def get_seq_len_list_from_dic(seqs_dic):
    """
    Given a dictinary with sequences, return a list of sequence lengths.

    >>> seqs_dic = {'seq1':'ACGT', 'seq2': 'ACGTACGT'}
    >>> get_seq_len_list_from_dic(seqs_dic)
    [4, 8]

    """
    assert seqs_dic, "sequences dictionary seqs_dic empty"
    len_list = []
    for seq_id in seqs_dic:
        len_list.append(len(seqs_dic[seq_id]))
    assert len_list, "sequence lengths list len_list empty"
    return len_list