Given a value, create a temporary file and make this file available for the duration of the context.

tmp_file_value_context.py

class ValueContext(object):
    """
    A ValueContext is constructed from a value that can be writtent to a file
    and then exposes the value as a temporary file in its context.

    The temporary file path can be accessed using its `name` attribute.

    For example:

    >>> with ValueContext("hello") as tmpfile:
    ...     print(tmpfile.read())
    ...     print(tmpfile.name)
    hello
    /tmp/XXXXXXXXX
    """
    def __init__(self, value: str):
        self.value = value

    def __enter__(self):
        self.file = tempfile.NamedTemporaryFile("w")
        self.file.write(self.value)
        self.file.flush()
        os.fsync(self.file)
        os.chmod(self.file.name, 0o600)
        return self.file

    def __exit__(self, *args):
        self.file.close()