What inheritable methodological action must be performed for a class instance to become a valid key in a data structure like a dictionary?

For a class instance to be a valid key in a Python dictionary, it must be hashable. To achieve this, you need to implement the __hash__() and __eq__() methods.

• The __hash__() method should return an integer value used for quick key lookup.
• The __eq__() method should define the logic for comparing objects for equality.

It is important that objects considered equal (__eq__ returns True) have the same hash (__hash__).

Example:

class MyKey:
    def __init__(self, id):
        self.id = id

    def __eq__(self, other):
        if isinstance(other, MyKey):
            return self.id == other.id
        return False

    def __hash__(self):
        return hash(self.id)

# Usage
my_dict = {}
key = MyKey(10)
my_dict[key] = "value"
print(my_dict[MyKey(10)])  # Will output "value"