How do I check if an object has an attribute?

You can use the hasattr function to check if an object has an attribute. For example:

Check if an object has an attribute in Python using the hasattr function

class MyClass:
    def __init__(self):
        self.attr = 1

obj = MyClass()

if hasattr(obj, 'attr'):
    print('obj has attribute attr')
else:
    print('obj does not have attribute attr')

This will print "obj has attribute attr".

You can also use the getattr function to retrieve the value of an attribute, if it exists, or a default value if it does not. For example:

Check if an object has an attribute in Python using the getattr function

value = getattr(obj, 'attr', 0)
print(value)  # prints 1

value = getattr(obj, 'other_attr', 0)
print(value)  # prints 0

This can be useful if you want to retrieve the value of an attribute but you are not sure if the attribute exists or not.