In this section, we will learn what the __str__ method is and how to use it in Python.
What is __str__ Method in Python?
Let’s say you have a custom class and created an object from it.
Now that object is involved in an operation where a string type of value is needed! For example, the object is passed as the argument of the `print()` function! How should Python know which value to take from our object and pass that into the operation?
This is where the `__str__` method comes handy.
This method can be overridden in a class and it will return a string value as a result of calling it.
So if we override this method in a class, then python will call it to take its string value automatically when an object of that class type is involved in an operation where a string value is required.
Python __str__ Method Syntax
Python __str__ Method Parameters
The method takes one argument, and that is filled automatically by the Python execution engine itself.
Python __str__ Method Return Value
The return value of this method is a string value that will be used in an operation where a string is needed.
Example: using python __str__ method
class Parent: def __str__(self): return "The name of this class is Parent" par = Parent() print(par)
The name of this class is Parent
Here we’ve passed the `par` object as the argument of the `print()` function and because this function needs a string value, then the execution engine called `__str__` method of the `par` object automatically and used the string value we’ve set as the return value of this method and sent it to the output stream.