"""The following code can be run after commenting sleep, otherwise the file will always be empty"""

import time

file=open("data.txt","a+")
flag=0
while True:
    time.sleep(0.00001)
    if flag%2==0:
        flag=False
        file.write("test111+\n")
        print("add over")
    else:
        flag=True
        file.write("test222+\n")
        print("add over2")
    flag+=1