Python string methods | Dunder methods

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Python Notes:
In Python, dunder methods are methods that allow instances of a class to interact with the built-in functions and operators of the language. The word “dunder” comes from “double underscore”, because the names of dunder methods start and end with two underscores, for example __str__ or __add__. Typically, dunder methods are not invoked directly by the programmer, making it look like they are called by magic. That is why dunder methods are also referred to as “magic methods” sometimes.1

Why do dunder methods start and end with two underscores?
The two underscores in the beginning and end of the name of a dunder method do not have any special significance. In other words, the fact that the method name starts and ends with two underscores, in and of itself, does nothing special. The two underscores are there just to prevent name collision with other methods implemented by unsuspecting programmers.

Introduction to the Python __str__ method
Let’s start with the Employee class:

In Python, dunder methods are methods that allow instances of a class to interact with the built-in functions and operators of the language. The word “dunder” comes from “double underscore”, because the names of dunder methods start and end with two underscores, for example __str__ or __add__. Typically, dunder methods are not invoked directly by the programmer, making it look like they are called by magic. That is why dunder methods are also referred to as “magic methods” sometimes.1

Why do dunder methods start and end with two underscores?
The two underscores in the beginning and end of the name of a dunder method do not have any special significance. In other words, the fact that the method name starts and ends with two underscores, in and of itself, does nothing special. The two underscores are there just to prevent name collision with other methods implemented by unsuspecting programmers.

Example: class Employee:
def __init__(self, firstName, lastName):
self.firstName = firstName
self.lastName = lastName
def __repr__(self):
return f'Employee("{ self.firstName }","{ self.lastName }")'
def __str__(self):
return f'Employee({ self.firstName },{ self.lastName })'


e = Employee("Bill", "Gates")
print(e)

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