What Is Def __ Str __( Self In Python?

What is def __ str __( self in Python?

Python __repr__() function returns the object representation.

It could be any valid python expression such as tuple, dictionary, string etc.

This method is called when repr() function is invoked on the object, in that case, __repr__() function must return a String otherwise error will be thrown..

What is Self in Django?

Django uses metaclasses to create the actual class based on the class definition your provide. … self ) allows the metaclass to inspect the class attributes without having to first instantiate it.

What is __ repr __ In Python class?

__str__ is the output that is supposed to be human readable: __repr__ is supposed to be a representation readable for the Python interpreter (i.e. feeding the string to the interpreter should recreate the object). If an object does not have a __str__ method, however, __repr__ is used instead.

What is slug in Django?

Slug is a newspaper term. A slug is a short label for something, containing only letters, numbers, underscores or hyphens. They’re generally used in URLs. ( as in Django docs) A slug field in Django is used to store and generate valid URLs for your dynamically created web pages.

What are Django models?

A model is the single, definitive source of information about your data. It contains the essential fields and behaviors of the data you’re storing. Generally, each model maps to a single database table. … Each model is a Python class that subclasses django. db.

What is def __ str __( self in Django?

def str(self): is a python method which is called when we use print/str to convert object into a string. … When we use it in models.py file, go to admin interface, it creates object as “News”, otherwise entry will be shown as main.

What does the __ str __ method do?

The __str__ method is useful for a string representation of the object, either when someone codes in str(your_object) , or even when someone might do print(your_object) . … Just typing the object out will give you the __repr__ , or “representation” of the object.

What is __ add __ in Python?

Modifying the __add__ method of a Python Class Learn how you should modify the __add__ method of a Python class to be able to add two instances of a custom object. … We can define the __add__ method to return a Day instance with the total number of visits and contacts: class Day(object):

What does str () do in Python?

The str() function converts values to a string form so they can be combined with other strings. For numbers, the standard operators, +, /, * work in the usual way. There is no ++ operator, but +=, -=, etc. work.

Why do we use __ in Python?

The use of double underscore ( __ ) in front of a name (specifically a method name) is not a convention; it has a specific meaning to the interpreter. Python mangles these names and it is used to avoid name clashes with names defined by subclasses. … This is the name mangling that the Python interpreter applies.

What is Django mixin?

A Mixin is a special kind of inheritance in Python (and other object-oriented languages) and it’s starting to get a big rise in Django / Web Application Development. … You can use a Mixin to allow classes in Python to share methods between any class that inherits from that Mixin.