Python Coding Challange - Question With Answer(01280325)

 

Explaining String Slicing: word[4:-3:2] in Python

Given the string:

word = 'pythonCoding'

Let's break down the slicing operation [4:-3:2]:

Understanding the Slicing Syntax

word[start:end:step]

• start = 4 → Begins at index 4 (5th character).

• end = -3 → Stops at index -3 (3rd character from the end, not included).

• step = 2 → Selects every second character.

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Indexing the String

word = 'pythonCoding'
        p y t h o n C o d i n g
index 0 1 2 3 4 5 6 7 8 9 10 11
-index -12 -11 -10 -9 -8 -7 -6 -5 -4 -3 -2 -1

Now, applying word[4:-3:2]:

1. Start at index 4 → 'o'

2. Step by 2:

   • Index 6 → 'C'

   • Index 8 → 'd'

3. Stop before index -3 ('i')

Thus, the selected characters are 'oCd'.

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Verifying with Code

word = 'pythonCoding'
print(word[4:-3:2]) # Output: 'oCd'

Visualizing the Selection

word = 'pythonCoding'
        p y t h o n C o d i n g
index 0 1 2 3 4 5 6 7 8 9 10 11
        ↓    ↓   ↓ 
        o    C   d

Each selected character:

• 'o' → (index 4)

• 'C' → (index 6, after skipping n)

• 'd' → (index 8, after skipping o)

The slicing stops before reaching 'i' (index -3).

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Conclusion

This slicing technique efficiently extracts a pattern of characters using:  Sart and end indexes
Step size for skipping characters
Combination of positive & negative indexing

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