Python: Convert a given list of lists to a dictionary

Last update on June 28 2025 12:41:12 (UTC/GMT +8 hours)

63. Convert List of Lists to a Dictionary

Write a Python program to convert a given list of lists to a dictionary.

Visual Presentation:

Sample Solution:

Python Code:

# Define a function 'test' that takes a list of lists 'lst' as an argument.
def test(lst):
    # Use a dictionary comprehension to convert each list in 'lst' into a dictionary,
    # where the first element is the key, and the rest of the elements are values.
    result = {item[0]: item[1:] for item in lst}
    return result

# Create a list of lists 'students' where each inner list represents student information.
students = [
    [1, 'Jean Castro', 'V'],
    [2, 'Lula Powell', 'V'],
    [3, 'Brian Howell', 'VI'],
    [4, 'Lynne Foster', 'VI'],
    [5, 'Zachary Simon', 'VII']
]

# Print a message indicating the start of the code section and display the original list of lists.
print("\nOriginal list of lists:")
print(students)

# Print a message indicating the purpose and demonstrate the 'test' function's usage to convert the list of lists to a dictionary.
print("\nConvert the said list of lists to a dictionary:")
print(test(students)) 

Sample Output:

Original list of lists:
[[1, 'Jean Castro', 'V'], [2, 'Lula Powell', 'V'], [3, 'Brian Howell', 'VI'], [4, 'Lynne Foster', 'VI'], [5, 'Zachary Simon', 'VII']]

Convert the said list of lists to a dictionary:
{1: ['Jean Castro', 'V'], 2: ['Lula Powell', 'V'], 3: ['Brian Howell', 'VI'], 4: ['Lynne Foster', 'VI'], 5: ['Zachary Simon', 'VII']}

Flowchart:

For more Practice: Solve these Related Problems:

• Write a Python program to convert a list of two-element lists into a dictionary using dict().
• Write a Python program to iterate over a list of lists and construct a dictionary where the first element is the key and the second is the value.
• Write a Python program to use dictionary comprehension to transform a list of lists into a dictionary.
• Write a Python program to implement a function that creates a dictionary from a list of lists, handling duplicate keys by storing values in a list.

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