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Python: Invert a dictionary with unique hashable values

Python dictionary: Exercise-72 with Solution

Write a Python program to invert a dictionary with unique hashable values.

  • Use dictionary.items() in combination with a list comprehension to create a new dictionary with the values and keys inverted.

Sample Solution:

Python Code:

def test(students):
  return { value: key for key, value in students.items() }
 
students = {
  'Theodore': 10,
  'Mathew': 11,
  'Roxanne': 9,
}
print(test(students))

Sample Output: 

{10: 'Theodore', 11: 'Mathew', 9: 'Roxanne'}

Flowchart:

Flowchart: Invert a dictionary with unique hashable values.

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Previous: Write a Python program to retrieve the value of the nested key indicated by the given selector list from a dictionary or list.
Next: Write a Python program to convert a list of dictionaries into a list of values corresponding to the specified key.

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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