Detect keypress in Python in a simple way?

[PolarBear123]

Hey guys,
I have been online for such a long time now and I really can't seem to find a working option. My plan is to run a program on BrickPi3 using Python which is very simple - move the robot forward when pressing 'w', stop it when 's' is pressed. I'm new to BrickPi3 and this is just to test. I know this isn't the BrickPi forum, but the problem is about Python and actually doesn't have anything to do with Python. So this is my program:

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import brickpi3
from time import sleep
import keyboard

BP = brickpi3.BrickPi3()

speed = 50

while True:
    if keyboard.is_pressed('w'):
        BP.set_motor_power(BP.PORT_B + BP.PORT_C, speed)
        if keyboard.is_pressed('s'):
            BP.set_motor_power(BP.PORT_B + BP.PORT_C, 0)

My problem is that the keyboard module isn't working. I've installed it using

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sudo pip3 install keyboard

, but when I run the program, it tells me I need root. So I try running the program over the terminal, and when I move into the directory and type

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sudo python motor_test.py

, it tells me something about 'no module named keyboard'. Is there a way to detect keypress using the keyboard module or another simple way as I would not prefer to use something like curses as it does make everything much more complicated.
Thank you very much!

[joelostinspace]

are you running it in python2.7???
try:

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sudo python3 motor_test.py

show complete error output

[rpiMike]

Why are you using sudo - shouldn't need it.

I would probably use the pygame library to detect key presses.

[PolarBear123]

are you running it in python2.7???
try:

Code: Select all

sudo python3 motor_test.py

show complete error output

No, I'm using Python 3.

[PolarBear123]

Why are you using sudo - shouldn't need it.

I would probably use the Pygame library to detect key presses.

Ok. How would that translate into the original code I posted above?
Thank you.

[rpiMike]

Something like the following:

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import pygame
pygame.init()
screen = pygame.display.set_mode((400,400))

done = False
while not done:
    
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            done = True
        elif event.type == pygame.KEYDOWN:
            if event.key == pygame.K_w:
                print("pressed w")
            if event.key == pygame.K_s:
                print("pressed s")
            

The downside is you need a pygame window - but i'm usually displaying something.

[PolarBear123]

Ok. Thank you very much!