passwd_gen = PasswordGenerator()

        #print 8-letter password containing only big and small letters

            of alphabet

    """

    ALPHABETS_NUM = r'''1234567890'''

    ALPHABETS_SMALL = r'''qwertyuiopasdfghjklzxcvbnm'''

    try:

        import chardet

        encoding = chardet.detect(unicode_)['encoding']

        if encoding is None:

            raise UnicodeEncodeError()

        elif prefix.strip() == '':

            raise VCSError("Prefix cannot be empty")

        archival.archive(self.repository._repo, stream, self.raw_id,

                         kind, prefix=prefix, subrepos=subrepos)

        if stream.closed and hasattr(stream, 'name'):

            stream = open(stream.name, 'rb')

        elif hasattr(stream, 'mode') and 'r' not in stream.mode:

    try:

        import chardet

        encoding = chardet.detect(unicode_)['encoding']

        if encoding is None:

            raise UnicodeEncodeError()

        for perm in user_repo_group_perms_from_users_groups:

            g_k = perm.UsersGroupRepoGroupToPerm.group.group_name

            p = perm.Permission.permission_name

            cur_perm = user.permissions[GK][g_k]

            # overwrite permission only if it's greater than permission