/usr/lib/python3/dist-packages/Cryptodome/SelfTest/PublicKey/test_vectors/ECC/ecc_p256_private_p8.pem is in python3-pycryptodome 3.4.7-1ubuntu1.
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 6 | -----BEGIN ENCRYPTED PRIVATE KEY-----
MIGwMBsGCSqGSIb3DQEFAzAOBAjtAa3UT6r2WAICCAAEgZA1MjDX/jkmLeNTlbCK
oDJPqo9OzHoZInlg4diuvId3uAPxyYnMuwTJvCSklOPXQLkgpYsYRF3YgNBuGAld
VQvWcbfwX1eQSqOx6FBCWJgXpWLhlI9qViRDYNQfyam8Xszq7tOdsOdJhSuA+YCt
5mBj57E8tUNLLR6P3lAUIM8WJBlxOWyR0EqdM5vcxYIzzTM=
-----END ENCRYPTED PRIVATE KEY-----
|