w3resource

Python: Retrieve the value of the nested key indicated by the given selector list from a dictionary or list

Python dictionary: Exercise-71 with Solution

Write a Python program to retrieve the value of the nested key indicated by the given selector list from a dictionary or list.

Sample Solution:

Python Code:

from functools import reduce 
from operator import getitem
def test(d, selectors):
  return reduce(getitem, selectors, d) 
users = {
  'Carla ': {
    'name': {
      'first': 'Carla ',
      'last': 'Russell' 
    },
    'postIds': [1, 2, 3, 4, 5]
  }
}
print(test(users, ['Carla ', 'name', 'last']))
print(test(users, ['Carla ', 'postIds', 1]))

Sample Output:

Russell
2

Flowchart:

Flowchart: Retrieve the value of the nested key indicated by the given selector list from a dictionary or list.

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: Write a Python program to map the values of a given list to a dictionary using a function, where the key-value pairs consist of the original value as the key and the result of the function as the value.
Next: Write a Python program to invert a dictionary with unique hashable values.

What is the difficulty level of this exercise?

Test your Programming skills with w3resource's quiz.



Python: Tips of the Day

Decapitalizes the first letter of a string:

Example:

def tips_decapitalize(s, upper_rest=False):
  return s[:1].lower() + (s[1:].upper() if upper_rest else s[1:])
print(tips_decapitalize('PythonTips'))
print(tips_decapitalize('PythonTips', True)) 

Output:

pythonTips
pYTHONTIPS