Add pure Python Cython implementation

Author: gjbex

source-code/cython/Classes/Makefile

@@ -1,11 +1,12 @@
 VERSION = cpython-311-x86_64-linux-gnu
-PRIMES_LIB = primes_cython.$(VERSION).so
+POINTS_LIB = points.$(VERSION).so
+POINTS_PURE_LIB = points_pure.$(VERSION).so
 
-all: $(PRIMES_LIB)
+all: $(POINTS_LIB)
 
-$(PRIMES_LIB): points.pyx
+$(POINTS_LIB): points.pyx points_pure.py
 	python setup.py build_ext --inplace
 
 clean:
 	python setup.py clean
-	$(RM) primes_cython.c $(PRIMES_LIB)
+	$(RM) points.c points_pure.c $(POINTS_LIB) $(POINTS_PURE_LIB)

source-code/cython/Classes/driver_pure.py

@@ -0,0 +1,14 @@
+#!/usr/bin/env python
+
+import pyximport
+pyximport.install(pyimport=True, language_level='3str')
+
+from points_pure import Point, ColoredPoint
+
+p = Point(1.0, -2.0)
+print(p)
+print(f'point = {p.x}, {p.y}')
+print(p.distance())
+
+p1 = ColoredPoint(1.0, -2.0, 'blue')
+print(p1.color)

source-code/cython/Classes/points_pure.py

@@ -0,0 +1,52 @@
+import cython
+from math import sqrt
+
+@cython.cclass
+class Point:
+    
+    x: cython.float
+    y: cython.float
+    
+    def __init__(self, x: cython.float, y: cython.float) -> None:
+        self.x = x
+        self.y = y
+        
+    def distance(self) -> cython.float:
+        return sqrt(self.x**2 + self.y**2)
+    
+    @property
+    def x(self) -> cython.float:
+        return self.x
+
+    @x.setter
+    def x(self, value: cython.float) -> None:
+        self.x = float(value)
+
+    @property
+    def y(self) -> cython.float:
+        return self.y
+
+    @y.setter
+    def y(self, value: cython.float) -> None:
+        self.y = float(value)
+
+    def __str__(self) -> str:
+        return f"Point({self.x}, {self.y})"
+
+
+class ColoredPoint(Point):
+
+    def __init__(self, x, y, color):
+        super().__init__(x, y)
+        self._color = color
+
+    @property
+    def color(self):
+        return self._color
+
+    @color.setter
+    def color(self, value):
+        self._color = str(value)
+
+    def __str__(self):
+        return f"ColoredPoint({self.x}, {self.y}, {self.color})"

source-code/cython/Classes/setup.py

@@ -4,5 +4,6 @@
 from Cython.Build import cythonize
 
 setup(
-    ext_modules=cythonize('points.pyx', language_level='3str')
+    ext_modules=cythonize(['points.pyx', 'points_pure.py'],
+                          language_level='3str')
 )