Enhanced String Manipulation: Robust Utility Implementation with Comprehensive Testing #2
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WalkthroughA new string reversal function was added to the codebase, including input validation for string types. Corresponding unit tests were created to verify standard, edge, and error cases for this function. Additionally, the Changes
Sequence Diagram(s)sequenceDiagram
participant Tester as tests/test_string_utils.py
participant StringUtils as src/string_utils.py
Tester->>StringUtils: reverse_string(input_string)
alt input is not a string
StringUtils-->>Tester: raise TypeError
else input is a string
StringUtils-->>Tester: return reversed string
end
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🧹 Nitpick comments (3)
requirements.txt (1)
1-1: Good addition for enabling test infrastructure.Adding pytest is appropriate for the unit tests created in this PR.
Consider pinning pytest to a specific version for better reproducibility (e.g.,
pytest==7.3.1). This prevents potential future compatibility issues if newer pytest versions introduce breaking changes.src/string_utils.py (1)
1-26: Well-implemented string reversal function with good documentation and error handling.The implementation has:
- Clear docstring with proper descriptions of args, returns, and exceptions
- Appropriate input validation with descriptive error messages
- Efficient O(n) time complexity using manual character-by-character iteration
- Good use of list accumulation for performance before joining
While this manual implementation is perfectly valid and demonstrates good understanding of the algorithm, Python does offer a built-in slicing approach for string reversal that could be more concise:
def reverse_string(input_string): """ Reverse a given string using a manual character-by-character approach. Args: input_string (str): The string to be reversed. Returns: str: The reversed string. Raises: TypeError: If the input is not a string. """ # Validate input is a string if not isinstance(input_string, str): raise TypeError("Input must be a string") - # Use a list to build the reversed string - reversed_chars = [] - - # Iterate through the string from end to beginning - for i in range(len(input_string) - 1, -1, -1): - reversed_chars.append(input_string[i]) - - # Convert list of characters back to string - return ''.join(reversed_chars) + # Use Python's slice notation for reversing the string + return input_string[::-1]This is merely a stylistic suggestion - your manual implementation is educationally valuable and explicitly shows the algorithm.
tests/test_string_utils.py (1)
23-32: Good error handling tests.Properly verifies that TypeError is raised with the correct message for different types of invalid inputs.
Consider adding one more test for performance with very long strings to ensure the implementation handles large inputs efficiently:
def test_reverse_string_performance(): """Test reversal of a very long string.""" long_string = "a" * 100000 assert reverse_string(long_string) == "a" * 100000
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src/__pycache__/string_utils.cpython-312.pycis excluded by!**/*.pyctests/__pycache__/test_string_utils.cpython-312-pytest-8.3.5.pycis excluded by!**/*.pyc
📒 Files selected for processing (3)
requirements.txt(1 hunks)src/string_utils.py(1 hunks)tests/test_string_utils.py(1 hunks)
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src/string_utils.py (1)
reverse_string(1-26)
🔇 Additional comments (4)
tests/test_string_utils.py (4)
4-8: Good basic test cases for string reversal.These test cases verify the core functionality with simple ASCII strings.
9-11: Good edge case testing for empty strings.Testing empty string handling is essential for robust functions.
13-17: Comprehensive testing with special characters and whitespace.Testing with special characters and spaces ensures the function works correctly with non-alphanumeric inputs.
18-22: Excellent Unicode support testing.Testing with complex Unicode characters (Japanese text and emojis) demonstrates thorough validation of the function's internationalization capabilities.
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Enhanced String Manipulation: Robust Utility Implementation with Comprehensive Testing
Description
Summary of Work
This pull request establishes a robust string manipulation utility with a comprehensive testing strategy, focusing on reliability, flexibility, and thorough input validation.
Key Objectives:
The implementation provides a solid foundation for string manipulation operations, with particular emphasis on handling complex input scenarios including Unicode, special characters, and edge cases.
Changes Made
Functional Enhancements:
Architectural Improvements:
Tests and Verification
Test Coverage Highlights:
PRs Merged
The following pull requests have been merged:
Signatures
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