imap4.py 文件源码

def messageFile(self, octets):
        """Create a file to which an incoming message may be written.

        @type octets: C{int}
        @param octets: The number of octets which will be written to the file

        @rtype: Any object which implements C{write(string)} and
        C{seek(int, int)}
        @return: A file-like object
        """
        if octets > self._memoryFileLimit:
            return tempfile.TemporaryFile()
        else:
            return StringIO.StringIO()