/usr/lib/python3.7/test/secp384r1.pem is in libpython3.7-testsuite 3.7.0~b3-1.
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 6 7 | $ openssl genpkey -genparam -algorithm EC -pkeyopt ec_paramgen_curve:secp384r1 -pkeyopt ec_param_enc:named_curve -text
-----BEGIN EC PARAMETERS-----
BgUrgQQAIg==
-----END EC PARAMETERS-----
ECDSA-Parameters: (384 bit)
ASN1 OID: secp384r1
NIST CURVE: P-384
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