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))

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))

Class: 3
class Point:
self.x = int(x)
self.y = int(y)
p = Point()
print(type(p))

Class: User Input
class Point:
self.x = int(x)
self.y = int(y)
x,y = input().split(',')
p = Point(x,y)
print(type(p))

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

Class: Overload print
class Point:
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:
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()
m = r.y/r.x
return m
p = Point(4,4)
q = Point(4,2)
print(p.slope(q))

Class: Slope 2
r = Point()
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
r = Point()
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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