diff --git a/students/dychowicz_monika/lesson_13_objects_and_classes/README.md b/students/dychowicz_monika/lesson_13_objects_and_classes/README.md
new file mode 100644
index 000000000..07a701571
--- /dev/null
+++ b/students/dychowicz_monika/lesson_13_objects_and_classes/README.md
@@ -0,0 +1,14 @@
+### Lesson 13 - Objects and classes
+#### introduction
+- [Think Python: How to Think Like a Computer Scientist / Chapter 15](http://greenteapress.com/thinkpython2/html/thinkpython2016.html)
+- [Python dir()
+ function](https://www.programiz.com/python-programming/methods/built-in/dir)
+- [Python id() function](https://www.programiz.com/python-programming/methods/built-in/id)
+- [Python isinstance() function](https://www.programiz.com/python-programming/methods/built-in/isinstance)
+- [How To Construct Classes and Define Objects in Python 3](https://www.digitalocean.com/community/tutorials/how-to-construct-classes-and-define-objects-in-python-3) (supplementary materials)
+- [Understanding Class and Instance Variables in Python 3](https://www.digitalocean.com/community/tutorials/understanding-class-and-instance-variables-in-python-3) (supplementary materials)
+#### practice projects
+1. [Think Python: How to Think Like a Computer Scientist / Chapter 15 / Exercise 1 ](http://greenteapress.com/thinkpython2/html/thinkpython2016.html)
+1. Object inspector 1 - write a function that for a given object and list of attribute names returns dictionary with names and values of object's attributes.
+1. Object inspector 2 - write a function that for a given object returns dictionary with names and values of all object's attributes that are instances of string, integer or float.
+1. Selective shallow compare - write a function that for given 2 objects and list of attribute names checks if objects' attributes are equal.
\ No newline at end of file
diff --git a/students/dychowicz_monika/lesson_13_objects_and_classes/chapter_exercise1.py b/students/dychowicz_monika/lesson_13_objects_and_classes/chapter_exercise1.py
new file mode 100644
index 000000000..96463b678
--- /dev/null
+++ b/students/dychowicz_monika/lesson_13_objects_and_classes/chapter_exercise1.py
@@ -0,0 +1,92 @@
+import math
+
+
+class Point:
+    def __init__(self, x=0, y=0):
+        """ Create a new point at the origin """
+        self.x = x
+        self.y = y
+
+
+class Circle:
+    def __init__(self, center, radius):
+        self.center = center
+        self.radius = radius
+
+
+class Rectangle:
+    def __init__(self, topLeft, topRight, bottomLeft, bottomRight):
+        self.tL = topLeft
+        self.tR = topRight
+        self.bL = bottomLeft
+        self.bR = bottomRight
+
+def point_in_circle(point, circle):
+    distance_between_points = math.sqrt((point.x - circle.center.x)** 2 +
+                                        (point.y - circle.center.y)**2)
+    return distance_between_points <= circle.radius
+
+
+def point_in_circle_bounduary(point, circle):
+    distance_between_points = math.sqrt((point.x - circle.center.x)** 2 +
+                                        (point.y - circle.center.y)**2)
+    return distance_between_points == circle.radius
+
+
+def rect_circle(rectangle, circle):
+    check_tL = point_in_circle_bounduary(rectangle.tL, circle)
+    check_tR = point_in_circle_bounduary(rectangle.tR, circle)
+    check_bL = point_in_circle_bounduary(rectangle.bL, circle)
+    check_bR = point_in_circle_bounduary(rectangle.bL, circle)
+    return check_tL and check_tR and check_bL and check_bR
+
+
+def rect_circle_overlap(rectangle, circle):
+    check_tL = point_in_circle(rectangle.tL, circle)
+    check_tR = point_in_circle(rectangle.tR, circle)
+    check_bL = point_in_circle(rectangle.bL, circle)
+    check_bR = point_in_circle(rectangle.bL, circle)
+    return check_tL and check_tR and check_bL and check_bR
+
+
+def main():
+    point1 = Point(370,550)
+    circle_center = Point(150, 100)
+    my_circle = Circle(circle_center, 75)
+    print('Is point(%s, %s) in the circle(center=(%s, %s), radious=%s)?'
+          % (point1.x, point1.y, circle_center.x, circle_center.y,
+             my_circle.radius))
+    print(point_in_circle(point1, my_circle))
+
+    # rectangle in circle
+    # rectangle1 = Rectangle(Point(1,10),Point(6,10), Point(1,5), Point(6,5))
+    rectangles_points = (Point(-2, 2), Point(2, 2), Point(-2, -2), Point(2, -2))
+    rectangle2 = Rectangle(*rectangles_points)
+    circle_center = Point(0, 0)
+    my_circle2 = Circle(circle_center, math.sqrt(8))
+    print('Is rectangle:((%s,%s),(%s,%s),(%s,%s),(%s,%s)) in the circle'
+          '(center=(%s, %s),radius=%s) board?'
+          % (rectangle2.tL.x, rectangle2.tL.y, rectangle2.tR.x, rectangle2.tR.y,
+             rectangle2.bL.x, rectangle2.bL.y, rectangle2.bL.x, rectangle2.bL.y,
+             circle_center.x, circle_center.y, my_circle2.radius))
+    print(rect_circle(rectangle2, my_circle2))
+
+    # rectangle in circle overlap
+    # rectangle1 = Rectangle(Point(1,10),Point(6,10), Point(1,5), Point(6,5))
+    rectangles_points = (Point(1, 10), Point(6, 10), Point(1, 5), Point(6, 5))
+    rectangle2 = Rectangle(*rectangles_points)
+    circle_center = Point(2, 3)
+    my_circle2 = Circle(circle_center, 20)
+    print('Is rectangle:((%s,%s),(%s,%s),(%s,%s),(%s,%s)) in the circle'
+          '(center=(%s, %s),radius=%s)?'
+          % (rectangle2.tL.x, rectangle2.tL.y, rectangle2.tR.x, rectangle2.tR.y,
+             rectangle2.bL.x, rectangle2.bL.y, rectangle2.bL.x, rectangle2.bL.y,
+             circle_center.x, circle_center.y, my_circle.radius))
+    print(rect_circle_overlap (rectangle2, my_circle2))
+
+
+
+if __name__ == "__main__":
+    main()
+
+
diff --git a/students/dychowicz_monika/lesson_13_objects_and_classes/object_inspector1.py b/students/dychowicz_monika/lesson_13_objects_and_classes/object_inspector1.py
new file mode 100644
index 000000000..ca7645d0c
--- /dev/null
+++ b/students/dychowicz_monika/lesson_13_objects_and_classes/object_inspector1.py
@@ -0,0 +1,31 @@
+class Point:
+    def __init__(self, x=0, y=0):
+        """ Create a new point at the origin """
+        self.x = x
+        self.y = y
+
+
+def object_inspector1(instance, keys):
+    instance_all = instance.__dict__
+    selected_keys = {key:instance_all[key] for key in keys}
+    return(selected_keys)
+
+
+def main():
+    ainspector = Point()
+    ainspector.g = 7
+    ainspector.x = 12
+    ainspector.b = [77, 88]
+    ainspector.c = 4
+    ainspector.y = {'c':77, 'g':88}
+    ainspector.s = "sssss"
+    ainspector.p = 4.564744
+    ainspector.q = 5
+    ainspector.m = 4.564744
+
+    a = ['b', 'x', 'y', 'p', 's']
+    print(object_inspector1(ainspector, a))
+
+
+if __name__ == "__main__":
+    main()
\ No newline at end of file
diff --git a/students/dychowicz_monika/lesson_13_objects_and_classes/object_inspector2.py b/students/dychowicz_monika/lesson_13_objects_and_classes/object_inspector2.py
new file mode 100644
index 000000000..7705e98d6
--- /dev/null
+++ b/students/dychowicz_monika/lesson_13_objects_and_classes/object_inspector2.py
@@ -0,0 +1,33 @@
+class Point:
+    def __init__(self, x=0, y=0):
+        """ Create a new point at the origin """
+        self.x = x
+        self.y = y
+
+
+def object_inspector2(instance, keys):
+    instance_all = instance.__dict__
+    selected_keys = {key: instance_all[key] for key in keys
+                     if (isinstance(instance_all[key], int) or
+                     isinstance(instance_all[key], str) or
+                     isinstance(instance_all[key], float))}
+    return(selected_keys)
+
+
+def main():
+    ainspector = Point()
+    ainspector.g = 7
+    ainspector.x = 12
+    ainspector.b = [77, 88]
+    ainspector.c = 4
+    ainspector.y = {'c':77, 'g':88}
+    ainspector.s = "sssss"
+    ainspector.p = 4.564744
+    ainspector.q = 5
+    ainspector.m = 4.564744
+
+    a = ['b', 'x', 'y', 'p', 's']
+    print(object_inspector2(ainspector, a))
+
+if __name__ == "__main__":
+    main()
\ No newline at end of file
diff --git a/students/dychowicz_monika/lesson_13_objects_and_classes/selective_shallow_compare.py b/students/dychowicz_monika/lesson_13_objects_and_classes/selective_shallow_compare.py
new file mode 100644
index 000000000..12cce2972
--- /dev/null
+++ b/students/dychowicz_monika/lesson_13_objects_and_classes/selective_shallow_compare.py
@@ -0,0 +1,44 @@
+class Point:
+    def __init__(self, x=0, y=0):
+        """ Create a new point at the origin """
+        self.x = x
+        self.y = y
+
+
+def compere_objects(instance1, instance2, keys):
+    instance1_all = instance1.__dict__
+    instance2_all = instance2.__dict__
+    compare_result = {key: (instance1_all[key] == instance2_all[key])
+                      for key in keys}
+    return(compare_result)
+
+
+def main():
+    ainspector = Point()
+    ainspector.g = 7
+    ainspector.x = 12
+    ainspector.b = [77, 88]
+    ainspector.c = 4
+    ainspector.y = {'c':77, 'g':88}
+    ainspector.s = "sssss"
+    ainspector.p = 4.564744
+    ainspector.q = 5
+    ainspector.m = 4.564744
+
+    binspector = Point()
+    binspector.g = 7
+    binspector.x = 5
+    binspector.b = [22, 88]
+    binspector.c = 4
+    binspector.y = {'c':77, 'g':88}
+    binspector.s = "ssassss"
+    binspector.p = 4.564744
+    binspector.q = 5
+    ainspector.m = 4.564744
+
+    attributes = ['b', 'x', 'y', 'p', 's']
+    print(compere_objects(ainspector, binspector, attributes))
+
+
+if __name__ == "__main__":
+    main()
\ No newline at end of file