Python hasattr() built-in function

From the Python 3 documentation

The arguments are an object and a string. The result is True if the string is the name of one of the object’s attributes, False if not. (This is implemented by calling getattr(object, name) and seeing whether it raises an AttributeError or not.)

Introduction

The hasattr() function checks if an object has a given attribute. It takes the object and the attribute name (as a string) as arguments and returns True if the attribute exists, and False otherwise.

Example

class Person:
    name = "John"
    age = 30

p = Person()

print(hasattr(p, 'name'))
print(hasattr(p, 'age'))
print(hasattr(p, 'email'))

True
True
False