Usage of the Underscore (_) in Python

Do you know all the usage of the Underscore in Python?

This is a continued story of my previous post Star in Python.

In this article, we will know about the usage of underscore in Python.

1. As a placeholder of variable

If you do not use a variable then you can name it as underscore.

>>> my_dict = {'a': 1, 'b': 2}
>>> for k, _ in my_dict.items():
...    print(f"The keys are: {k}")
The keys are: a
The keys are: b

Here we have not used the values of the dictionary therefore no need to assign that to a named variable, underscore we have used to denote the values of the dictionary. This is a best practice.
Although this is not such an excellent example, hope you got the point.

2. Underscore in object-oriented programming

Underscore plays a significant part in OOP.

Private method

To define a private method _ prefix is used.

>>> class myClass:
...    def _my_private_method(self):
...    pass

Protected method

>>> class myClass:
...    def…