Python: Extract values from a given dictionaries and create a list of lists from those values

Last update on April 21 2025 13:00:43 (UTC/GMT +8 hours)

62. Extract Values from Dictionary and Create a List of Lists

Write a Python program to extract values from a given dictionary and create a list of lists from those values.

Visual Presentation:

Sample Solution:

Python Code:

# Define a function 'test' that takes a list of dictionaries 'dictt' and a tuple of 'keys' as arguments.
def test(dictt, keys):
    # Use a list comprehension to extract values from the dictionaries for the specified 'keys' and create a list of lists.
    return [list(d[k] for k in keys) for d in dictt]

# Create a list of dictionaries 'students' where each dictionary represents student information.
students = [
    {'student_id': 1, 'name': 'Jean Castro', 'class': 'V'},
    {'student_id': 2, 'name': 'Lula Powell', 'class': 'V'},
    {'student_id': 3, 'name': 'Brian Howell', 'class': 'VI'},
    {'student_id': 4, 'name': 'Lynne Foster', 'class': 'VI'},
    {'student_id': 5, 'name': 'Zachary Simon', 'class': 'VII'}
]

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

# Print a message indicating the purpose and demonstrate the 'test' function's usage for different sets of 'keys'.
print("\nExtract values from the said dictionaries and create a list of lists using those values:")
print("\n", test(students, ('student_id', 'name', 'class')))
print("\n", test(students, ('student_id', 'name')))
print("\n", test(students, ('name', 'class')))

Sample Output:

Original Dictionary:
[{'student_id': 1, 'name': 'Jean Castro', 'class': 'V'}, {'student_id': 2, 'name': 'Lula Powell', 'class': 'V'}, {'student_id': 3, 'name': 'Brian Howell', 'class': 'VI'}, {'student_id': 4, 'name': 'Lynne Foster', 'class': 'VI'}, {'student_id': 5, 'name': 'Zachary Simon', 'class': 'VII'}]

Extract values from the said dictionarie and create a list of lists using those values:

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

 [[1, 'Jean Castro'], [2, 'Lula Powell'], [3, 'Brian Howell'], [4, 'Lynne Foster'], [5, 'Zachary Simon']]

 [['Jean Castro', 'V'], ['Lula Powell', 'V'], ['Brian Howell', 'VI'], ['Lynne Foster', 'VI'], ['Zachary Simon', 'VII']]

Flowchart:

For more Practice: Solve these Related Problems:

• Write a Python program to extract the values from a dictionary and return them as a list of lists using list().
• Write a Python program to iterate over a dictionary and collect its values into a nested list structure.
• Write a Python program to use dictionary.values() and convert the resulting view into a list of lists.
• Write a Python program to implement a function that returns all dictionary values as separate lists within one list.

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• Python Data Types Dictionsry Exercises Home ↩
• Python Exercises Home ↩

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