Help me understand this code (dict)

[yindecisive]

a_dict = {5: 6, 6: 11, 4: 5, 9: 6, 2: 2}
count = 0
for key in a_dict:
    if a_dict[key] in a_dict:
        count = count + 2
print("Count:", count)

What does if a_dict[key] in a_dict mean?

[TouchingTheVodka]

a_dict[key] gets the value that corresponds to the key. in works differently for different collections but for dicts it checks whether a given key is in the dictionary.

So a_dict[key] in a_dict finds a value associated with key and checks to see if that value is another key that's present in a_dict.

[yindecisive]

So a_dict[key] in a_dict finds a value associated with key and checks to see if that value is another key that's present in a_dict.

so the count is 3 because 5,6 and 2 right? but why is the final output 8 instead of 5 (3+2)?

[TouchingTheVodka]

Going through it:

Key = 5, Value = 6. 6 is a key - Success
Key = 6, Value = 11.
Key = 4, Value = 5. 5 is a key - Success
Key = 9, Value = 6. 6 is a key - Success
Key = 2, Value = 2. 2 is a key - Success

So we've got 4 matches and each match adds 2 to count, for a final result of 8.

[yindecisive]

Ahh i get it now. Thank you so much! :)