Drop support for python 3.3 and python 3.4

As Github actions is dropping support for Ubuntu-18.04 images and
those are the only ones that support easy execution of python 3.3 and
python 3.4 environments, support for py3.3 and 3.4 would be hard to
ensure.

For old systems python 2.6 and 2.7 support will remain.

7 files changed, 10 insertions, 57 deletions

diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 112719c..44c169e 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -47,14 +47,6 @@ jobs:
             os: ubuntu-18.04
             python-version: 2.7
             tox-env: gmpy2py27
-          - name: py3.3
-            os: ubuntu-18.04
-            python-version: 3.3
-            tox-env: py33
-          - name: py3.4
-            os: ubuntu-18.04
-            python-version: 3.4
-            tox-env: py34
           - name: py3.5
             os: ubuntu-18.04
             python-version: 3.5
diff --git a/README.md b/README.md
index 11a0016..7cffeb1 100644
--- a/README.md
+++ b/README.md
@@ -45,7 +45,7 @@ curves over prime fields.
 ## Dependencies
 
 This library uses only Python and the 'six' package. It is compatible with
-Python 2.6, 2.7, and 3.3+. It also supports execution on alternative
+Python 2.6, 2.7, and 3.5+. It also supports execution on alternative
 implementations like pypy and pypy3.
 
 If `gmpy2` or `gmpy` is installed, they will be used for faster arithmetic.
diff --git a/build-requirements-3.3.txt b/build-requirements-3.3.txt
deleted file mode 100644
index d817d2b..0000000
--- a/build-requirements-3.3.txt
+++ /dev/null
@@ -1,9 +0,0 @@
-git+https://github.com/tomato42/coveralls-python.git@add-py26#egg=coveralls
-pluggy<0.6
-tox<3
-wheel<0.30
-virtualenv==15.2.0
-enum34
-hypothesis<3.44
-coverage<5.0
-urllib3<=1.25.8
diff --git a/build-requirements-3.4.txt b/build-requirements-3.4.txt
deleted file mode 100644
index ee734d1..0000000
--- a/build-requirements-3.4.txt
+++ /dev/null
@@ -1,7 +0,0 @@
-tox
-git+https://github.com/tomato42/coveralls-python.git@add-py26#egg=coveralls
-hypothesis
-pytest>=4.6.0
-PyYAML<5.3
-coverage
-attrs<21
diff --git a/setup.py b/setup.py
index f6a1dd1..6294117 100755
--- a/setup.py
+++ b/setup.py
@@ -27,15 +27,13 @@ setup(
     package_dir={"": "src"},
     license="MIT",
     cmdclass=commands,
-    python_requires=">=2.6, !=3.0.*, !=3.1.*, !=3.2.*",
+    python_requires=">=2.6, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*",
     classifiers=[
         "Programming Language :: Python",
         "Programming Language :: Python :: 2",
         "Programming Language :: Python :: 2.6",
         "Programming Language :: Python :: 2.7",
         "Programming Language :: Python :: 3",
-        "Programming Language :: Python :: 3.3",
-        "Programming Language :: Python :: 3.4",
         "Programming Language :: Python :: 3.5",
         "Programming Language :: Python :: 3.6",
         "Programming Language :: Python :: 3.7",
diff --git a/src/ecdsa/_compat.py b/src/ecdsa/_compat.py
index 83d41a5..f409a1a 100644
--- a/src/ecdsa/_compat.py
+++ b/src/ecdsa/_compat.py
@@ -91,28 +91,13 @@ if sys.version_info < (3, 0):  # pragma: no branch
         raise ValueError("Only 'big' or 'little' endian supported")
 
 else:
-    if sys.version_info < (3, 4):  # pragma: no branch
-        # on python 3.3 hmac.hmac.update() accepts only bytes, on newer
-        # versions it does accept memoryview() also
-        def hmac_compat(data):
-            if not isinstance(data, bytes):  # pragma: no branch
-                return bytes(data)
-            return data
-
-        def normalise_bytes(buffer_object):
-            """Cast the input into array of bytes."""
-            if not buffer_object:
-                return b""
-            return memoryview(buffer_object).cast("B")
 
-    else:
-
-        def hmac_compat(data):
-            return data
+    def hmac_compat(data):
+        return data
 
-        def normalise_bytes(buffer_object):
-            """Cast the input into array of bytes."""
-            return memoryview(buffer_object).cast("B")
+    def normalise_bytes(buffer_object):
+        """Cast the input into array of bytes."""
+        return memoryview(buffer_object).cast("B")
 
     def compat26_str(val):
         return val
diff --git a/tox.ini b/tox.ini
index 4686486..390b737 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,18 +1,13 @@
 
 [tox]
-envlist = py26, py27, py33, py34, py35, py36, py37, py38, py39, py310, py311, py, pypy, pypy3, gmpy2py27, gmpy2py39, gmpy2py310, gmpypy27, gmpypy39, gmpypy310, codechecks
+envlist = py26, py27, py35, py36, py37, py38, py39, py310, py311, py, pypy, pypy3, gmpy2py27, gmpy2py39, gmpy2py310, gmpypy27, gmpypy39, gmpypy310, codechecks
 
 [testenv]
 deps =
-     py{33}: py<1.5
-     py{33}: pytest<3.3
-     py{33}: enum34
-     py{33}: hypothesis<3.44
      py{26}: unittest2
      py{26}: hypothesis<3
-     py{34}: attrs<21
-     py{26,27,34,35,36,37,38,39,310,311,py,py3}: pytest
-     py{27,34,35,36,37,38,39,310,311,py,py3}: hypothesis
+     py{26,27,35,36,37,38,39,310,311,py,py3}: pytest
+     py{27,35,36,37,38,39,310,311,py,py3}: hypothesis
      gmpy2py{27,39,310,311}: gmpy2
      gmpypy{27,39,310,311}: gmpy
      gmpy{2py27,2py39,2py310,2py311,py27,py39,py310,py311}: pytest
@@ -31,7 +26,6 @@ deps =
      py27_old_gmpy2: hypothesis
      py: pytest
      py: hypothesis
-     py{33}: wheel<0.30
      coverage
 commands = coverage run --branch -m pytest {posargs:src/ecdsa}