ssl.OP_NO_SSLv2 - removed, because it's deprecated since py3.6
ssl.OP_NO_SSLv3 - removed, because it's deprecated since py3.6
ssl.OP_NO_TLSv1 - enabled only on py3.6, because it's deprecated since py3.7
ssl.OP_NO_TLSv1_1 - enabled only on py3.6, because it's deprecated since py3.7