More Types Dictionary Functions section, quiz one three

Question

Why I get this error whenever I change the value of primes[4] to a number such as 3 or 2. It works with numbers 1 and 4 though. I don't know why? Just confused.
primes = {1: 2, 2: 3, 4: 7, 7:17}
print(primes[primes[3]])
I get this error:
"Traceback (most recent call last):
File "C:/Users/Python/SoloLearn/sololearn3.py", line 2, in <module>
print(primes[primes[3]])
KeyError: 3"
Thanks

Answer 1

You only have the following keys in your dictionary: 1, 2, 4 and 7. As you can see 🔑 Key 3 is non existent.

Answer 2

could it be that there is no key for the number 3?