expunge python 2.6 (#3962)

* expunge python 2.6

* how did THAT happen

* remove another unsupported python from the tox envlist

* hypothesis can now be unconditionally imported

12 files changed, 15 insertions, 45 deletions

diff --git a/.jenkins/Jenkinsfile-cryptography-wheel-builder b/.jenkins/Jenkinsfile-cryptography-wheel-builder
index ae749cc60..a8f0980e6 100644
--- a/.jenkins/Jenkinsfile-cryptography-wheel-builder
+++ b/.jenkins/Jenkinsfile-cryptography-wheel-builder
@@ -22,18 +22,16 @@ def configs = [
         label: 'docker',
         imageName: 'pyca/cryptography-manylinux1:i686',
         versions: [
-            'cp26-cp26m', 'cp26-cp26mu', 'cp27-cp27m',
-            'cp27-cp27mu', 'cp34-cp34m', 'cp35-cp35m',
-            'cp36-cp36m'
+            'cp27-cp27m', 'cp27-cp27mu', 'cp34-cp34m',
+            'cp35-cp35m', 'cp36-cp36m'
         ],
     ],
     [
         label: 'docker',
         imageName: 'pyca/cryptography-manylinux1:x86_64',
         versions: [
-            'cp26-cp26m', 'cp26-cp26mu', 'cp27-cp27m',
-            'cp27-cp27mu', 'cp34-cp34m', 'cp35-cp35m',
-            'cp36-cp36m'
+            'cp27-cp27m', 'cp27-cp27mu', 'cp34-cp34m',
+            'cp35-cp35m', 'cp36-cp36m'
         ],
     ],
 ]
diff --git a/.travis.yml b/.travis.yml
index a2cafef2b..467975379 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -19,8 +19,6 @@ branches:
 matrix:
     include:
         # these are just to make travis's UI a bit prettier
-        - python: 2.6
-          env: TOXENV=py26
         - python: 2.7
           env: TOXENV=py27
         - python: 3.4
diff --git a/CHANGELOG.rst b/CHANGELOG.rst
index a8a48a6ed..b4ca5acdc 100644
--- a/CHANGELOG.rst
+++ b/CHANGELOG.rst
@@ -8,6 +8,7 @@ Changelog
 
 .. note:: This version is not yet released and is under active development.
 
+* **BACKWARDS INCOMPATIBLE:** Support for Python 2.6 has been dropped.
 
 .. _v2-1:
 
diff --git a/Jenkinsfile b/Jenkinsfile
index bac0067a5..0e4c60cee 100644
--- a/Jenkinsfile
+++ b/Jenkinsfile
@@ -5,11 +5,11 @@ if (env.BRANCH_NAME == "master") {
 def configs = [
     [
         label: 'windows',
-        toxenvs: ['py26', 'py27', 'py34', 'py35', 'py36'],
+        toxenvs: ['py27', 'py34', 'py35', 'py36'],
     ],
     [
         label: 'windows64',
-        toxenvs: ['py26', 'py27', 'py34', 'py35', 'py36'],
+        toxenvs: ['py27', 'py34', 'py35', 'py36'],
     ],
     [
         label: 'freebsd11',
@@ -206,7 +206,6 @@ def build(toxenv, label, imageName, artifacts, artifactExcludes) {
                 withEnv(["LABEL=$label", "TOXENV=$toxenv", "IMAGE_NAME=$imageName"]) {
                     if (label.contains("windows")) {
                         def pythonPath = [
-                            py26: "C:\\Python26\\python.exe",
                             py27: "C:\\Python27\\python.exe",
                             py34: "C:\\Python34\\python.exe",
                             py35: "C:\\Python35\\python.exe",
diff --git a/README.rst b/README.rst
index 350dc721e..15576662f 100644
--- a/README.rst
+++ b/README.rst
@@ -18,7 +18,7 @@ pyca/cryptography
 
 ``cryptography`` is a package which provides cryptographic recipes and
 primitives to Python developers.  Our goal is for it to be your "cryptographic
-standard library". It supports Python 2.6-2.7, Python 3.4+, and PyPy 5.3+.
+standard library". It supports Python 2.7, Python 3.4+, and PyPy 5.3+.
 
 ``cryptography`` includes both high level recipes and low level interfaces to
 common cryptographic algorithms such as symmetric ciphers, message digests, and
diff --git a/docs/development/getting-started.rst b/docs/development/getting-started.rst
index 0d7c91ea6..55dfd6cbd 100644
--- a/docs/development/getting-started.rst
+++ b/docs/development/getting-started.rst
@@ -75,10 +75,9 @@ each supported Python version and run the tests. For example:
 
     $ tox
     ...
-    ERROR:   py26: InterpreterNotFound: python2.6
      py27: commands succeeded
     ERROR:   pypy: InterpreterNotFound: pypy
-     py33: commands succeeded
+     py34: commands succeeded
      docs: commands succeeded
      pep8: commands succeeded
 
diff --git a/docs/installation.rst b/docs/installation.rst
index 70668656d..35bfbbafe 100644
--- a/docs/installation.rst
+++ b/docs/installation.rst
@@ -10,7 +10,7 @@ You can install ``cryptography`` with ``pip``:
 Supported platforms
 -------------------
 
-Currently we test ``cryptography`` on Python 2.6, 2.7, 3.4, 3.5, 3.6, and
+Currently we test ``cryptography`` on Python 2.7, 3.4, 3.5, 3.6, and
 PyPy 5.3+ on these operating systems.
 
 * x86-64 CentOS 7.x
@@ -21,10 +21,6 @@ PyPy 5.3+ on these operating systems.
 * x86-64 Alpine (latest)
 * 32-bit and 64-bit Python on 64-bit Windows Server 2012
 
-.. warning::
-    Python 2.6 is no longer supported by the Python core team. The next release
-    of ``cryptography`` will drop support for Python 2.6.
-
 We test compiling with ``clang`` as well as ``gcc`` and use the following
 OpenSSL releases:
 
@@ -49,7 +45,7 @@ just run
 If you prefer to compile it yourself you'll need to have OpenSSL installed.
 You can compile OpenSSL yourself as well or use the binaries we build for our
 release infrastructure (`openssl-release`_). Be sure to download the proper
-version for your architecture and Python (2010 works for Python 2.6, 2.7, 3.3,
+version for your architecture and Python (2010 works for Python 2.7, 3.3,
 and 3.4 while 2015 is required for 3.5 and above). Wherever you place your copy
 of OpenSSL you'll need to set the ``LIB`` and ``INCLUDE`` environment variables
 to include the proper locations. For example:
diff --git a/setup.py b/setup.py
index c5a42b207..cf79b6610 100644
--- a/setup.py
+++ b/setup.py
@@ -49,9 +49,8 @@ test_requirements = [
     "pretend",
     "iso8601",
     "pytz",
+    "hypothesis>=1.11.4",
 ]
-if sys.version_info[:2] > (2, 6):
-    test_requirements.append("hypothesis>=1.11.4")
 
 
 # If there's no vectors locally that probably means we are in a tarball and
@@ -260,7 +259,6 @@ setup(
         "Operating System :: Microsoft :: Windows",
         "Programming Language :: Python",
         "Programming Language :: Python :: 2",
-        "Programming Language :: Python :: 2.6",
         "Programming Language :: Python :: 2.7",
         "Programming Language :: Python :: 3",
         "Programming Language :: Python :: 3.4",
diff --git a/src/cryptography/__init__.py b/src/cryptography/__init__.py
index e5c34a271..6da0b3830 100644
--- a/src/cryptography/__init__.py
+++ b/src/cryptography/__init__.py
@@ -4,9 +4,6 @@
 
 from __future__ import absolute_import, division, print_function
 
-import sys
-import warnings
-
 from cryptography.__about__ import (
     __author__, __copyright__, __email__, __license__, __summary__, __title__,
     __uri__, __version__
@@ -17,11 +14,3 @@ __all__ = [
     "__title__", "__summary__", "__uri__", "__version__", "__author__",
     "__email__", "__license__", "__copyright__",
 ]
-
-if sys.version_info[:2] == (2, 6):
-    warnings.warn(
-        "Python 2.6 is no longer supported by the Python core team, please "
-        "upgrade your Python. The next version of cryptography will drop "
-        "support for Python 2.6",
-        DeprecationWarning
-    )
diff --git a/src/cryptography/utils.py b/src/cryptography/utils.py
index 986b504f5..02eec2098 100644
--- a/src/cryptography/utils.py
+++ b/src/cryptography/utils.py
@@ -100,12 +100,8 @@ def verify_interface(iface, klass):
             )
 
 
-if sys.version_info >= (2, 7):
-    def bit_length(x):
-        return x.bit_length()
-else:
-    def bit_length(x):
-        return len(bin(x)) - (2 + (x <= 0))
+def bit_length(x):
+    return x.bit_length()
 
 
 class _DeprecatedValue(object):
diff --git a/tests/hypothesis/__init__.py b/tests/hypothesis/__init__.py
index 0b3440667..4b540884d 100644
--- a/tests/hypothesis/__init__.py
+++ b/tests/hypothesis/__init__.py
@@ -3,7 +3,3 @@
 # for complete details.
 
 from __future__ import absolute_import, division, print_function
-
-import pytest
-# hypothesis no longer supports Python 2.6 so we simply skip it there
-pytest.importorskip("hypothesis")
diff --git a/tox.ini b/tox.ini
index b8def744a..03c4c0749 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,6 +1,6 @@
 [tox]
 minversion = 2.4
-envlist = py26,py27,pypy,py33,py34,py35,py36,docs,pep8,py3pep8
+envlist = py27,pypy,py34,py35,py36,docs,pep8,py3pep8
 
 [testenv]
 extras =