import rsa
key = rsa.newkeys(3000)#生成随机秘钥
privateKey = key[1]#私钥
publicKey = key[0]#公钥
message ='sanxi Now is better than never.'
print('Before encrypted:',message)
message = message.encode()
cryptedMessage = rsa.encrypt(message, publicKey)
print('After encrypted:\n',cryptedMessage)
message = rsa.decrypt(cryptedMessage, privateKey)
message = message.decode()
print('After decrypted:',message)

Before encrypted: sanxi Now is better than never.
After encrypted:
 b"P\xaa\xfb\x13\x0c\xbd\x92\x9cn\x98\xab\xe0C\xa8B\x08\xbbQ\x83w\x93*\xeai\x8d\xecxeb\xb2+\x8d\x01\xa5\xdeO\xc2\x87\x81\x19\xf9\x96\x14h\xf6\xa2\x14.Q>K\x92\xcdd\xa4xb0\xee!+\xea\xb7)\x8f\xa5iN\xedY%#\xcdE\xae\xc1#\x9d\xb2\xd9\xe4C)|\xc2[$\xb1\x04\xc1|
a\x99B\xbf\x0c\x95\x85\x96A\x99f_\xfa(\x0f\x00\x9av\x07\x82\xcb\x8b\x8b\xd9\xfe\xd23\xb9
\x8a\x0b\x17\x89\x9d\x88\xc4"
After decrypted: sanxi Now is better than never.