    except EOFError:
        for i in mydict:
            print(mydict[i], i)
        break

The check50 results:

Results for cs50/problems/2022/python/grocery generated by check50 v3.3.7
:) grocery.py exists
:) input of EOF halts program
:) input of "apple" and "banana" yields "1 APPLE 1 BANANA"
:) input of "strawberry" and "strawberry" yields "2 STRAWBERRY"
:) input of "mango", "sugar", and "mango" yields "2 MANGO 1 SUGAR"
:( input of "tortilla" and "sweet potato" yields "1 SWEET POTATO 1 TORTILLA"
    expected "1 SWEET POTATO...", not "\n\n1 TORTILLA..."

As you can see above, check50 is failing:

:( input of "tortilla" and "sweet potato" yields "1 SWEET POTATO 1 TORTILLA"
    expected "1 SWEET POTATO...", not "\n\n1 TORTILLA..."

But when I run python grocery.py the result seems to match the expected outcome:

tortilla
sweet potato
1 TORTILLA
1 SWEET POTATO

I am having trouble understanding where I made the mistake. Please help.

Answer 1

My mistake was that the dict wasn't ordered properly. I solved that by importing OrderedDict method from collections class. Here's the code I added in the except statement:

from collections import OrderedDict

...

while True:
    try:
        ...
    except EOFError:
        # https://docs.python.org/3/library/collections.html#collections.OrderedDict 
        mydict = OrderedDict(sorted(mydict.items(), key=lambda t: t[0]))
        ...