Create folder-based module and use VERSION file

use VERSION to avoid importing the module before it's installed

MANIFEST.in

@@ -1,2 +1,3 @@
 include README.md
 include LICENSE.md
+include float_raster/VERSION

float_raster/VERSION

@@ -0,0 +1 @@
+0.4

float_raster/__init__.py

@@ -0,0 +1,16 @@
+"""
+Module for rasterizing polygons, with float-precision anti-aliasing on
+ a non-uniform rectangular grid.
+
+See the documentation for float_raster.raster(...) for details.
+"""
+
+import pathlib
+
+from .float_raster import *
+
+__author__ = 'Jan Petykiewicz'
+
+with open(pathlib.Path(__file__).parent / 'VERSION', 'r') as f:
+    __version__ = f.read().strip()
+

float_raster/float_raster.py

@@ -1,19 +1,8 @@
-"""
-Module for rasterizing polygons, with float-precision anti-aliasing on
- a non-uniform rectangular grid.
-
-See the documentation for raster(...) for details.
-"""
-
 from typing import Tuple
 import numpy
 from numpy import logical_and, diff, floor, ceil, ones, zeros, hstack, full_like, newaxis
 from scipy import sparse
 
-__author__ = 'Jan Petykiewicz'
-
-version = '0.4'
-
 
 def raster(vertices: numpy.ndarray,
            grid_x: numpy.ndarray,

setup.py

@@ -1,20 +1,25 @@
 #!/usr/bin/env python3
 
-from setuptools import setup
-import float_raster
+from setuptools import setup, find_packages
 
 with open('README.md', 'r') as f:
     long_description = f.read()
 
+with open('float_raster/VERSION', 'r') as f:
+    version = f.read().strip()
+
 setup(name='float_raster',
-      version=float_raster.version,
+      version=version,
       description='High-precision anti-aliasing polygon rasterizer',
       long_description=long_description,
       long_description_content_type='text/markdown',
       author='Jan Petykiewicz',
       author_email='anewusername@gmail.com',
       url='https://mpxd.net/code/jan/float_raster',
-      py_modules=['float_raster'],
+      packages=find_packages(),
+      package_data={
+          'float_raster': ['VERSION']
+      },
       install_requires=[
             'numpy',
             'scipy',