Pycryptodome进行RSA签名，读取文件内的私钥和公钥出错

To generate the .PEM file this code was used.

random_generator = Random.new().read
rsakey = RSA.generate(1024, random_generator)
f=open(email+'.pem','wb')
f.write(rsakey.exportKey("PEM"))
f.write(rsakey.publickey().exportKey("PEM"))
f.close()

This is what the contents of a .PEM file is like.