/  Technology   /  Intersecting two dictionaries ## Intersecting two dictionaries

Dictionary is an unordered collection of data in the form of key-value pairs separated by commas inside curly brackets. Dictionaries are indexed by keys. They are generally optimized to retrieve values when the key is known. Values (definitions) are mapped to a specific key (words) similar to that of a dictionary in the real world.

Now our task is intersecting two dictionaries using their keys. We can achieve this in two ways

• Dictionary Comprehension
• & Operator

#### Using Dictionary Comprehension:

Now, let’s take an example of two dictionaries x and y with the following keys and values. We now take an iterator i which is the key of x and check whether the i(key) in x exists in y as well by running a for loop

` { i : x[i] for i in x if i in y } `

If it finds one, the common key and its value are pushed inside a new dictionary named z.

`z = { i : x[i] for i in x if i in y } ` We can see the common key:value pair {‘a’: ‘one’} has been printed when we tried to print z.

#### Using &(AND) Operator:

Let’s consider the same example of two dictionaries x and y. We now try to convert the two dictionaries into a list using the items() function and relate them using the &(AND) Operator.

`x.items() & y.items()`

After this, we use the dict() function to convert the common key-value pairs into a dictionary and store them in z.

`z = dict( x.items() & y.items() )` 