Python: Split a given dictionary of lists into list of dictionaries using map function

Last update on April 22 2025 12:52:45 (UTC/GMT +8 hours)

15. Dict to List Map

Write a Python program to split a given dictionary of lists into list of dictionaries using the map function.

Sample Solution:

Python Code:

# Define a function named 'list_of_dicts' that takes a dictionary of lists as input
def list_of_dicts(marks):
    # Use a list comprehension to create a list of tuples, where each tuple represents a key-value pair from the input dictionary
    # Use the 'zip' function to transpose the list of tuples, creating tuples with values from the same position in each tuple
    # Use another list comprehension to convert each tuple into a dictionary
    # Use the 'map' function to apply the 'dict' constructor to each tuple, resulting in a map object of dictionaries
    # Convert the map object to a list and return the result
    result = map(dict, zip(*[[(key, val) for val in value] for key, value in marks.items()]))
    return list(result)

# Define a dictionary named 'marks' with keys representing subjects and values representing lists of marks
marks = {'Science': [88, 89, 62, 95], 'Language': [77, 78, 84, 80]}

# Print the original dictionary of lists
print("Original dictionary of lists:")
print(marks)

# Print a newline for better readability
print("\n")

# Print a message indicating the operation to be performed
print("Split said dictionary of lists into list of dictionaries:")

# Print the result of calling the 'list_of_dicts' function with the 'marks' dictionary
print(list_of_dicts(marks))

Sample Output:

Original dictionary of lists:
{'Science': [88, 89, 62, 95], 'Language': [77, 78, 84, 80]}

Split said dictionary of lists into list of dictionaries:
[{'Science': 88, 'Language': 77}, {'Science': 89, 'Language': 78}, {'Science': 62, 'Language': 84}, {'Science': 95, 'Language': 80}]

For more Practice: Solve these Related Problems:

Write a Python program to convert a dictionary of lists into a list of dictionaries by mapping over the zipped values.
Write a Python program to use map to iterate over a dictionary of lists and form individual dictionaries for each index.
Write a Python program to apply map with a lambda that reconstructs dictionaries from a dictionary of lists.
Write a Python program to convert a dictionary of lists into a list of dictionaries while preserving keys, using map.

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Python Code Editor:

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