How to obtain the keycodes in Python

Question

I have to know what key is pressed, but not need the code of the Character, i want to know when someone press the 'A' key even if the key obtained is 'a' or 'A', and so with all other keys.

I can't use PyGame or any other library (including Tkinter). Only Python Standard Library. And this have to be done in a terminal, not a graphical interface.

NOT NEED THE CHARACTER CODE. I NEED TO KNOW THE KEY CODE.

Ex:

ord('a') != ord('A')                      # 97 != 65
someFunction('a') == someFunction('A')    # a_code == A_code

Answer 1

The obvious answer:

someFunction = string.upper

ord('a') != ord('A')                      # 97 != 65
someFunction('a') == someFunction('A')    # a_code == A_code

or, in other (key)words:

char_from_user = getch().upper() # read a char converting to uppercase
if char == 'Q':
    # quit
    exit = True # or something
elif char in ['A', 'K']:
    do_something()

etc...

Here is a implementation of the getch function, that would work in both Windows and Linux platforms, based on this recipe:

class _Getch(object):
    """Gets a single character from standard input.  
       Does not echo to the screen."""
    def __init__(self):
        try:
            self.impl = _GetchWindows()
        except ImportError:
            self.impl = _GetchUnix()

    def __call__(self): 
        return self.impl()

class _GetchUnix(object):
    def __init__(self):
        import tty, sys

    def __call__(self):
        import sys, tty, termios
        fd = sys.stdin.fileno()
        old_settings = termios.tcgetattr(fd)
        try:
            tty.setraw(sys.stdin.fileno())
            ch = sys.stdin.read(1)
        finally:
            termios.tcsetattr(fd, termios.TCSADRAIN, old_settings)
        return ch


class _GetchWindows(object):
    def __init__(self):
        import msvcrt

    def __call__(self):
        import msvcrt
        return msvcrt.getch()


getch = _Getch()