w3resource

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:

Have another way to solve this solution? Contribute your code (and comments) through Disqus.

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.

What is the difficulty level of this exercise?

Test your Python skills with w3resource's quiz



Python: Tips of the Day

Free up Memory:

  • Manual garbage collection can be performed on timely or event based mechanism.
import gc
collected_objects = gc.collect()