cli-string 0.1.0

This CLI tool analyzes a string or a file containing strings and outputs **only the characters that appear exactly once** in each line (case-insensitive). Additionally, it measures the execution time of the function call.

Unique Characters in a String

This CLI tool analyzes a string or a file containing strings and outputs only the characters that appear exactly once in each line (case-insensitive). Additionally, it measures the execution time of the function call.

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🔍 Features

• ✅ Detects unique characters only (characters that appear exactly once).
• 🔠 Case-insensitive comparison (e.g., 'A' and 'a' are treated as the same).
• ♻️ Result caching with functools.lru_cache for optimized repeated calls.
• ⏱ Execution time logging using the custom perf_counter_deco decorator.

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📦 Installation

1. Make sure you're using Python 3.12 or later.
2. Install the package locally or from a distribution (if published):

pip install cli_string

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🚀 Usage

Suppose your main script is named main.py.

Analyze a single string:

python main.py --string "Example"

Analyze lines from a file:

python main.py --file path/to/file.txt

⚠️ If both --string and --file are provided, the file input takes precedence.

Provide both string and file:

python main.py --file path/to/file.txt --string "Example"

If no arguments are provided:

Please provide a string or a file with lines to process.

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📤 Example Output

String: 'Hello, World' => Unique characters: he, wrd

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🧠 Function Breakdown

count_chars_in_string(s: str) -> str • Validates input type and non-emptiness. • Uses collections.Counter to identify characters that appear only once. • Returns the resulting characters in lowercase. • Output is cached using @lru_cache. • Execution time is measured with the @perf_counter_deco.

main() • Parses command-line arguments: • --string: input string to analyze. • --file: path to a file containing strings. • Prioritizes file input if both are passed. • Prints formatted results for each line. • Handles missing arguments gracefully.

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📁 Project Structure

cli_string/ ├── init.py ├── main.py ├── utils.py pyproject.toml README.md

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👨‍💻 Author

Daniel Kravchenko 📧 [e-mail]

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📄 License

Distributed under the MIT License.

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