How to write an RSA decoder?

Question

Python

Hello, I wanted to try to write a function that encrypts a file .... But not without errors :( There is a main.py file, it contains the following:

import rsa
( public, private ) = rsa.newkeys(512)
name = input("Enter filename: ")

file = open(name, "rb")
r = file.read() #считываю данные,что бы зашифровать
file.close()

crypt = rsa.encrypt(r, public )

file = open(name, "wb")
file.write(crypt)
file.close()

file = open("public.txt", "w")
file.write(str(public))
file.close()

file = open("private.txt", "w")
file.write(str(private))
file.close()

The file was successfully encrypted, but how to write a decryptor? Given that the keys are stored in separate files.
I tried to write it myself, here is the code itself:
The decryptor file is called decrypt.py

import rsa

name = input("Enter filename: ")
key = input("Enter key: ")

file = open(name, "rb")
r = file.read()
file.close()

file2 = open(key, "rb")
r2 = file2.read()
file2.close()

msg = rsa.decypt(r, r2)

file3 = open(name, "w")
file3.write(str(msg))
file3.close()

But this error comes up:

Enter filename: text.txt
Enter key: private.txt
Trace back ( most recent call last ):
    File "C:\Users\root\Desktop\Main\Python\decrypt.py", 
       line 14, in <module>
    msg = rsa.decrypt(r, r2 )
    File "C:\Users\root\AppData\Local\Programs\Python\Python37-32\lib\site-packages\rsa\pkcs1.py", line 247, in decrypt
    block size = common.byte_size(priv_key.n)
AttributeError: 'str' object has no attribute 'n'

Answer 1

msg = rsa.decrypt(r, r2 )
File "C:\Users\root\AppData\Local\Programs\Python\Python37-32\lib\site-packages\rsa\pkcs1.py", line 247, in decrypt
block size = common.byte_size(priv_key.n)
AttributeError: 'str' object has no attribute 'n'

This error indicates that the file format with the private key is incorrect. A PKCS standard format (some PEM) is expected so that the "n" field can be obtained. But since this is a different format, it does not find this field.
It is necessary to convert key files to another format, or write another decoder