PYTHON PROGRAM • STRINGS
Count Character Frequency in Python
Learn count character frequency in python with a short, executable Python example.
PROBLEM UNDERSTANDING
Input and expected output
No input required
{'a': 3, 'b': 1, 'n': 2}COMPLETE PYTHON PROGRAM
Complete Python implementation
text = 'banana'
print({character: text.count(character) for character in sorted(set(text))})CURRENT STEP
Select Start to walk through the important lines.
SELECTED LINE
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EXPECTED OUTPUT FOR THE SAMPLE
{'a': 3, 'b': 1, 'n': 2}PROGRAM EXPLANATION
Algorithm and explanation
- Initialize the sample values used to count character frequency.
- Process the data step by step using Dictionary comprehension and count().
- Display the result for count character frequency and compare it with the documented sample output.
This example of count character frequency processes the sample values in a controlled iteration. It demonstrates Dictionary comprehension and count() and prints a deterministic result that can be checked against the sample output.
EFFICIENCY
Time and space complexity
O(n²)
O(n)
DEBUGGING CHECKLIST
Common mistakes
For count character frequency, keep the data shape and value types consistent with Dictionary comprehension.
Keep every dependent statement inside the correct indented Python block.
Verify the final Dictionary comprehension and count() result against the sample before trying new data.