Adding text file attachments to Keepass with pykeepass in python

I am trying to create and save KeePass entries using pykeepass and saving a .txt file as an attachment. However I get a type-error:

Traceback (most recent call last):
  File "c:\Users\Simplicissimus\Documents\coding\directory\attachment.py", line 15, in <module>
    entry.add_attachment('attachment.txt', f.read())
    ~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\Simplicissimus\AppData\Local\Programs\Python\Python313\Lib\site-packages\pykeepass\entry.py", line 163, in add_attachment
    E.Key(filename),
    ~~~~~^^^^^^^^^^
  File "src\\lxml\\builder.py", line 219, in lxml.builder.ElementMaker.__call__
TypeError: bad argument type: bytes(b'Lorem Ipsum bla bla bla\r\n')
(base) PS C:\Users\Simplicissimus\Documents\coding\directory>

My minimal reproducible example is:

from pykeepass import PyKeePass

kp = PyKeePass('testDatabase.kdbx', password='passwort')

generalGroup = kp.find_groups(name='General',first=True)
entry = kp.add_entry(
    generalGroup,  
    title='title',  
    username='username',
    password= 'password',
)

with open('loremipsum.txt', 'rb') as f:
    entry.add_attachment('attachment.txt', f.read())

kp.save()

(All files are in the same directory, the file loremipsum.txt contains the line: "Lorem Impsum bla bla bla")

How do I have to convert the file content of a .txt-file to Bytes?

I am using the pykeepass Version: 4.1.0.post1, Keepass Version 2.58 and Python 3.13.

Solution

I can't test it but examples on page pykeepass show

# add attachment data to the db
>>> binary_id = kp.add_binary(b'Hello world')

>>> kp.binaries
[b'Hello world']

# add attachment reference to entry
>>> a = e.add_attachment(binary_id, 'hello.txt')

So maybe it needs first add it as add_binary() and later attache it to entry

with open('loremipsum.txt', 'rb') as f:
    binary_id = kp.add_binary(f.read())

    a = entry.add_attachment(binary_id, 'attachment.txt')