but when you return 0 or other number python will return that's number not a boolean value ?

that's a method not a function

when you use if nums

python check if the list at least have one element and return true

if list is empty python return false so automatically the if block is not excuted

range(1,7)

the last number (stop=7) is not included in the range function so when you write 7 the iteration of the for loop will stop in the number 6 (since the 7 is not included)
so when you want to stop in 7 you should do 7+1

god damn, man give me your brain