setattr¶

Description¶

Called when an attribute assignment is attempted.

Syntax¶

object. __setattr__(self, name, value)

self: Required. Instance of the class, passed automatically on call.
name: Required. The name of the attribute.
value: Required. The value we want to assign to the attribute.

Return Value¶

#TODO

Time Complexity¶

#TODO

Remarks¶

This method is called instead of the normal mechanism (i.e. store the value in the instance dictionary).

If __setattr__() wants to assign to an instance attribute, it should not simply execute self.name = value — this would cause a recursive call to itself.

Instead, it should insert the value in the dictionary of instance attributes, e.g., self.__dict__[name] = value.

For new-style classes, rather than accessing the instance dictionary, it should call the base class method with the same name, for example,

>>> object.__setattr__(self, name, value).

Example¶

>>> # this example uses __setattr__ to dynamically change attribute value to uppercase
>>> class Frob:
...     def __setattr__(self, name, value):
...         self.__dict__[name] = value.upper()
...
>>> f = Frob()
>>> f.bamf = "bamf"
>>> f.bamf
'BAMF'

__setattr__¶