Dictionaries in Python. – DEV Community 👩‍💻👨‍💻

1. What are dictionaries in Python

• Dictionary is among the knowledge varieties which is used to retailer knowledge within the pairs of key : knowledge.

• It’s ordered.

• It’s mutable.

• Keys shouldn’t be duplicated however knowledge could be identical.

• Dictionaries are written with curly brackets.

2. Making a Dictionary

1. It’s encloses in curly {} braces.
2. Separated by a comma (,).
3. It holds values in pairs of keys corresponding with knowledge.
4. Keys can’t be repeated and are immutable.
5. Information could be of any Datatype.

2.1 Instance

dict = {1: 'A', 2: 'B', 3: 'C'}
print(dict)

OUTPUT
{1: ‘A’, 2: ‘B’, 3: ‘C’}

3. Accessing knowledge of a dictionary
We are able to entry the information by their respective keys.
3.1 Syntax

dict = {1: 'A', 2: 'B', 3: 'C'}
print(dict[1])

OUTPUT
A
4. Including components to a dictionary
Syntax:

dict = {1: 'A', 2: 'B', 3: 'C'}
print("outdated dictionary")
print(dict)
new_dict=dict[4]='a'
print("Up to date dictionary")
print(dict)

OUTPUT:
outdated dictionary
{1: ‘A’, 2: ‘B’, 3: ‘C’}
Up to date dictionary
{1: ‘A’, 2: ‘B’, 3: ‘C’, 4: ‘a’}