Complete programming objects section

Author: DevOpsThinh

fundamentals/custom_functions.py

@@ -1,13 +1,67 @@
 # Author: Nguyen Truong Thinh
 # Contact me: [email protected] || +84393280504
+#
+# Custom functions section
+
+import os
+import pickle
 from math import sqrt
-import pickle, os
 
 
-# Custom functions
+def indentify(an_object):
+    """
+    [The final cornerstone principle of polymorphism].
+    A function to take an object of any type & call that object's methods
+    :param an_object: an object of any type (class, ...)
+    :return: None
+    :exception: A run-time error
+    """
+    an_object.who_am_i()
+
+
+def exam_built_in_attributes(an_object):
+    """
+    Examining built-in attributes
+    :param an_object: An instance of class
+    :return: None
+    """
+    print('\nBuilt-in instance attributes...')
+    for attrib in dir(an_object):
+        if attrib[0] == '_':
+            print(attrib)
+
+    print("\nInstance Dictionary...")
+    for i in an_object.__dict__:
+        print(i, ": ", an_object.__dict__[i])
+
+
+def exam_built_in_class_dictionary(a_class):
+    """
+    Examining built-in attributes
+    :param a_class: A class type
+    :return: None
+    """
+    print('\nClass Dictionary...')
+    for i in a_class.__dict__:
+        print(i, ": ", a_class.__dict__[i])
+
+
+def addressing_class_instance_attributes(an_object):
+    """
+    Addressing class attributes
+    :param an_object: An instance of class
+    :return: None
+    """
+    print('\nClass instances of:\n', an_object.__doc__)
+    print('\nClass instance attributes...')
+    for attrib in dir(an_object):
+        if attrib[0] != '_':
+            print(attrib, ":", getattr(an_object, attrib))
+
+
 def file_with_pickle_data(file_name):
     """
-    Pickling data for more efficient to use a machine-readable binary file.
+    Pickling data for more efficient to use a machine-readable binary file
     :param file_name: Name of the file
     :return: None
     """
@@ -138,6 +192,6 @@ def tuple_distance(tuple1, tuple2):
     return sqrt((tuple1[0] - tuple2[0]) ** 2 + (tuple1[1] - tuple2[1]) ** 2)
 
 
-def print_basic_arithmetic(result = 'I would like to have a result of arithmetic expression please.'):
+def print_basic_arithmetic(result='I would like to have a result of arithmetic expression please.'):
     # Use a breakpoint in the code line below to debug your script.
     print(f'Result: {result}')  # Press Ctrl+F8 to toggle the breakpoint.

main.py

@@ -5,6 +5,7 @@
 # Use a breakpoint in the code line below to debug your script.
 from fundamentals.custom_functions import *
 from object_oriented_mindset.cartesian_system_coordinate import Point
+from object_oriented_mindset.polygon import *
 from object_oriented_mindset.util_cartesian_system_coordinate import *
 
 # Press the green button in the gutter to run the script.
@@ -71,7 +72,6 @@
 
     cube_nums = [i ** 3 for i in range(10)]
     print(cube_nums)
-
     # Custom functions
     friends_stock_list = [info_dict_dev, info_dict_tester, info_dict_po, info_dict_boss]
     data = get_data_from_list(friends_stock_list)
@@ -87,7 +87,6 @@
     update_a_file_with_block(file_name, 'r+', content, 35)
     re_write_a_file(file_name)
     file_with_pickle_data('pickle.dat')
-
     # Objects
     p_x = Point(1, 0)
     p_y = Point(5, 3)
@@ -97,4 +96,31 @@
     del p_x
     del p_y
 
+    rect = Rectangle()
+    rect.name = 'Rectangles'
+    indentify(rect)
+    rect.set_values(4, 5)
+    print("Rectangle Area: ", rect.area())
+    rect.scale(2)
+    Polygon.scale(rect, 2)
+    print("Rectangle Area: ", rect.area())
+
+    tria = Triangle()
+    tria.name = 'Triangles'
+    indentify(tria)
+    tria.set_values(4, 5)
+    print("Triangle Area: ", tria.area())
+    tria.scale(2)
+    Polygon.scale(tria, 2)
+    print("Triangle Area: ", tria.area())
+
+    print('The number of polygons: ', tria.count)
+
+    addressing_class_instance_attributes(tria)
+    exam_built_in_attributes(tria)
+    exam_built_in_class_dictionary(Triangle)
+
+    del rect
+    del tria
+
 # See PyCharm help at https://www.jetbrains.com/help/pycharm/

object_oriented_mindset/polygon.py

@@ -0,0 +1,68 @@
+# Author: Nguyen Truong Thinh
+# Contact me: [email protected] || +84393280504
+# Programming objects:
+#           Encapsulating data
+#           Addressing class attributes
+#           Built-in attributes (on fundamentals/custom_functions.py)
+#           Collecting garbage
+#           Inheriting features
+#           Overriding base methods
+#           Harnessing polymorphism
+
+class Polygon:
+    """A base class to define Polygon properties"""
+    width = 0
+    height = 0
+    count = 0
+
+    def __int__(self, name_of_polygon):
+        """
+         Initializer function
+        :param name_of_polygon: Name of the polygon
+        :return: None
+        """
+        self.name = name_of_polygon
+
+    def who_am_i(self):
+        print('\nI\'m a polygon')
+
+    def set_values(self, width, height):
+        Polygon.width = width
+        Polygon.height = height
+        Polygon.count += 1
+
+    def scale(self, number=1):
+        print(self.name, ': Calling the base class -', number)
+
+    def __del__(self):
+        """
+        A destructor method for confirmation when Polygon instances of
+        class are destroyed.
+        :return: None
+        """
+        print(f'{self.name} Say Goodbye!')
+
+
+class Rectangle(Polygon):
+    """ A derived class that inherits from Polygon class"""
+    def area(self):
+        return self.width * self.height
+
+    def scale(self, number):
+        self.width = self.width * number
+        self.height = self.height * number
+
+    def who_am_i(self):
+        print('\nI\'m a rectangles')
+
+
+class Triangle(Polygon):
+    """ A derived class that inherits from Polygon class"""
+    def area(self):
+        return (self.width * self.height) / 2
+
+    def scale(self, number):
+        self.width = self.width * number
+
+    def who_am_i(self):
+        print('\nI\'m a triangles')