python将pkcs8的私钥转换为pkcs1

场景是与支付宝对接，手里只有java sdk使用的pkcs8的私钥，但需要使用python sdk开发一些工具，私钥不兼容，所以需要进行转换。

from cryptography.hazmat.primitives import serialization
from cryptography.hazmat.primitives.asymmetric import rsa

    private_key_base64 = '[pkcs8私钥]'
    private_key_bytes = base64.b64decode(private_key_base64)
    private_key_pem = f"-----BEGIN PRIVATE KEY-----\n{base64.b64encode(private_key_bytes).decode('utf-8')}\n-----END PRIVATE KEY-----"
    private_key = serialization.load_pem_private_key(
        private_key_pem.encode('utf-8'),
        password=None
    )
    private_key_pkcs1_pem = private_key.private_bytes(
        encoding=serialization.Encoding.PEM,
        format=serialization.PrivateFormat.TraditionalOpenSSL,
        encryption_algorithm=serialization.NoEncryption()
    )

    print(private_key_pkcs1_pem.decode('utf-8'))