Reading serial data in realtime in Python

Question

I am using a script in Python to collect data from a PIC microcontroller via serial port at 2Mbps.

The PIC works with perfect timing at 2Mbps, also the FTDI usb-seri

Answer 1

From the manual:

Possible values for the parameter timeout: … x set timeout to x seconds

and

readlines(sizehint=None, eol='\n') Read a list of lines, until timeout. sizehint is ignored and only present for API compatibility with built-in File objects.

Note that this function only returns on a timeout.

So your readlines will return at most every 2 seconds. Use read() as Tim suggested.