How can I put only positive number in "input"? If someone puts negetive number values ,It will show error.

Question

AGE is always positive number

Answer 1

You can also you if-else condition.
If user enters a negative age then says that try again.

# here is some code
if age <= 0:
print("Wrong input. Try again")
else:
# continue with your code here

Answer 2

use catch exeption

Answer 3

You can try the absolute function: abs(-16) // return 16