Modify or delete dictionary entry in Python

Dictionaries are powerful data structures in Python that allow for efficient and fast lookups of key-value pairs. However, there may be times when you need to change or delete certain entries in a dictionary. Whether you're a beginner or an experienced Python programmer, this tutorial will guide you through the different ways you can modify or delete dictionary entries in Python. 

Modifying the values of the key-value pairs

• The basic syntax of modifying value of a key-value pair of the dictionary is :  d[key] = new_value 
• Code Sample : 

quantities = {
    "apple": 10,
    "oranges": 20,
    "banana": 25,
    "Mangoes": 35
}

print("Value os dictionary :")
print(quantities)
print()

quantities["apple"] = 5
print("Value os dictionary :")
print(quantities)

# Output
# Value os dictionary :
# {'apple': 10, 'oranges': 20, 'banana': 25, 'Mangoes': 35}

# Value os dictionary :
# {'apple': 5, 'oranges': 20, 'banana': 25, 'Mangoes': 35}

Deleting a key-value pair

• We can use the  del  keyword to delete an entry of the dictionary.
• The basic syntax of deleting a key-value pair of the dictionary is :  del d[key] 

quantities = {
    "apple": 10,
    "oranges": 20,
    "banana": 25,
    "Mangoes": 35
}

print("Value os dictionary :")
print(quantities)
print()

del quantities["apple"]
print("Value os dictionary :")
print(quantities)

# Output
# Value os dictionary :
# {'apple': 10, 'oranges': 20, 'banana': 25, 'Mangoes': 35}

# Value os dictionary :
# {'oranges': 20, 'banana': 25, 'Mangoes': 35}