more python changes

- More robust virtualenv version detection

- Versioning adjustment as dictated in
  https://www.python.org/dev/peps/pep-0440/ after suggestions by
  @heikoheiko

- Pep8 style changes in setup.py

setup.py

@@ -1,33 +1,34 @@
 #!/usr/bin/env python
 from distutils.core import setup, Extension
-
-pyethash = Extension('pyethash', 
-        sources = [
-            'src/python/core.c', 
-            'src/libethash/util.c', 
-            'src/libethash/internal.c',
-            'src/libethash/sha3.c'],
-        depends = [
-            'src/libethash/ethash.h',
-            'src/libethash/compiler.h',
-            'src/libethash/data_sizes.h',
-            'src/libethash/endian.h',
-            'src/libethash/ethash.h',
-            'src/libethash/fnv.h',
-            'src/libethash/internal.h',
-            'src/libethash/sha3.h',
-            'src/libethash/util.h'
-            ],
-        extra_compile_args = ["-Isrc/", "-std=gnu99", "-Wall"])
-
-setup (
-       name = 'pyethash',
-       author = "Matthew Wampler-Doty",
-       author_email = "matthew.wampler.doty@gmail.com",
-       license = 'GPL',
-       version = '23',
-       url = 'https://github.com/ethereum/ethash',
-       download_url = 'https://github.com/ethereum/ethash/tarball/v23',
-       description = 'Python wrappers for ethash, the ethereum proof of work hashing function',
-       ext_modules = [pyethash],
-      )
+
+pyethash = Extension('pyethash',
+                     sources=[
+                         'src/python/core.c',
+                         'src/libethash/util.c',
+                         'src/libethash/internal.c',
+                         'src/libethash/sha3.c'],
+                     depends=[
+                         'src/libethash/ethash.h',
+                         'src/libethash/compiler.h',
+                         'src/libethash/data_sizes.h',
+                         'src/libethash/endian.h',
+                         'src/libethash/ethash.h',
+                         'src/libethash/fnv.h',
+                         'src/libethash/internal.h',
+                         'src/libethash/sha3.h',
+                         'src/libethash/util.h'
+                     ],
+                     extra_compile_args=["-Isrc/", "-std=gnu99", "-Wall"])
+
+setup(
+    name='pyethash',
+    author="Matthew Wampler-Doty",
+    author_email="matthew.wampler.doty@gmail.com",
+    license='GPL',
+    version='0.1.23',
+    url='https://github.com/ethereum/ethash',
+    download_url='https://github.com/ethereum/ethash/tarball/v23',
+    description=('Python wrappers for ethash, the ethereum proof of work'
+                 'hashing function'),
+    ext_modules=[pyethash],
+)

src/python/core.c

@@ -110,7 +110,7 @@ calc_dataset_bytes(PyObject *self, PyObject *args) {
     free(mem);
     return val;
 }
-#define DEB(...) printf(__VA_ARGS__); fflush(stdout);
+
 // hashimoto_light(full_size, cache, header, nonce)
 static PyObject *
 hashimoto_light(PyObject *self, PyObject *args) {

test/python/test.sh

@@ -3,11 +3,13 @@
 # Strict mode
 set -e
 
-# just a specific case for archlinux where python3 is the default
-if [ -f "/etc/arch-release" ]; then
-    VIRTUALENV_EXEC=virtualenv2
+if [ -x "$(which virtualenv2)" ] ; then
+   VIRTUALENV_EXEC=virtualenv2
+elif [ -x "$(which virtualenv)" ] ; then
+   VIRTUALENV_EXEC=virtualenv
 else
-    VIRTUALENV_EXEC=virtualenv
+   echo "Could not find a suitable version of virtualenv"
+   false
 fi
 
 SOURCE="${BASH_SOURCE[0]}"