Question

I’m writing to a text file using the code below. the setup is:

1. read ‘\n’-terminated data off of the serial port.
2. create a text file containing only one line of text.

_

import serial

ser = serial.Serial ( 2 , baudrate = 57600 , timeout = 1 )
AngleText = open ("data.txt" , "w")

while True:

    line = ser.readline().strip('^\n\r')
    print line
    AngleText.write (str(line))
    AngleText.flush()

ser.close()

The problem is, data gets appended to the text file. what I want is to have a text file containing only one line. How should I solve this? thanks!

Answer 1

One solution is to move the open and close statements inside the loop so that each time you get data you overwrite the file. For example:

import serial

ser = serial.Serial ( 2 , baudrate = 57600 , timeout = 1 )
while True:

    line = ser.readline().strip('^\n\r')
    print line
    AngleText = open ("data.txt" , "w")
    AngleText.write (str(line))
    AngleText.close()

ser.close()