可以将DNA序列转换为二进制代码的函数

def dna_to_binary(dna_sequence):
    # 映射字典
    mapping = {'A': '00', 'T': '01', 'C': '10', 'G': '11'}
    
    # 转换为二进制代码
    binary_sequence = ''.join(mapping[nucleotide] for nucleotide in dna_sequence)
    
    return binary_sequence

# 示例使用
dna_seq = "ATCG"
binary_seq = dna_to_binary(dna_seq)
print(binary_seq)  # 输出: 00011011

def validate_dna_sequence(dna_sequence):
    valid_nucleotides = set('ATCG')
    if not all(nucleotide in valid_nucleotides for nucleotide in dna_sequence):
        raise ValueError("Invalid DNA sequence")

# 示例使用
dna_seq = "ATCG"
validate_dna_sequence(dna_seq)  # 不会抛出异常
dna_seq = "ATCX"  # 包含无效核苷酸
validate_dna_sequence(dna_seq)  # 抛出 ValueError