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Convert a Dictionary to a List of Tuples

Certification: Intermediate Level Accuracy: 71.43% Submissions: 7 Points: 5

Write a Python program that converts a dictionary into a list of tuples, where each tuple contains a key-value pair.

Example 1
    
  
  • Input: {'a': 1, 'b': 2, 'c': 3}
    • 
  
  • Output: [('a', 1), ('b', 2), ('c', 3)]
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  • Explanation: 
    
      
      
    • Step 1: Take the input dictionary {'a': 1, 'b': 2, 'c': 3}.
      • 
      
    • Step 2: For each key-value pair in the dictionary, create a tuple (key, value).
      • 
      
    • Step 3: Add each tuple to a list.
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    • Step 4: Return the list of tuples [('a', 1), ('b', 2), ('c', 3)].
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    •
Example 2
    
  
  • Input: {'x': 5, 'y': 2, 'z': 8}
    • 
  
  • Output: [('x', 5), ('y', 2), ('z', 8)]
    • 
  
  • Explanation: 
    
      
      
    • Step 1: Take the input dictionary {'x': 5, 'y': 2, 'z': 8}.
      • 
      
    • Step 2: For each key-value pair in the dictionary, create a tuple (key, value).
      • 
      
    • Step 3: Add each tuple to a list.
      • 
      
    • Step 4: Return the list of tuples [('x', 5), ('y', 2), ('z', 8)].
      • 
    
    
  
    •
Constraints
    
  
  • 1 ≤ len(d) ≤ 10^3
    • 
  
  • -10^5 ≤ d[key] ≤ 10^5
    • 
  
  • Time Complexity: O(n), where n is the number of key-value pairs
    • 
  
  • Space Complexity: O(n)
    •
TupleDictionaries Goldman Sachs
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Hint
Solution

Solution Hints

    
  
  • Use the items() method to get key-value pairs from the dictionary.
    • 
  
  • Convert the result of items() directly into a list.
    • 
  
  • Alternatively, use a list comprehension to create the list of tuples.
    •

Steps to solve by this approach:

 Step 1: Access the items() method of the dictionary.
 Step 2: The items() method returns a view object of (key, value) tuples.
 Step 3: Convert this view object to a list using the list() constructor.
 Step 4: This creates a list where each element is a tuple of (key, value).
 Step 5: The order in Python 3.7+ dictionaries is insertion order.
 Step 6: Return the created list of tuples.
 Step 7: Example: {'a': 1, 'b': 2, 'c': 3} becomes [('a', 1), ('b', 2), ('c', 3)].

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