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

AmitDiwan

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Updated on: 15-Sep-2022

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