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Python: Update the list values within a given dictionary

Python dictionary: Exercise-51 with Solution

A Python Dictionary contains List as value. Write a Python program to update the list values in the said dictionary.

Sample Solution:

Python Code:

def test(dictionary):
    dictionary['Math'] = [x+1 for x in dictionary['Math']]
    dictionary['Physics'] = [x-2 for x in dictionary['Physics']]
    return dictionary

dictionary = { 
               'Math' : [88, 89, 90], 
               'Physics' : [92, 94, 89],
               'Chemistry' : [90, 87, 93]
             }
print("\nOriginal Dictionary:")
print(dictionary)
print("\nUpdate the list values of the said dictionary:")
print(test(dictionary))

Sample Output:

Original Dictionary:
{'Math': [88, 89, 90], 'Physics': [92, 94, 89], 'Chemistry': [90, 87, 93]}

Update the list values of the said dictionary:
{'Math': [89, 90, 91], 'Physics': [90, 92, 87], 'Chemistry': [90, 87, 93]}

Pictorial Presentation:

Python Dictionary: Update the list values within a given dictionary.

Flowchart:

Flowchart: Update the list values within a given dictionary.

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Previous: A Python Dictionary contains List as value. Write a Python program to clear the list values in the said dictionary.
Next: Write a Python program to extract a list of values from a given list of 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