why 17 ?

Question

primes = {1: 2, 2: 3, 4: 7, 7:17}
print(primes[primes[4]])

why that give to me in output 17 ?

Answer 1

Mitch I think you did not know the concept of python dictionaries. It is collection of unordered items which can be accessed using their keys.
It's syntax looks like this :-
Name = {key:value , key:value}

When you write primes[4] it means you want to access element with key 4 which is third element of the dictionary (i.e. 7)
Similarly primes[7] is the last element's key.

Thus the result is 17.

To learn more about dictionary go here👇
https://www.w3schools.com/python/python_dictionaries.asp

Answer 2

Primes[4] = 7
Primes[7] = 17
So primes[primes[4]] = primes [7] = 17.

Answer 3

primes[4] is 7
primes[7] is 17

Answer 4

Arsenic, I didn’t really understand what you wrote, set the process, please.

Answer 5

thank you Arsenic, i understand better now