如何在BioPython中解决HTTP429错误？

import time
from Bio import Entrez

def fetch_data():
    Entrez.email = 'your_email@example.com'
    # 设置请求间隔时间为1秒
    time.sleep(1)
    try:
        handle = Entrez.efetch(db='pubmed', id='12345678', rettype='fasta', retmode='text')
        # 处理返回的数据
        data = handle.read()
        handle.close()
        return data
    except Exception as e:
        if '429' in str(e):
            # 发生HTTP 429错误，进行重试
            retries = 3
            for i in range(retries):
                print(f'Retrying... Attempt {i+1}/{retries}')
                time.sleep(1)
                try:
                    handle = Entrez.efetch(db='pubmed', id='12345678', rettype='fasta', retmode='text')
                    # 处理返回的数据
                    data = handle.read()
                    handle.close()
                    return data
                except Exception as e:
                    print(f'Error: {str(e)}')
        else:
            print(f'Error: {str(e)}')

# 调用fetch_data函数来获取数据
result = fetch_data()
print(result)