Lesson 13

students/grzegorz_bajorski/lesson_13_bjects_and_classes/Exercise_1.py

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+from __future__ import print_function, division
+
+import copy
+import math
+
+
+def distance_between_points(p1, p2):
+    """Computes the distance between two Point objects.
+
+    p1: Point
+    p2: Point
+
+    returns: float
+    """
+    dx = p1.x - p2.x
+    dy = p1.y - p2.y
+    dist = math.sqrt(dx**2 + dy**2)
+    return dist
+
+
+class Point:
+    """Represents a point in 2-D space.
+
+    attributes: x, y
+    """
+
+
+class Rectangle:
+    """Represents a rectangle. 
+
+    attributes: width, height, corner.
+    """
+
+
+def print_point(p):
+    """Print a Point object in human-readable format."""
+    print('(%g, %g)' % (p.x, p.y))
+
+
+class Circle:
+    """Represents a circle.
+
+    Attributes: center, radius
+    """
+
+
+def point_in_circle(point, circle):
+    """Checks whether a point lies inside a circle (or on the boundary).
+
+    point: Point object
+    circle: Circle object
+    """
+    d = distance_between_points(point, circle.center)
+    print(d)
+    return d <= circle.radius
+
+
+def rect_in_circle(rect, circle):
+    """Checks whether the corners of a rect fall in/on a circle.
+
+    rect: Rectangle object
+    circle: Circle object
+    """
+    p = copy.copy(rect.corner)
+    print_point(p)
+    if not point_in_circle(p, circle):
+        return False
+
+    p.x += rect.width
+    print_point(p)
+    if not point_in_circle(p, circle):
+        return False
+
+    p.y -= rect.height
+    print_point(p)
+    if not point_in_circle(p, circle):
+        return False
+
+    p.x -= rect.width
+    print_point(p)
+    if not point_in_circle(p, circle):
+        return False
+
+    return True
+
+
+def rect_circle_overlap(rect, circle):
+    """Checks whether any corners of a rect fall in/on a circle.
+
+    rect: Rectangle object
+    circle: Circle object
+    """
+    p = copy.copy(rect.corner)
+    print_point(p)
+    if point_in_circle(p, circle):
+        return True
+
+    p.x += rect.width
+    print_point(p)
+    if point_in_circle(p, circle):
+        return True
+
+    p.y -= rect.height
+    print_point(p)
+    if point_in_circle(p, circle):
+        return True
+
+    p.x -= rect.width
+    print_point(p)
+    if point_in_circle(p, circle):
+        return True
+
+    return False
+
+
+def main():
+    box = Rectangle()
+    box.width = 100.0
+    box.height = 200.0
+    box.corner = Point()
+    box.corner.x = 50.0
+    box.corner.y = 50.0
+
+    print(box.corner.x)
+    print(box.corner.y)
+
+    circle = Circle
+    circle.center = Point()
+    circle.center.x = 150.0
+    circle.center.y = 100.0
+    circle.radius = 75.0
+
+    print(circle.center.x)
+    print(circle.center.y)
+    print(circle.radius)
+
+    print(point_in_circle(box.corner, circle))
+    print(rect_in_circle(box, circle))
+    print(rect_circle_overlap(box, circle))
+
+
+if __name__ == '__main__':
+    main()

students/grzegorz_bajorski/lesson_13_bjects_and_classes/inspect1.py

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+def object_inspector(obj, attributes):
+    attr_dict = {}
+    for attribute in attributes:
+        value = getattr(obj, attribute)
+        attr_dict[attribute] = value
+    return attr_dict
+
+
+class Person:
+    age = 22
+    name = "aa"
+    salary = 1
+
+
+person = Person()
+attributes = ['name', 'age']
+att_dict = object_inspector(person, attributes)
+print(att_dict)

students/grzegorz_bajorski/lesson_13_bjects_and_classes/inspect2.py

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+def object_inspector(objects):
+    attr_dict = {}
+    for attribute in dir(objects):
+        value = getattr(objects, attribute)
+        if isinstance(value, (str, int, float)):
+            attr_dict[attribute] = value
+    return attr_dict
+
+
+class Person:
+    age = 22
+    name = "aa"
+    salary = 1
+
+
+person = Person()
+person2 = Person()
+person2.age = 30
+person2.name = "bb"
+
+print(object_inspector(person))
+print(object_inspector(person2))

students/grzegorz_bajorski/lesson_13_bjects_and_classes/selective_compare.py

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+def compare_attributes(obj1, obj2, attributes):
+    for attribute in attributes:
+        if getattr(obj1, attribute) != getattr(obj2, attribute):
+            return False
+    return True
+
+
+class Person:
+    age = 22
+    name = "aa"
+    salary = 1
+
+
+person = Person()
+person2 = Person()
+person2.age = 24
+person2.name = "bb"
+person2.salary = "1"
+
+attributes = ['age', 'name', 'salary']
+
+if compare_attributes(person, person2, attributes):
+    print("Compared objects are equal")
+else :
+    print("Compared objects are not equal")