Slots In Python

1. __slots__ In Python 2.7
2. Memory Slots In Python
3. Object Show Slot Machine

Slots

Introduction In Python, each object instance is pre-built with standard functions and attributes. For example, Python uses a dictionary to store the instance attributes of an object. This has many advantages, such as allowing us to add new attributes at run time. However, this convenience comes at a cost. Dictionaries can consume a good deal. Descriptor methods include get , set and delete. And a descriptor is simply a Python object that implements at least one descriptor methods. slots automatically creates a descriptor for each attribute with the implementation of descriptor methods. You can find them in the screenshot. The signal on its own does not perform any action. Instead, it is ‘connected’ to a ‘slot’. The slot can be any callable Python function. In PyQt, connection between a signal and a slot can be achieved in different ways. Following are most commonly used techniques − QtCore.QObject.connect(widget, QtCore.SIGNAL(‘signalname’), slot. A Computer Science portal for geeks. It contains well written, well thought and well explained computer science and programming articles, quizzes and practice/competitive programming/company interview Questions.

Introduction

The attributes of objects are stored in a dictionary '__dict__'. Like any other dictionary, a dictionary used for attribute storage doesn't have a fixed number of elements. In other words,you can add elements to dictionaries after they have been defined, as we have seen in our chapter on dictionaries. This is the reason, why you can dynamically add attributes to objects of classes, you have created.
We recommend to continue with our chapter 'Python3 Slots' of our Python3 tutorial. It's compatible with version 2.x anyway.

__slots__ In Python 2.7

Memory Slots In Python

Object Show Slot Machine