python - 刷新和 fsync 在临时文件中不起作用

Question

我正在尝试创建一个文件。在这个文件中，我将所有需要处理的文件放在一个脚本中，并将该文件作为参数传递。我的问题是有时列表的长度不足以填满缓冲区，并且没有任何内容写入磁盘。我尝试刷新和 fsync 临时文件，但没有任何反应。该脚本是第三方脚本，因此我无法更改参数的传递方式。

with tempfile.NamedTemporaryFile(bufsize=0) as list_file:
    list_file.write("\n".join(file_list) + "\n")
    list_file.flush()
    os.fsync(list_file)

    command = "python " + os.path.join(SCRIPT_PATH, SCRIPT_NAME) + " --thread --thread_file "
    ppss_command = [SCRIPT_PATH + "/ppss", "-f", list_file.name, "-c", command]
    p = subprocess.Popen(ppss_command)
    out,err = p.communicate()

最终解决方案代码(jterrace Answer):

with tempfile.NamedTemporaryFile(delete=False) as list_file:
     list_file.write("\n".join(file_list) + "\n")
     list_file.close()
     command = "python " + os.path.join(SCRIPT_PATH, SCRIPT_NAME) + " --thread --thread_file "
     ppss_command = [SCRIPT_PATH + "/ppss", "-f", list_file.name, "-c", command]
     p = subprocess.Popen(ppss_command)
     out, err = p.communicate()
     list_file.delete = True

Answer 1

来自NamedTemporaryFile docstring :

Whether the name can be used to open the file a second time, while the named temporary file is still open, varies across platforms (it can be so used on Unix; it cannot on Windows NT or later).

因此，当您仍然打开文件时，它可能无法从子进程中读取。这是我会做的:

fd, tmp_fpath = tempfile.mkstemp()
os.close(fd) # Needed on Windows if you want to access the file in another process

try:
    with open(tmp_fpath, "wb") as f:
        f.write("\n".join(file_list) + "\n")

    # ... subprocess stuff ...
    do_stuff_with(tmp_fpath)
finally:
    os.remove(tmp_fpath)