Question

how do we use a dictionary

Answer 1

In a dictionary, you store key-value pairs. The key must be unique. Typically hashing is used to find elements quickly based on the keys.

All dictionaries work quite the same. You can check out Microsoft Documentation on C# Dictionary for details and examples here.

Answer 2

In Python, a dictionary can be created by placing a sequence of elements within curly {} braces, separated by ‘comma’. Dictionary holds pairs of values, one being the Key and the other corresponding pair element being its Key:value. Values in a dictionary can be of any data type and can be duplicated, whereas keys can’t be repeated and must be immutable. 

Note – Dictionary keys are case sensitive, the same name but different cases of Key will be treated distinctly.