hasattr()

The hasattr() function in Python is a built-in function that returns True if the specified object has the given attribute, and False if not. It takes two parameters: an object and a string representing the attribute name. This function is commonly used to check if an object has a particular attribute before trying to access it.

Parameter Values

Parameter Description
object

The object whose attribute existence is checked.
name

A string that represents the name of the attribute to check for existence.

Return Values

The hasattr() function returns a bool, either True or False.

How to Use hasattr() in Python

Example 1:

The hasattr() function in Python is used to determine if an object has the specified attribute.

class Person:
    name = 'Alice'
    age = 30

print(hasattr(Person, 'name'))  # Output: True
print(hasattr(Person, 'gender'))  # Output: False
Example 2:

It returns True if the object has the given attribute, else it returns False.

class Vehicle:
    def __init__(self, make, model):
        self.make = make
        self.model = model

car = Vehicle('Toyota', 'Corolla')
print(hasattr(car, 'make'))  # Output: True
print(hasattr(car, 'color'))  # Output: False
Example 3:

The hasattr() function can also be used to check if the object has a specific method.

class Calculator:
    def add(self, x, y):
        return x + y

calc = Calculator()
print(hasattr(calc, 'add'))  # Output: True
print(hasattr(calc, 'subtract'))  # Output: False

Built-In Functions