python - flush 和 readline 細節
先運行log.py 再運行follow.py 正常（可以有類似tail -f 的效果），但是先運行follow.py 再運行log.py 不可以，而且過通過vi 在access-log 最後加入類別容，也不可以，是因為flush 不寫\0，readline 讀到\0 就不繼續嗎？這個問題具體底層是什麼原因？
# 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,