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Python: Sort a list of nested dictionaries

Python List: Exercise - 50 with Solution

Write a Python program to sort a list of nested dictionaries.

Python: Sort a list of nested dictionaries

Sample Solution:-

Python Code:

my_list = [{'key': {'subkey': 1}}, {'key': {'subkey': 10}}, {'key': {'subkey': 5}}]
print("Original List: ")
print(my_list)
my_list.sort(key=lambda e: e['key']['subkey'], reverse=True)
print("Sorted List: ")
print(my_list)

Sample Output: 

Original List:                                                                                                
[{'key': {'subkey': 1}}, {'key': {'subkey': 10}}, {'key': {'subkey': 5}}]                                     
Sorted List:                                                                                                  
[{'key': {'subkey': 10}}, {'key': {'subkey': 5}}, {'key': {'subkey': 1}}]

Flowchart:

Flowchart: Sort a list of nested dictionaries

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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