getter/setter must have 1 or 2 arguments respectively

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Metadata

ID: python-best-practices/get-set-arguments

Language: Python

Severity: Warning

Category: Best Practices

Description

Ensure that getter and setter have the right number of parameters:

getters must have exactly one parameter (the instance we are reading from)
setters must have exactly two parameters (the instance we are updating and the associated value)

Learn More

Python documentation - property

Non-Compliant Code Examples

class Foo:
   @property
   def get_my_attribute(self, foo):  # getter should have only one argument
      return self.my_attribute
   
   @attr.setter
   def set_attr(self, v, bar):  # setter should have only two arguments
      self._attr = v

   @attr.deleter
   def del_attr(self, foo):  # deleter should have only one argument
      del self._attr

Compliant Code Examples

class Foo:
   def get_my_attribute(self):
      return self.my_attribute
   
   def get_my_attribute(self, foo): # Not a property or attr, valid
      return self.my_attribute

   @property
   def get_my_attribute(self):
      return self.my_attribute

   def set_my_attribute(self, v):
      self.my_attribute = v

   @attr.setter
   def set_attr(self, v):
      self._attr = v

   @attr.deleter
   def del_attr(self,):
      return self._attr