w3resource

Python: Extract a list of values from a given list of dictionaries

Python dictionary: Exercise-52 with Solution

Write a Python program to extract a list of values from a given list of dictionaries.

Sample Solution:

Python Code:

def test(lst, marks):
    result = [d[marks] for d in lst if marks in d]
 
    return result

marks = [{'Math': 90, 'Science': 92}, 
         {'Math': 89, 'Science': 94}, 
         {'Math': 92, 'Science': 88}]

print("\nOriginal Dictionary:")
print(marks)
subj = "Science"
print("\nExtract a list of values from said list of dictionaries where subject =",subj)
print(test(marks, subj))

print("\nOriginal Dictionary:")
print(marks)
subj = "Math"
print("\nExtract a list of values from said list of dictionaries where subject =",subj)
print(test(marks, subj))

Sample Output:

Original Dictionary:
[{'Math': 90, 'Science': 92}, {'Math': 89, 'Science': 94}, {'Math': 92, 'Science': 88}]

Extract a list of values from said list of dictionaries where subject = Science
[92, 94, 88]

Original Dictionary:
[{'Math': 90, 'Science': 92}, {'Math': 89, 'Science': 94}, {'Math': 92, 'Science': 88}]

Extract a list of values from said list of dictionaries where subject = Math
[90, 89, 92]

Pictorial Presentation:

Python Dictionary: Extract a list of values from a given list of dictionaries.

Flowchart:

Flowchart: Extract a list of values from a given list of dictionaries.

Visualize Python code execution:

The following tool visualize what the computer is doing step-by-step as it executes the said program:


Python Code Editor:

Have another way to solve this solution? Contribute your code (and comments) through Disqus.

Previous: A Python Dictionary contains List as value. Write a Python program to update the list values in the said dictionary.
Next: Write a Python program to find the length of a given dictionary values.

What is the difficulty level of this exercise?

Test your Python skills with w3resource's quiz



Python: Tips of the Day

Free up Memory:

  • Manual garbage collection can be performed on timely or event based mechanism.
import gc
collected_objects = gc.collect()