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Python: Convert more than one list to nested dictionary

Python dictionary: Exercise-43 with Solution

Write a Python program to convert more than one list to nested dictionary.

Sample Solution:

Python Code:

def nested_dictionary(l1, l2, l3):
     result = [{x: {y: z}} for (x, y, z) in zip(l1, l2, l3)]
     return result

student_id = ["S001", "S002", "S003", "S004"] 
student_name = ["Adina Park", "Leyton Marsh", "Duncan Boyle", "Saim Richards"] 
student_grade = [85, 98, 89, 92]
print("Original strings:")
print(student_id)
print(student_name)
print(student_grade)
print("\nNested dictionary:")
ch='a'
print(nested_dictionary(student_id, student_name, student_grade))

Sample Output:

Original strings:
['S001', 'S002', 'S003', 'S004']
['Adina Park', 'Leyton Marsh', 'Duncan Boyle', 'Saim Richards']
[85, 98, 89, 92]

Nested dictionary:
[{'S001': {'Adina Park': 85}}, {'S002': {'Leyton Marsh': 98}}, {'S003': {'Duncan Boyle': 89}}, {'S004': {'Saim Richards': 92}}]

Pictorial Presentation:

Python Dictionary: Convert more than one list to nested dictionary.

Flowchart:

Flowchart: Convert more than one list to nested dictionary.

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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