'python2 -3' prints lots of deprecation warnings

[tiran]

Are these warnings worse fixing?

$ .tox/py27/bin/python -3
Python 2.7.12 (default, Sep 29 2016, 12:52:02) 
[GCC 6.2.1 20160916 (Red Hat 6.2.1-2)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import cryptography
>>> cryptography
<module 'cryptography' from '/home/heimes/dev/py/cryptography/.tox/py27/lib/python2.7/site-packages/cryptography/__init__.pyc'>
>>> import cryptography.x509.extensions
/home/heimes/dev/py/cryptography/.tox/py27/lib/python2.7/site-packages/cryptography/hazmat/primitives/asymmetric/dsa.py:150: DeprecationWarning: Overriding __eq__ blocks inheritance of __hash__ in 3.x
  class DSAParameterNumbers(object):
/home/heimes/dev/py/cryptography/.tox/py27/lib/python2.7/site-packages/cryptography/hazmat/primitives/asymmetric/dsa.py:189: DeprecationWarning: Overriding __eq__ blocks inheritance of __hash__ in 3.x
  class DSAPublicNumbers(object):
/home/heimes/dev/py/cryptography/.tox/py27/lib/python2.7/site-packages/cryptography/hazmat/primitives/asymmetric/dsa.py:227: DeprecationWarning: Overriding __eq__ blocks inheritance of __hash__ in 3.x
  class DSAPrivateNumbers(object):
/home/heimes/dev/py/cryptography/.tox/py27/lib/python2.7/site-packages/ipaddress.py:82: DeprecationWarning: Overriding __eq__ blocks inheritance of __hash__ in 3.x
  class _TotalOrderingMixin(object):
/home/heimes/dev/py/cryptography/.tox/py27/lib/python2.7/site-packages/cryptography/hazmat/primitives/constant_time.py:9: DeprecationWarning: CObject type is not supported in 3.x. Please use capsule objects instead.
  from cryptography.hazmat.bindings._constant_time import lib
/home/heimes/dev/py/cryptography/.tox/py27/lib/python2.7/site-packages/cryptography/x509/general_name.py:93: DeprecationWarning: Overriding __eq__ blocks inheritance of __hash__ in 3.x
  class DNSName(object):
/home/heimes/dev/py/cryptography/.tox/py27/lib/python2.7/site-packages/cryptography/x509/general_name.py:166: DeprecationWarning: Overriding __eq__ blocks inheritance of __hash__ in 3.x
  class DirectoryName(object):
/home/heimes/dev/py/cryptography/.tox/py27/lib/python2.7/site-packages/cryptography/x509/general_name.py:189: DeprecationWarning: Overriding __eq__ blocks inheritance of __hash__ in 3.x
  class RegisteredID(object):
/home/heimes/dev/py/cryptography/.tox/py27/lib/python2.7/site-packages/cryptography/x509/general_name.py:212: DeprecationWarning: Overriding __eq__ blocks inheritance of __hash__ in 3.x
  class IPAddress(object):
/home/heimes/dev/py/cryptography/.tox/py27/lib/python2.7/site-packages/cryptography/x509/general_name.py:247: DeprecationWarning: Overriding __eq__ blocks inheritance of __hash__ in 3.x
  class OtherName(object):
/home/heimes/dev/py/cryptography/.tox/py27/lib/python2.7/site-packages/cryptography/x509/extensions.py:165: DeprecationWarning: Overriding __eq__ blocks inheritance of __hash__ in 3.x
  class AuthorityKeyIdentifier(object):
/home/heimes/dev/py/cryptography/.tox/py27/lib/python2.7/site-packages/cryptography/x509/extensions.py:275: DeprecationWarning: Overriding __eq__ blocks inheritance of __hash__ in 3.x
  class AuthorityInformationAccess(object):
/home/heimes/dev/py/cryptography/.tox/py27/lib/python2.7/site-packages/cryptography/x509/extensions.py:389: DeprecationWarning: Overriding __eq__ blocks inheritance of __hash__ in 3.x
  class CRLDistributionPoints(object):
/home/heimes/dev/py/cryptography/.tox/py27/lib/python2.7/site-packages/cryptography/x509/extensions.py:426: DeprecationWarning: Overriding __eq__ blocks inheritance of __hash__ in 3.x
  class DistributionPoint(object):
/home/heimes/dev/py/cryptography/.tox/py27/lib/python2.7/site-packages/cryptography/x509/extensions.py:529: DeprecationWarning: Overriding __eq__ blocks inheritance of __hash__ in 3.x
  class PolicyConstraints(object):
/home/heimes/dev/py/cryptography/.tox/py27/lib/python2.7/site-packages/cryptography/x509/extensions.py:585: DeprecationWarning: Overriding __eq__ blocks inheritance of __hash__ in 3.x
  class CertificatePolicies(object):
/home/heimes/dev/py/cryptography/.tox/py27/lib/python2.7/site-packages/cryptography/x509/extensions.py:620: DeprecationWarning: Overriding __eq__ blocks inheritance of __hash__ in 3.x
  class PolicyInformation(object):
/home/heimes/dev/py/cryptography/.tox/py27/lib/python2.7/site-packages/cryptography/x509/extensions.py:662: DeprecationWarning: Overriding __eq__ blocks inheritance of __hash__ in 3.x
  class UserNotice(object):
/home/heimes/dev/py/cryptography/.tox/py27/lib/python2.7/site-packages/cryptography/x509/extensions.py:696: DeprecationWarning: Overriding __eq__ blocks inheritance of __hash__ in 3.x
  class NoticeReference(object):
/home/heimes/dev/py/cryptography/.tox/py27/lib/python2.7/site-packages/cryptography/x509/extensions.py:730: DeprecationWarning: Overriding __eq__ blocks inheritance of __hash__ in 3.x
  class ExtendedKeyUsage(object):
/home/heimes/dev/py/cryptography/.tox/py27/lib/python2.7/site-packages/cryptography/x509/extensions.py:798: DeprecationWarning: Overriding __eq__ blocks inheritance of __hash__ in 3.x
  class KeyUsage(object):
/home/heimes/dev/py/cryptography/.tox/py27/lib/python2.7/site-packages/cryptography/x509/extensions.py:884: DeprecationWarning: Overriding __eq__ blocks inheritance of __hash__ in 3.x
  class NameConstraints(object):
/home/heimes/dev/py/cryptography/.tox/py27/lib/python2.7/site-packages/cryptography/x509/extensions.py:952: DeprecationWarning: Overriding __eq__ blocks inheritance of __hash__ in 3.x
  class Extension(object):
/home/heimes/dev/py/cryptography/.tox/py27/lib/python2.7/site-packages/cryptography/x509/extensions.py:988: DeprecationWarning: Overriding __eq__ blocks inheritance of __hash__ in 3.x
  class GeneralNames(object):
/home/heimes/dev/py/cryptography/.tox/py27/lib/python2.7/site-packages/cryptography/x509/extensions.py:1031: DeprecationWarning: Overriding __eq__ blocks inheritance of __hash__ in 3.x
  class SubjectAlternativeName(object):
/home/heimes/dev/py/cryptography/.tox/py27/lib/python2.7/site-packages/cryptography/x509/extensions.py:1063: DeprecationWarning: Overriding __eq__ blocks inheritance of __hash__ in 3.x
  class IssuerAlternativeName(object):
/home/heimes/dev/py/cryptography/.tox/py27/lib/python2.7/site-packages/cryptography/x509/extensions.py:1095: DeprecationWarning: Overriding __eq__ blocks inheritance of __hash__ in 3.x
  class CertificateIssuer(object):
/home/heimes/dev/py/cryptography/.tox/py27/lib/python2.7/site-packages/cryptography/x509/base.py:179: DeprecationWarning: Overriding __eq__ blocks inheritance of __hash__ in 3.x
  class CertificateRevocationList(object):
/home/heimes/dev/py/cryptography/.tox/py27/lib64/python2.7/abc.py:87: DeprecationWarning: Overriding __eq__ blocks inheritance of __hash__ in 3.x
  cls = super(ABCMeta, mcls).__new__(mcls, name, bases, namespace)

[reaperhulk]

#2578 covers most of these, but that list does appear to show that we should implement __hash__ on DSAParameterNumbers, DSAPublicNumbers, and DSAPrivateNumbers

[alex]

I'm going to close this -- all our code works under both 2 and 3, and there's an existing issue that tracks __hash__.