It is normal to run log.py first and then follow.py (it can have an effect similar to tail -f), but it is not possible to run follow.py first and then log.py, and it is done through vi access-log It is not possible to add the class content at the end because flush does not write \0, and readline does not read \0 continue or not? What is the specific underlying cause of this problem?

# log.py
 
f = open("access-log","w")

import time, random
while True:
    time.sleep(random.random())
    n = random.randint(0,len(ips)-1)
    m = random.randint(0,len(docs)-1)
    t = time.time()
    date = time.strftime("[%d/%b/%Y:%H:%M:%S -0600]",time.localtime(t))
    print >>f,"%s - - %s %s" % (ips[n],date,docs[m])
    f.flush()

# follow.py

import time
def follow(thefile):
    thefile.seek(0,2)      # Go to the end of the file
    while True:
         line = thefile.readline()
         if not line:
             time.sleep(0.1)    # Sleep briefly
             continue
         yield line

# Example use
if __name__ == '__main__':
    logfile = open("access-log")
    for line in follow(logfile):
        print line,