Editing a txt document using python

[duckredbeard]

I have a program that monitors a DHT11 temperature sensor and logs the data to a txt document. The program loops every 3 minutes, so it gets a new line quite often. I'd like to have it purge out the old stuff, maybe delete the first line and add a new last line. Another option I would consider is to bulk delete several lines every hour, using a different program if necessary.

import Adafruit_DHT
import time
from gpiozero import LED
import requests
from datetime import datetime

DHT_SENSOR1 = Adafruit_DHT.DHT11
DHT_PIN1 = 14
LED1 = LED(21)  #Pulses as long as program is running
LED2 = LED(16)  #Amber on light

LED2.on()
with open("/home/pi/LittleFridgeLog.txt", "a") as file:
    results = "Monitor service restarted" + "\n"
    file.write(results)

#r = requests.post("https://bit.ly/EDITEDFORPRIVACY")  #Message that service has started
r = requests.post("https://joinjoaomgcd.appspot.com/_ah/api/messaging/v1/sendPush?deviceId=group.android&text=LFTempMonitorStart&apikey=EDITEDFORPRIVACY")
while True:    
    humidity1, temperature1 = Adafruit_DHT.read_retry(DHT_SENSOR1, DHT_PIN1)  #Little fridge
    LittleFridgeF = (temperature1 * 9/5) + 32
    LittleFridgeF = round(LittleFridgeF,2)
    now = datetime.now()
    current_time = now.strftime("%H:%M:%S")
    
    # Log time and temp to text file
    with open("/home/pi/LittleFridgeLog.txt", "a") as file:
        results = current_time + " Little Fridge:" + str(LittleFridgeF) + "\n"
        file.write(results)
    
    if LittleFridgeF < 40:  #Less than this temp is good.  Blue light on.
        print(current_time)
        print("Little Fridge:", LittleFridgeF)
        print("")
        LED1.blink(.05,5)

    else:
        LED1.blink(.3,.3)
        print(current_time)
        print("Little Fridge overtemp:", LittleFridgeF)
        print("")
        alert = "overtemplittlefridge " + str(LittleFridgeF)
        base = "autoremotejoaomgcd.appspot.com/sendmessage?key=EDITEDFORPRIVACY&message="
        alerturl = "https://"+base+alert
        r = requests.post(alerturl)
    
        
    time.sleep(180)
time.sleep(1)

Can this be done?