How to apply key handling facilities in Python?

Question

Python

In IDLE command

>>> import msvcrt
>>> msvcrt.getch()

Displays immediately b'\xff'
What does b'\xff' mean (I did not press anything)
Code

from msvcrt import getch
while True:
    print(ord(getch()))

Goes into an endless loop. How to make sure you don't leave?
Code (in IDLE)

n = input()
print(n)

accepts only numbers. How to make letters accepted?

Answer 1

Keyboard .