What methods can be used to verify that an object in Python can be used as an element of a hash table?

To check if an object can be used as an element of a hash table (for example, as a key in a dictionary or an element of a set) in Python, you need to ensure that the object:

1. Is hashable — it has a __hash__() method that returns an integer value.
2. Is comparable for equality — it has a __eq__() method.

If the object is mutable or does not implement these methods, it cannot be a key in a dictionary.

Example check:

try:
    hash(obj)
    # Additionally, you can check if obj.__eq__ is defined
    can_be_key = True
except TypeError:
    can_be_key = False

You can also check the object's type against built-in immutable types (int, str, tuple, etc.), which are hashable by default.