Python Coding Challange - Question With Answer(01220225)

 

Code Analysis and Explanation

queue = {'name', 'age', 'DOB'}
print(queue)

1. Understanding the Code

• queue is assigned a set containing three string elements: 'name', 'age', and 'DOB'.
• The print(queue) statement displays the contents of the set.

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2. Key Properties of Sets in Python

a) Sets are Unordered

• Unlike lists ([]) or tuples (()), sets {} do not maintain a fixed order for their elements.
• When printing, Python determines the order dynamically, so the output may vary each time you run the code.

b) Sets Contain Unique Elements

• If duplicate values were added to the set, Python would automatically remove them because sets store only unique values.

c) Sets are Mutable

• You can add or remove elements from a set using .add() and .remove().

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3. Possible Outputs

Since sets do not maintain order, the printed output could be any of the following:

{'name', 'age', 'DOB'}
{'age', 'DOB', 'name'}
{'DOB', 'name', 'age'}
{'DOB', 'age', 'name'}

• The elements will always be present, but their order is not guaranteed.

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4. Why is the Order Different Each Time?

• Sets are implemented as hash tables in Python.
• Hashing ensures fast lookups but does not maintain order.

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5. What If You Want a Fixed Order?

If you want to maintain order, consider:

1. Using a List ([])

   queue = ['name', 'age', 'DOB']
   print(queue) # Always prints: ['name', 'age', 'DOB']

2. Sorting the Set Before Printing

   
   print(sorted(queue))  # Prints: ['DOB', 'age', 'name']

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6. Example Set Operations

queue.add('gender')    # Add an element
queue.remove('age') # Remove an element
print(queue) # Output may vary

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7. Summary

Sets are unordered → Elements may print in a different order.
Sets contain unique elements → Duplicates are automatically removed.
Use lists if order matters → Lists maintain insertion order.