Some Basics of Class in Python

Class/Class_Basics.py

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+class Person:
+	#not a constructor
+	def __init__(self,name):
+		self.name=name
+	def say_hi(self):
+		print('My name is :',self.name)
+p=Person('Shivam')
+p.say_hi()
+Person.say_hi(p)
+
+#  Functions Like init are called Dunders or Magic Function
+
+# Every Dunder start with __
+
+# __init__(self)
+#__del__(self)
+#__add__(self,other)    #a+b->a.__add__(b)
+#__str__(self)          #-> String Representation : a.__str__()
+#__eq__(self,other)     #-> a==b: a.__eq__(b)
+
+class Car:
+	def __init__(self,model,mileage):
+		self.model=model
+		self.mileage=mileage
+	def __str__(self):
+		return f"{self.model} {self.mileage}"
+	def __repr__(self):
+		return f"{self.model}"
+
+	def __eq__(self,other):
+		return self.mileage==other.mileage
+
+	def __add__(self,other):
+		return self.mileage+other.mileage
+
+c1=Car('a',2)
+c2=Car('b',2)
+
+print(c1+c2)
+print(c1==c2)
+print(repr(c1))
+print(str(c1))
+
+# how to make cout<<"Shivam" work on Python
+
+class Output:
+	def __lshift__(self,other):
+		print(other,end=" ")
+		return self
+
+cout=Output()
+cout<<"Shivam"<<"Bhat"<<"My Name"
+
+# Example of how referencing takes place
+
+class dog:
+	tricks=[] #Problem with declaring outside __init__ therefore declare inside __init__
+
+	def __init__(self,name):
+		self.name=name
+
+	def add_trick(self,trick):
+		self.tricks.append(trick)
+
+a=dog('Tuffy')
+a.add_trick('Fetch')
+a.add_trick('Run')
+
+print(a.tricks)
+
+b=dog('Mapple')
+print(b.tricks)