How can you get or modify the value of an object's attribute in Python?

In Python, the value of an object's attribute can be accessed and modified in several ways:

• Using dot notation:

  obj.attribute  # get
  obj.attribute = value  # set
  

• Using the getattr and setattr functions:

  value = getattr(obj, 'attribute')
  setattr(obj, 'attribute', new_value)
  

• Directly working with the object's __dict__ (if it exists):

  obj.__dict__['attribute'] = new_value
  

These methods allow flexible management of object attributes at runtime.