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

Last update on May 28 2022 13:24:02 (UTC/GMT +8 hours)

Python dictionary: Exercise-62 with Solution

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

Sample Solution:

Python Code:

def test(dictt,keys):
    return [list(d[k] for k in keys) for d in dictt] 

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("\nOriginal Dictionary:")
print(students)
print("\nExtract values from the said dictionarie 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']]

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

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Previous: Write a Python program to count the frequency in a given dictionary.
Next: Write a Python program to convert a given list of lists to a dictionary.

Python: Tips of the Day

Find current directory and file's directory:

To get the full path to the directory a Python file is contained in, write this in that file:

import os dir_path = os.path.dirname(os.path.realpath(__file__))

(Note that the incantation above won't work if you've already used os.chdir() to change your current working directory, since the value of the __file__ constant is relative to the current working directory and is not changed by an os.chdir() call.)

To get the current working directory use

import os cwd = os.getcwd()

Documentation references for the modules, constants and functions used above:

The os and os.path modules.

The __file__ constant

os.path.realpath(path) (returns "the canonical path of the specified filename, eliminating any symbolic links encountered in the path")

os.path.dirname(path) (returns "the directory name of pathname path")

os.getcwd() (returns "a string representing the current working directory")

os.chdir(path) ("change the current working directory to path")

Ref: https://bit.ly/3fy0R6m