Dictionary in Python Class 11 Notes | Tuples and Dictionaries

  

What is Dictionary

• Dictionaries are unordered collection of items falls under mapping.
• Stores data in form of key:value pair called item.
• Key is separated from its value by colon ‘:’ and items are separated by comma.
• All items of dictionaries are enclosed in curly bracket ‘{}’.
• The keys in the dictionary must be unique and should be of immutable data type.
• The value can be repeated and of any data type.

Creating a Dictionary

Accessing items in a Dictionary

• Items of dictionary are accessed using keys.
• Each key of dictionary serve as index and maps to a value.
• If key is not present in dictionary, then we get KeyError.

Examples

Dictionary is Mutable

Yes, Dictionary is Mutable as its content can be changed after it has been created.

Adding a new item in Dictionary

Modifying an existing Item in Dictionary

Traversing a dictionary

Dictionary methods and built in functions