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How do I read data from a serial port? python

Hi please my main question as I am new to python.
I am trying to read data from a serial port. Basically a serial port is a USB port converted to a serial port practically. I am using arduino.
I tried this code first:

while(True):
    ser=serial.Serial('COM6',9600)
    bytoread=ser.inWaiting()
    val=ser.read(bytoread)

But it gave me an error.

Permission Error(13,Access is denied, none 5)

But when I changed my code to

while(True):
    ser=serial.Serial()
    ser.baudrate=19600
    ser.port='COM6'
    ser
    ser.open()
    bytoread=ser.inWaiting()
    val=ser.read(bytoread)

No permission error occurred, but the program is always busy connecting the port. I waited for many minutes, but he never moved forward. What am I doing wrong here?

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1 answer


you can do something like:

import serial
ser = serial.Serial('COM6', 9600, timeout=None)

while True:
    data = ser.readline()


you cannot put ser = serial.Serial('COM5', 9600, timeout=None)

in a loop while

because it will constantly (re) create the connection ...

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