How to check if an object has an attribute in Python?
To check if an object has an attribute in Python, you can use the hasattr
function. This function takes two arguments: the object and the attribute name as a string. It returns True
if the object has the attribute, and False
if it does not.
For example:
class MyClass:
def __init__(self):
self.attribute = 'attribute'
obj = MyClass()
hasattr(obj, 'attribute') # returns True
hasattr(obj, 'other_attribute') # returns False
You can also use the getattr
function to check if an object has an attribute, but hasattr
is generally more convenient.
class MyClass:
def __init__(self):
self.attribute = 'attribute'
obj = MyClass()
getattr(obj, 'attribute', None) # returns 'attribute'
getattr(obj, 'other_attribute', None) # returns None
Note that hasattr
and getattr
will only work for attributes that are defined on the object itself, or on its class or any of its superclasses. They will not work for attributes that are stored in the object's __dict__
attribute, unless the attribute is defined in the class's __slots__
attribute.
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