Python GNUPG - Trust Imported Key?

Question

Similar to this: gnupg: There is no assurance this key belongs to the named user

But I want to set the trust level of an imported key pair within Python. Is this possible? And if so, how?

At the moment after trying to encrypt a file with the public key, I'm receiving the message:

"There is no assurance this key belongs to the named user\r\n[GNUPG:] INV_RECP 10 TestUser@Company.Com\r\n[GNUPG:] FAILURE sign-encrypt 53\r\ngpg: [stdin]: sign+encrypt failed: Unusable public key\r\n"

This is after running the following:

with open('Test.txt', 'rb') as f:
                status = gpg.encrypt_file(
                    f,sign=public_key_fingerprint,
                    recipients=private_key_recipient,
                    output = output_file
                )

status.status returns:

'invalid recipient'

EDIT:

private_key_recipient = 'TestUser@Company.Com'

Answer 1

Looking at pydoc gnupg I see:

trust_keys(self, fingerprints, trustlevel) 

It's not documented, but it sounds like what you want.