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What is _init_ in Python?
The classes in Python have the __init__() function. This function gets executed when the class is being initiated. Let’s see some key points bout __init__ -
The classes in Python have __init__() function.
Similar to constructors in Java, the __init__() function executes when the object gets created.
The __init__() function is called automatically.
It is used to assign values to the properties of an object.
The __init__() method may have arguments for flexibility. For that, the arguments given to the class instantiation operator are passed on to __init__().
When a class defines an __init__() method, class instantiation automatically invokes __init__() for the newly created class instance.
Create a class with __init__() method
Example
Let us create a class using the __init__() -
class Student: def __init__(self, name, rank, points): self.name = name self.rank = rank self.points = points # Creating an object st = Student("David", 2, 90) print("Student Name = ",st.name) print("Student Rank = ",st.rank) print("Student Points = ",st.points)
Output
Student Name = David Student Rank = 2 Student Points = 90
Create a class with __init__() and custom method
Example
We will here create a class with __init__() and a custom function will also be created and called -
class Students: def __init__(self, name, rank, points): self.name = name self.rank = rank self.points = points # custom function def demofunc(self): print("I am "+self.name) print("I got Rank ",+self.rank) # create 4 objects st1 = Students("Steve", 1, 100) st2 = Students("Chris", 2, 90) st3 = Students("Mark", 3, 76) st4 = Students("Kate", 4, 60) # call the functions using the objects created above st1.demofunc() st2.demofunc() st3.demofunc() st4.demofunc()
Output
I am Steve I got Rank 1 I am Chris I got Rank 2 I am Mark I got Rank 3 I am Kate I got Rank 4