[Python] What right values for cafile, capath, cadata?

There is code for ssl context creation:

import ssl

ssl_context = ssl.create_default_context(cafile=..., capath=..., cadata=...)


Also there is a docker container with certs:

$ pwd
/app/cert
$ ls
ca.pem cert.pem key.pem


What values will be for cafile, capath, cadata?

I tried cafile="/app/cert/ca.pem" and capath="/app/cert" but it gives me the error:

[SSL: SSLV3_ALERT_BAD_CERTIFICATE] sslv3 alert bad certificate (_ssl.c:1002)

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