Sanskriti Roy Presentation of python (3).pptx

Python presentation

1. Name- Sanskriti Ray Branch-CSE Roll-2024-CSE-006

2. Dictionaries in python

3. Topics to be covered Introduction to dictionaries Creating dictionaries Modifying dictionaries Common dictionary methods Nested dictionaries

4. Introduction to dictionaries Dictionaries are used to store data types in key:value pairs. Keys must be unique(can’t have duplicates). Values can be of any data type( string,tuple,Int,list,dictionary ). Dictionaries are unordered, mutable(changeable)and don’t allow duplicate keys.

5. Creating dictionary Examples: my_dict ={‘name’ : Sanskriti Ray’ ‘branch’ : ‘CSE’ ‘semester’ : ‘3 rd ’} empty_dict ={}

6. Modifying dictionaries Add new item : my_dict[‘country’]=‘India’ Update value : my_dict[‘age’]=16 Remove item : del my_dict[‘city’] Pop() method remove and returns value

7. Common dictionary methods my_dict.keys () #returns all keys. my_dict.values () #returns all values. my_dict.items () #returns key-value pairs. my_dict.update () #merges another dictionaries. my_dict.clear () # remove all items.

8. Nested dictionaries my_dict{ “name” : “ sanskriti ” “Subjects” : { “python”=56 “java”=49 “C”=58 } }