Controls computer keyboard through pyserial

Question

I don't know how to use regular expression in a pile of code and I'm not sure how to code it correctly either. I tried to lookup for tutorial, guides, everything. But I'm still not understand about it, so please help me to fix my stupid code.

Summary of the working, I'm trying to code a small program that controls my computer keyboard through pyserial and with the help of microbit. For example, when button A is pressed, the microbit sends data to my computer through uart and my python shell at the end receiving the message, try to match it and execute the respective command.

This is the code of microbit

from microbit import *

uart.init(baudrate=57600, bits=8, parity=None, stop=1, tx=None, rx=None)
while True:
    if button_a.is_pressed():
        uart.write("Up")
        display.show(Image.ARROW_NW)
    if button_b.is_pressed():
        uart.write("Down")
        display.show(Image.ARROW_S)
    else:
        display.show(Image.ASLEEP)

This is the code of my python end

import re
import serial
import keyboard

serialPort = serial.Serial(port = "COM5", baudrate=57600,
                           bytesize=8, timeout=2, stopbits=serial.STOPBITS_ONE)

serialString = ""

while(1):

    (serialPort.in_waiting > 0)

    serialString = serialPort.readline()

    wordsa = ("up")
    wordsb = ("down")

    if():
        words = [word.lower() for word in wordsa if re.match('^[a-zA-Z]+', word)]
        keyboard.press_and_release('up')

The problem is I want to have re to match the string or data received from microbit through uart at serialString = serial.Port.readline(), if the microbit sends UP, I would want python to match the data received is UP or Down, then press the keyboard key UP or DOWN respectively. Upon running this shitty code of mine, there are no errors showing up and it won't work at all. I think this is a very stupid question to ask, but please help me. This problem has burned a hole at my brain already.

Think if(): is actually if (): which is the same as if []:, so always returns false so never gets into the other code. — DarrylG
– DarrylG, Commented Jan 26, 2020 at 4:39
Since the serialString has the message shouldn't you have: if serialString =="Up": keyboard.press_and_release('up'), since the Microbit sends "Up". Don't understand why you need a regular expression to check for "Up" vs "Down". — DarrylG
– DarrylG, Commented Jan 26, 2020 at 4:46
Since newline character included in readlines we can add it in our check for "Up" with: if serialString == "Up\n": keyboard.press_and_release('up') — DarrylG
– DarrylG, Commented Jan 26, 2020 at 5:11

Just some sailboat · Accepted Answer · 2020-01-27 11:29:32Z

1

Thank you and Kudos to DarryIG, Profile Link. He saved my days

If any beginners like me just wanting to do a match-up on a string. You don't need to use regular expression. You can do it with operator == while = is assignment.

For example:

Game = ['Dota2', 'LoL']; #Games that you play
Like = ['Dota2', 'LoL']; #Games that your friend likes

if Game == Like:
    print ('True')
else:
    print ('False')

Output : True

Note: I know my answer sucks, but I just wanna keep this question answered just in case someone like me will need this information. Thanks for understanding.

answered Jan 27, 2020 at 11:29

Just some sailboat

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Controls computer keyboard through pyserial

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Thank you and Kudos to DarryIG, Profile Link. He saved my days

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