python的cryptograph生成一个公钥和私钥

可以使用以下代码来生成公钥和私钥：

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

# 生成私钥
private_key = rsa.generate_private_key(
    public_exponent=65537,
    key_size=2048
)

# 生成公钥
public_key = private_key.public_key()

# 将私钥和公钥序列化，以便保存到文件或传输
private_key_bytes = private_key.private_bytes(
    encoding=serialization.Encoding.PEM,
    format=serialization.PrivateFormat.PKCS8,
    encryption_algorithm=serialization.NoEncryption()
)

public_key_bytes = public_key.public_bytes(
    encoding=serialization.Encoding.PEM,
    format=serialization.PublicFormat.SubjectPublicKeyInfo
)

# 将私钥和公钥保存到文件
with open('private_key.pem', 'wb') as f:
    f.write(private_key_bytes)

with open('public_key.pem', 'wb') as f:
    f.write(public_key_bytes)

注意：在实际使用中，私钥应该妥善保管，不要随意泄露。