Python how to check if input is a letter or character

Question

How can I check if input is a letter or character in Python?

Input should be amount of numbers user wants to check. Then program should check if input given by user be

Answer 1

You can check the type of the input in a manner like this:

num = eval(input("Number to check:"))
if isinstance(num, int):
    if num < 0:
        print(num+"\tFAIL. Number is minus")
    elif tribonnaci(num) == num: # it would be clean if this function also checks for the initial correct answers. 
        print(num + '\tYES')
    else:
        print(num + '\NO')
else:
    print('FAIL, give number')

and if not an int was given it is wrong so you can state that the input is wrong. You could do the same for your initial n = int(input("How many numbers do you want to check:")) call, this will fail if it cannot evaluate to an int successfully and crash your program.