Dictionary in Python

In this tutorial, we will learn about the Dictionary in Python. Its types, and how to use them with the help of examples.

List, tupple ,set data types are use to represent individual objects as a single entity. To store the group of objects as a key-value pairs use dictionary. Declare the dictionary data within the curly braces, each key separate with value by using : (colon) & each element is separate with comma. A dictionary is a data type similar to arrays, but works with keys & values instead of indexes. The keys must be unique keys but values can be duplicate. The values in the dictionary can be of any type while the keys must be immutable like numbers, tuples or strings. Dictionary keys are case sensitive- Same key name but with the different case are treat as different keys in Python dictionaries.

Note: As of Python version 3.7, dictionaries are ordered. In Python 3.6 and earlier, dictionaries are unordered.

Create a Dictionaries in Python

subject = {"English": "JRR Tolkien", "Science": "Stan Lee", "History": "Edgar Allan Poe", 
           "Math": "Roald Dahl", "Hindi": "Rabindranath Tagore"}
print(subject)

A Create a Dictionary in Python

Let’s run the code

In the above example, we have created a dictionary named subject. Here

• Keys are “English”, “Science”, “History”, “Math”, “Hindi”
• Value are “JRR Tolkien”, “Stan Lee”, “Edgar Allan Poe”, “Roald Dahl”, “Rabindranath Tagore”

Accessing Elements from Dictionaries in Python

roll = {1: "Roshan", 2: "Soshan", 3: "Rohit", 4: "Mohit", 5: "Shivam", 6: "Shri",}

print(roll[1]) 
print(roll[3])
print(roll[5])
print(roll[6])

The Accessing Elements from Dictionary in Python

Let’s run the code

Method of Dictionary

A Example of Dictionaries Method

# clear() method   
dict1 = {1: "CSS", 2: "Html", 3: "JAVA", 4: "Python", 5: "c"}    
dict1.clear()  
print(dict1)  

# copy() method  
dict2 = {1: "CSS", 2: "Html", 3: "JAVA", 4: "Python", 5: "c"}     
demo = dict2.copy()  
print(demo) 

# pop() method   
dict3 = {1: "CSS", 2: "Html", 3: "JAVA", 4: "Python", 5: "c"}    
lo = dict3.copy()  
x = lo.pop(2)  
print(x) 

# keys() method 
dict4 = {1: "CSS", 2: "Html", 3: "JAVA", 4: "Python", 5: "c"}
print(lo.keys()) 

# popitem() method  
dict5 ={1: "CSS", 2: "Html", 3: "JAVA", 4: "Python", 5: "c"}
dict_demo.popitem()  
print(dict_demo)

Example of Dictionaries Method

Nested Dictionaries

A dictionary within another dictionary is know as dictionary or nesting of a dictionary.

Dict = {1: 'Basic', 2: 'Engineer',
        3: {'A': 'Hello', 'B': 'Student', 'C': 'Python'}}
  
print(Dict)

A Nested Dictionary

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