Getting Exception: Object type <class 'str'> cannot be passed to C code

Question

I install pip install pycryptodome on Python 3.7.2. I'm getting above exception for obj = AES.new(key, AES.MODE_CBC, iv) line. my code is:

from Crypto import Random
from Crypto.Cipher import AES
import random

def get_encryption():
    try:
        str = "This is input string"

        key = b'abcdefghijklmnop'  
        iv = Random.new().read(AES.block_size)

        obj = AES.new(key, AES.MODE_CBC, iv)
        encrypted = obj.encrypt(str)
        print(encrypted)
    except Exception as e:
        print(e)

I tried to all the way but not getting how to solve it.

Answer 1

After tried all the way I got solution. I converted key string into bytes. code is:

from Crypto import Random
from Crypto.Cipher import AES
import random

def get_encryption():
    try:
        strmsg = "This is input string"

        key = 'abcdefghijklmnop'  
        key1 = str.encode(key)

        iv = Random.new().read(AES.block_size)

        obj = AES.new(key1, AES.MODE_CBC, iv)
        encrypted = obj.encrypt(str.encode(strmsg))
        print(encrypted)
    except Exception as e:
        print(e)