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Python: Merge two Python dictionaries

Python dictionary: Exercise-8 with Solution

Write a Python script to merge two Python dictionaries.

Sample Solution-1:

Python Code:

d1 = {'a': 100, 'b': 200}
d2 = {'x': 300, 'y': 200}
d = d1.copy()
d.update(d2)
print(d)

Sample Output:

{'x': 300, 'y': 200, 'a': 100, 'b': 200}

Visualize Python code execution:

The following tool visualize what the computer is doing step-by-step as it executes the said program:


Sample Solution-2:

Create a new dict and loop over dicts, using dictionary.update() to add the key-value pairs from each one to the result.

Python Code:

def merge_dictionaries(*dicts):
  result = dict()
  for d in dicts:
    result.update(d)
  return result
students1 = {
  'Theodore': 10,
  'Mathew': 11,
}
students2 = {
  'Roxanne': 9
}
print("Original dictionaries:")
print(students1)
print(students2)
print("\nMerge dictionaries:")
print(merge_dictionaries(students1, students2))

Sample Output:

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

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

Flowchart:

Flowchart: Merge two Python dictionaries

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:

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Previous: Write a Python script to print a dictionary where the keys are numbers between 1 and 15 (both included) and the values are square of keys.
Next: Write a Python program to iterate over dictionaries using for loops.

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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