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PYTHON PROGRAM • STRINGS

Count Vowels in a String in Python

Learn count vowels in a string in python with a short, executable Python example.

BeginnerGenerator expressionMembership

PROBLEM UNDERSTANDING

Input and expected output

Sample input
No input required
Sample output
10

COMPLETE PYTHON PROGRAM

Complete Python implementation

python-count-vowels.py
Open in compiler
text = 'Artificial Intelligence'
count = sum(character.lower() in 'aeiou' for character in text)
print(count)

GUIDED CODE TOUR • NOT LIVE EXECUTION

Study the program line by line

Use the real compiler button above to run and debug with different inputs.

CURRENT STEP

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SELECTED LINE

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EXPECTED OUTPUT FOR THE SAMPLE

10
0%Step 0 of 0

PROGRAM EXPLANATION

Algorithm and explanation

  1. Initialize the sample values used to count vowels in a string.
  2. Process the data step by step using Generator expression and Membership.
  3. Display the result for count vowels in a string and compare it with the documented sample output.

This example of count vowels in a string processes the sample values in a controlled iteration. It demonstrates Generator expression and Membership and prints a deterministic result that can be checked against the sample output.

EFFICIENCY

Time and space complexity

Time complexity

O(n)

Auxiliary space

O(n)

DEBUGGING CHECKLIST

Common mistakes

Check this

For count vowels in a string, keep the data shape and value types consistent with Generator expression.

Check this

Keep every dependent statement inside the correct indented Python block.

Check this

Verify the final Generator expression and Membership result against the sample before trying new data.

Try it yourself

Practice: Run the program with the sample input, predict its output, and then test one boundary case of your own.