/usr/lib/python2.7/dist-packages/cryptography_vectors/asymmetric/PKCS8/ec_private_key.pem is in python-cryptography-vectors 0.6.1-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 | -----BEGIN PRIVATE KEY-----
MIGHAgEAMBMGByqGSM49AgEGCCqGSM49AwEHBG0wawIBAQQgYirTZSx+5O8Y6tlG
cka6W6btJiocdrdolfcukSoTEk+hRANCAAQkvPNu7Pa1GcsWU4v7ptNfqCJVq8Cx
zo0MUVPQgwJ3aJtNM1QMOQUayCrRwfklg+D/rFSUwEUqtZh7fJDiFqz3
-----END PRIVATE KEY-----
|