[英]Python subprocess executed script wont write to file
I have written two scripts where one script calls subprocess.Popen to run a terminal command to execute the second script. 我编写了两个脚本,其中一个脚本调用subprocess.Popen运行终端命令以执行第二个脚本。 After waiting 5 seconds, it will terminate the subprocess. 等待5秒钟后,它将终止子进程。
In the subprocess, I have a while loop polling a register and writing the contents of that register to a file. 在子过程中,我有一个while循环轮询一个寄存器,并将该寄存器的内容写入文件。
The method I am using is 我正在使用的方法是
f = open(filename, 'w')
...
while 1:
*poll register*
f.write(fp0)
sleep(1)
Whenever I run the script with the while loop stand alone, it writes the contents of the register to the file. 每当我单独运行while循环运行脚本时,它会将寄存器的内容写入文件。 However, when i execute the main script and execute the polling script as a subprocess, it does not write to the file after it terminates. 但是,当我执行主脚本并将轮询脚本作为子进程执行时,终止后它不会写入文件。
Can anyone provide any suggestions to the problem? 任何人都可以对这个问题提供任何建议吗?
Use a context on the opening of the file, and add a flush right before you sleep: 在打开文件时使用上下文,并在睡眠之前添加刷新:
with open(filename, 'w') as f:
...
while 1:
*poll register*
f.write(fp0)
f.flush()
sleep(1)
Since you are terminating the sub-process maybe it is not flushing the output to the file. 由于您要终止子流程,因此它可能没有将输出刷新到文件中。 Try calling f.flush()
to make sure the output is written to file. 尝试调用f.flush()
以确保将输出写入文件。
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