Lecture 6 python oop (ewurc)

Python Lecture 6 Problem Set 6: OOP

Topic • Object Oriented Programming

Class class Point: def __init__(self, x, y): self.x = int(x) self.y = int(y) p = Point(4,4) print(type(p)) print(f'({p.x}, {p.y})') p = Point() print(type(p)) print(f'({p.x}, {p.y})')

Class 2 class Point: def __init__(self, x, y): self.x = int(x) self.y = int(y) def __init__(self, x=0, y=0): self.x = int(x) self.y = int(y) p = Point() print(type(p)) print(f'({p.x}, {p.y})')

Class: 3 class Point: def __init__(self, x=0, y=0): self.x = int(x) self.y = int(y) p = Point() print(type(p)) print(f'({p.x}, {p.y})')

Class: User Input class Point: def __init__(self, x=0, y=0): self.x = int(x) self.y = int(y) x,y = input().split(',') p = Point(x,y) print(type(p)) print(f'({p.x}, {p.y})')

Class: print class Point: def __init__(self, x=0, y=0): self.x = int(x) self.y = int(y) p = Point(4,2) print(p)

Class: Overload print class Point: def __init__(self, x=0, y=0): self.x = int(x) self.y = int(y) def __str__(self): return f"({self.x}, {self.y})" p = Point(4,2) print(p)

Class: Destructor class Point: def __init__(self, x=0, y=0): self.x = int(x) self.y = int(y) def __del__(self): print("Object Destoryed") def __str__(self): return f"({self.x}, {self.y})" p = Point(4,2) print(p)

Class: Operator Overloading class Point: def __add__(self,other): sum = Point() sum.x = self.x + other.x sum.y = self.y + other.y return sum p = Point(4,4) q = Point(2,2) r = p + q print(p) print(q) print(r)

Magic Methods: Binary Operators • https://www.python-course.eu/python3_magic_methods.php • + __add__(self, other) • - __sub__(self, other) • * __mul__(self, other) • // __floordiv__(self, other) • / __truediv__(self, other) • % __mod__(self, other) • ** __pow__(self, other[, modulo]) • << __lshift__(self, other) • >> __rshift__(self, other) • & __and__(self, other) • ^ __xor__(self, other) • | __or__(self, other)

Magic Methods: Comparison Operators • < object.__lt__(self, other) • <= object.__le__(self, other) • == object.__eq__(self, other) • != object.__ne__(self, other) • >= object.__ge__(self, other) • > object.__gt__(self, other)

Task • Distance of two Point • Is two Point Equal • Find Slope of two Point • print(p.slope(q))

Class: Distance def __sub__(self, other): r = Point() r.x = self.x - other.x r.y = self.y - other.y return math.sqrt(r.x**2 + r.y**2) p = Point(4,4) q = Point(2,2) dis = p - q print(dis)

Class: Equal def __eq__(self, other): if self.x == other.x: if self.y == other.y: return True return False p = Point(4,4) q = Point(3,4) print(p==q) p = Point(4,2) q = Point(4,2) print(p==q)

Class: Slope 1 def slope(self, other): r = Point() r.x = self.x - other.x r.y = self.y - other.y m = r.y/r.x return m p = Point(4,4) q = Point(4,2) print(p.slope(q))

Class: Slope 2 def slope(self, other): r = Point() r.x = self.x - other.x r.y = self.y - other.y try: m = r.y/r.x except: print("Error") return None return m p = Point(4,4) q = Point(4,2) print(p.slope(q))

Class: Slope 3 def slope(self, other): r = Point() r.x = self.x - other.x r.y = self.y - other.y try: m = r.y/r.x except Exception as e: print("Error: ",e) return None return m p = Point(4,4) q = Point(4,2) print(p.slope(q))

Class: Division def __truediv__(self,divisor): r = Point() try: r.x = self.x /divisor r.y = self.y /divisor except Exception as e: print("Error: ",e) return None return r p = Point(4,4) q = Point(2,2) r = p + q print(r/0) print(r/3)

Class: Inheritance #from fileName import Point from point import Point class Point3d(Point): def __init__(self, x=0, y=0, z = 0): super().__init__(x,y) self.z = int(z) p = Point3d(4,4,1) print(type(p))

Task • Write a print overload method • Distance of two Point in 3D • Is two Point Equal in 3D

Class: Inheritance def __str__(self): return f"({self.x}, {self.y}, {self.x})“ p = Point3d(4,4,1) print(type(p)) print(p)

Class: Inheritance def __str__(self): st = super().__str__() st = st[:-1] st += f", {self.z})" return st p = Point3d(4,4,1) print(type(p)) print(p)

Prepared by Mun Al Mamun President East West University Robotics Club munewu@gmail.com T h i s s l i d e i s p r o v i d e a s a c o u r s e m a t e r i a l i n t h e w o r k s h o p “ W o r k s h o p O n P y t h o n P r o g r a m m i n g ” O r g a n i z e d b y E a s t W e s t U n i v e r s i t y R o b o t i c s C l u b

Lecture 6 python oop (ewurc)

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