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key = input("enter key")
try:
    key = ord(key)
except ValueError:
    print("wrong key pressed")

Error:
enter key
Traceback (most recent call last):
  File "/home/vivek/Documents/prac.py", line 3, in <module>
    key = ord(key)
TypeError: ord() expected a character, but string of length 0 found

key = input("enter key")
try:
    key = ord(key)
    print(key)
except (ValueError, TypeError):
    print("wrong key pressed")