* Python dictionaries check for equality and compare the hash value to determine if two keys are the same.

* Immutable objects with same value always have a same hash in Python.

>>> 5 == 5.0

True

**Note:** Objects with different values may also have same hash (known as hash collision).

* When the statement `some_dict[5] = "Python"` is executed, the existing value "JavaScript" is overwritten with "Python" because Python recongnizes `5` and `5.0` as the same keys of the dictionary `some_dict`.