Properties of dictionary:-

• Keys must be unique- Each key of the dictionary must be unique. Since keys are used to identify values in a dictionary, there cannot be duplicate keys in a dictionary.

e.g.,

a={'1':'python','2':'Java','1':'C++'}
print(a)
a.get('1')

As you can see with the above example, the value python is not get stored in the dictionary as it takes the value C++ as it comes first in the alphabetical order.

• Dictionaries are mutable that is we can change the value of any key and add and delete the elements from the dictionary.

• Sequence operations are not applied on dictionaries such as slicing, concatenation, etc.

• The objects or values stored in a dictionary can basically be anything, but keys can only be immutable type-objects e.g., strings, tuples, integers, etc.

These are the properties of dictionary.