olymorphism in Python is achieved through: Function overloadingOperator overloadingBoth function overloading and operator overloadingMethod overloading and method overriding

Polymorphism in Python is achieved through both operator overloading and method overriding.

Here's a step-by-step explanation:

1. Operator Overloading: Python allows different operators to have different implementations based on their arguments. This is called operator overloading. For example, the '+' operator will perform arithmetic addition on two numbers, merge two lists, or concatenate two strings. This feature in Python that allows the same operator to have different meaning according to the context is called operator overloading.

2. Method Overriding: Method overriding is an ability of any object-oriented programming language that allows a subclass or child class to provide a specific implementation of a method that is already provided by one of its super-classes or parent classes. When a method in a subclass has the same name, same parameters or signature and same return type(or sub-type) as a method in its super-class, then the method in the subclass is said to override the method in the super-class.

However, it's important to note that Python does not support method overloading like other languages (Java, C++, etc.). We may overload the methods but can only use the latest defined method. But we can define methods with default values to achieve similar functionality.

So, in Python, polymorphism is achieved through operator overloading and method overriding, but not function overloading.