Python 3 non-blocking read with pySerial (Cannot get pySerial's “in_waiting” property to work)

Question

For the life of me, I cannot figure out how to do a non-blocking serial read in Python 3 using my Raspberry Pi.

Here\'s my code:

import serial #for          


        

Answer 1

The documentation link you listed shows in_waiting as a property added in PySerial 3.0. Most likely you're using PySerial < 3.0 so you'll have to call the inWaiting() function.

You can check the version of PySerial as follows:

import serial
print serial.VERSION

If you installed PySerial using pip, you should be able to perform an upgrade (admin privileges may be required):

pip install --upgrade pyserial

Otherwise, change your code to use the proper interface from PySerial < 3.0:

while (True):
    if (ser.inWaiting() > 0):
        ser.read(ser.inWaiting())