Never take your tippy typers off the home row again! ASDFJKL; are now mod keys! Hold 'em down then press spacebar.

8bitKeyboard.py

# 8 mod keys and one real key.
# Minimalist typing scheme.
# Never move your hands off the home row.

# Requires https://pypi.python.org/pypi/keyboard/

# EXAMPLE : 
# For the letter 'A', the binary is 0100 0001
# Hold down 's' and semicolon, and then press Space.

import keyboard

keysdown = {
    'a' : False,
    's' : False,
    'd' : False,
    'f' : False,
    'j' : False,
    'k' : False,
    'l' : False,
    ';' : False,
}

def currentEntry():
    n = 0
    for i, x in enumerate(";lkjfdsa"):
        if keysdown[x]:
            n += 2**i
    return chr(n)

def keyInput(event):
    if event.name in "asdfjkl;":
        keysdown[event.name] = event.event_type == "down"

    elif event.event_type == "down" and event.name == "space":
        keyboard.write(currentEntry())

keyboard.hook(keyInput, True)

Use Python 3.7 by the way.