Python: Remove duplicates from Dictionary

Last update on June 28 2025 12:40:10 (UTC/GMT +8 hours)

17. Remove Duplicates from the Dictionary

Write a Python program to remove duplicates from the dictionary.

Visual Presentation:

Sample Solution:

Python Code:

# Create a nested dictionary 'student_data' containing information about students with unique IDs.
student_data = {
    'id1': {
        'name': ['Sara'],
        'class': ['V'],
        'subject_integration': ['english, math, science']
    },
    'id2': {
        'name': ['David'],
        'class': ['V'],
        'subject_integration': ['english, math, science']
    },
    'id3': {
        'name': ['Sara'],
        'class': ['V'],
        'subject_integration': ['english, math, science']
    },
    'id4': {
        'name': ['Surya'],
        'class': ['V'],
        'subject_integration': ['english, math, science']
    }
}

# Create an empty dictionary 'result' to store unique student records.
result = {}

# Iterate through the key-value pairs in the 'student_data' dictionary using a for loop.
for key, value in student_data.items():
    # Check if the current 'value' (student record) is not already in the 'result' dictionary.
    if value not in result.values():
        # If the 'value' is not already in 'result', add it to 'result' with its corresponding 'key'.
        result[key] = value

# Print the 'result' dictionary containing unique student records.
print(result) 

Sample Output:

{'id2': {'subject_integration': ['english, math, science'], 'class': ['V'], 'name': ['David']}, 'id4': {'subje
ct_integration': ['english, math, science'], 'class': ['V'], 'name': ['Surya']}, 'id1': {'subject_integration'
: ['english, math, science'], 'class': ['V'], 'name': ['Sara']}}  

For more Practice: Solve these Related Problems:

• Write a Python program to remove duplicate key-value pairs from a dictionary where values are lists by merging duplicates.
• Write a Python program to filter a dictionary so that each value appears only once, keeping the first occurrence.
• Write a Python program to implement a function that removes duplicate items from a dictionary and returns a new dictionary with unique values.
• Write a Python program to consolidate duplicate keys in a dictionary by summing their values.

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