Add illustration of Cython classes

Author: gjbex

source-code/cython/Classes/README.md

@@ -12,4 +12,11 @@ Illustration of using Cython extension types (aka cdef classes).
 1. `driver.py`: Python script that uses both classes.
 1. `setup.py`: Python installation file to build the Cython
    extension.
+1. `distances_cython.py`: Python script to compute distances between
+   points using Cython class.
+1. `distances_python.py`: Python script to compute distances between
+   points using Python class.
+1. `distances_internal.py`: Python script to compute distances between
+   points using Cython class, computing the distances using a static
+   class method..
 1. `Makefile`: make file to build the extension.

source-code/cython/Classes/distances_cython.py

@@ -0,0 +1,28 @@
+#!/usr/bin/env python
+
+import argparse
+import itertools
+import pyximport
+pyximport.install(pyimport=True, language_level='3str')
+from points_pure import Point
+import random
+
+
+def main():
+    arg_parser = argparse.ArgumentParser(description='compute distances')
+    arg_parser.add_argument('--n', type=int, default=10,
+                            help='number of points')
+    options = arg_parser.parse_args()
+    points = [Point(random.random(), random.random()) for _ in range(options.n)]
+    min_distance = 2.0
+    max_distance = 0.0
+    for i, p1 in enumerate(points):
+        for p2 in points[i+1:]:
+            d = p1.distance(p2)
+            min_distance = min(d, min_distance)
+            max_distance = max(d, max_distance)
+    print(f'min. distance: {min_distance}')
+    print(f'max. distance: {max_distance}')
+
+if __name__ == '__main__':
+    main()

source-code/cython/Classes/distances_internal.py

@@ -0,0 +1,22 @@
+#!/usr/bin/env python
+
+import argparse
+import itertools
+import pyximport
+pyximport.install(pyimport=True, language_level='3str')
+from points_pure import Point
+import random
+
+
+def main():
+    arg_parser = argparse.ArgumentParser(description='compute distances')
+    arg_parser.add_argument('--n', type=int, default=10,
+                            help='number of points')
+    options = arg_parser.parse_args()
+    points = [Point(random.random(), random.random()) for _ in range(options.n)]
+    min_distance, max_distance = Point.min_max_distance(points)
+    print(f'min. distance: {min_distance}')
+    print(f'max. distance: {max_distance}')
+
+if __name__ == '__main__':
+    main()

source-code/cython/Classes/distances_python.py

@@ -0,0 +1,26 @@
+#!/usr/bin/env python
+
+import argparse
+import itertools
+from points_python import Point
+import random
+
+
+def main():
+    arg_parser = argparse.ArgumentParser(description='compute distances')
+    arg_parser.add_argument('--n', type=int, default=10,
+                            help='number of points')
+    options = arg_parser.parse_args()
+    points = [Point(random.random(), random.random()) for _ in range(options.n)]
+    min_distance = 2.0
+    max_distance = 0.0
+    for i, p1 in enumerate(points):
+        for p2 in points[i+1:]:
+            d = p1.distance(p2)
+            min_distance = min(d, min_distance)
+            max_distance = max(d, max_distance)
+    print(f'min. distance: {min_distance}')
+    print(f'max. distance: {max_distance}')
+
+if __name__ == '__main__':
+    main()