Python脚本在启动时执行时不写入文件

Question

I am trying to make a python loop script that will write to a file.

When I execute the script in terminal, the file gets written with no issue.

I wan't this script to start on boot, so I put it in the rc.local file. The script runs, however it is not writing the output to the specified file..

I did some reading on flushing and un-buffered output.. Could anyone help me out or point me in the right direction?

When this script is finished it will send the file using REST, but I need the file to write before I even get there..

The script:

#!/usr/bin/python -u

while True:
    try:
        print "This is only a test..."
        with open("loop.txt", "a") as loopFile:
            loopFile.write("This is only a test...")
            loopFile.write('\n')
            loopFile.flush()
            loopFile.close()
        time.sleep(1)
    except KeyboardInterrupt:
        break
        quit()

The /etc/rc.local file:

/usr/bin/python /home/pi/loop.py &

loop.py and loop.txt both have read/write/execute access.

Answer 1

Add a full pathname to the statement opening the file:

#!/usr/bin/python -u

while True:
    try:
        print "This is only a test..."
        with open("/home/users/sj091190/loop.txt", "a") as loopFile:
            loopFile.write("This is only a test...")
            loopFile.write('\n')
            loopFile.flush()
        time.sleep(1)
    except KeyboardInterrupt:
        break
        quit()