有必要在python中调用文件处理程序的flush方法吗

io open flush close

close

with open('dump.txt', 'w') as f:
    while True:
        buf = read_off_some_thingy()
        f.write(buf.decode())
        time.sleep(5)

cat dump.txt

with open('dump.txt', 'w') as f:
    while True:
        buf = read_off_some_thingy()
        f.write(buf.decode())
        f.flush()
        time.sleep(5)

with

fsync

.close()

.write(); .flush();