mailbox.py 文件源码

def set_flags(self, flags):
        """Set the given flags and unset all others."""
        flags = set(flags)
        status_flags, xstatus_flags = '', ''
        for flag in ('R', 'O'):
            if flag in flags:
                status_flags += flag
                flags.remove(flag)
        for flag in ('D', 'F', 'A'):
            if flag in flags:
                xstatus_flags += flag
                flags.remove(flag)
        xstatus_flags += ''.join(sorted(flags))
        try:
            self.replace_header('Status', status_flags)
        except KeyError:
            self.add_header('Status', status_flags)
        try:
            self.replace_header('X-Status', xstatus_flags)
        except KeyError:
            self.add_header('X-Status', xstatus_flags)