Detect keystrokes in python (tty)

import sys
import termios
import tty

#Get standard input file descriptor
fd = sys.stdin.fileno()

#Get the terminal attributes of fd
old = termios.tcgetattr(fd)

try:
    #Switch standard input mode
    #Both cbreak and raw don't need enter, but raw is ctrl-c can't be heard??
    tty.setcbreak(sys.stdin.fileno())
    #tty.setraw(sys.stdin.fileno())
    ch = sys.stdin.read(1)
    
finally:
    #Restore the attributes of fd
    termios.tcsetattr(fd, termios.TCSANOW, old)

print(ch)

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