使用python排序fasta序列的顺序

def sort_fasta_sequences(fasta_file):
    sequences = {}
    current_sequence = ""
    
    with open(fasta_file, 'r') as file:
        for line in file:
            line = line.strip()
            if line.startswith(">"):
                if current_sequence:
                    sequences[current_sequence_id] = current_sequence
                current_sequence_id = line[1:]
                current_sequence = ""
            else:
                current_sequence += line
    
    if current_sequence:
        sequences[current_sequence_id] = current_sequence
    
    sorted_sequences = sorted(sequences.items(), key=lambda x: x[0])
    
    for sequence_id, sequence in sorted_sequences:
        print(">" + sequence_id)
        print(sequence)

fasta_file = "example.fasta"
sort_fasta_sequences(fasta_file)