Improve fibonacchi example #11
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Summary of Changes
Hello @arvi18, I'm Gemini Code Assist1! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!
This pull request significantly refactors the Fibonacci number calculation example in main.py by introducing comprehensive input validation and a detailed docstring for the nth_fibonacci function. It also removes the direct execution example, making main.py more modular. Concurrently, a new test.py file has been added, providing a suite of unittest based tests to ensure the function's correctness and proper error handling for various inputs.
Highlights
- Enhanced Input Validation: The
nth_fibonaccifunction now includes robust checks to ensure the inputnis an integer and is non-negative, raisingTypeErrororValueErroraccordingly. - Improved Documentation: A new, detailed docstring has been added to the
nth_fibonaccifunction, clearly documenting its purpose, parameters, return value, and the exceptions it may raise. - New Unit Tests: A dedicated
test.pyfile has been introduced, containingunittesttest cases that verify the correctness of thenth_fibonaccifunction across various scenarios, including base cases, positive values, and error handling. - Code Cleanup and Refactoring: The initial simple recursive Fibonacci implementation and the direct execution example have been removed from
main.py, streamlining the file to focus on the memoized function and its utilities.
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🤖 Refacto.AI: PR Summary & Reviewer Guide🎯 1. The Goal (Why was this PR raised?)This PR aims to improve the Fibonacci number calculation implementation by adding error handling, documentation, and test coverage. The changes focus on replacing a simple recursive implementation with a more robust solution that includes input validation and proper testing. 🗺️ 2. The Changes (What was implemented?)
🤔 3. Key Areas for Human ReviewArea of Concern: Function Parameter Mismatch
Area of Concern: Function Signature Change
Area of Concern: Incomplete Code Removal
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Refacto is reviewing this PR. Please wait for the review comments to be posted. |
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Code Review
This pull request aims to improve the Fibonacci example, but it leaves the main.py file in a confusing and broken state. There are two different implementations of the nth_fibonacci function. The first, using memoization, is introduced in this PR but contains critical bugs: it uses an undefined variable and calls its utility function with the wrong number of arguments. The second implementation, using dynamic programming, overwrites the first one, making the new code effectively dead code. This also causes the new unit tests to fail, as they test for input validation that is only present in the broken, overwritten function.
I have left specific comments on the bugs in the new code. I recommend deciding on a single implementation for nth_fibonacci, fixing all associated bugs, and removing the other implementation to make the code clean and correct. The new unit tests are a great addition once the implementation is fixed!
| # Base case: if n is 0 or 1, return n | ||
| if n <= 1: | ||
| return n | ||
| return m |
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There's a typo here. The variable m is not defined. This will cause a NameError at runtime. It should be n.
| return m | |
| return n |
| raise TypeError("Input must be an integer") | ||
| if n < 0: | ||
| raise ValueError("Input must be non-negative") | ||
| return nth_fibonacci_util(n) |
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The call to nth_fibonacci_util is missing the memo argument, which will cause a TypeError because the function is defined to take two arguments. The nth_fibonacci function should be responsible for creating the memoization table and passing it to the utility function.
| return nth_fibonacci_util(n) | |
| memo = [-1] * (n + 1) | |
| return nth_fibonacci_util(n, memo) |
| def test_input_validation(self): | ||
| with self.assertRaises(TypeError): | ||
| nth_fibonacci('5') | ||
| with self.assertRaises(ValueError): | ||
| nth_fibonacci(-1) |
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These tests for input validation are a great addition, but they will fail with the current main.py. The main.py file defines nth_fibonacci twice. The version that gets imported and tested is the second, iterative one, which does not implement the TypeError and ValueError checks. These checks are only present in the first (broken) memoized implementation. This highlights the need to clean up main.py to have a single, correct implementation that matches the tests.
| n = 5 | ||
| result = nth_fibonacci(n) | ||
| print(result) | ||
| # Remove lines 57-59 entirely |
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This comment appears to be a leftover instruction from development and should be removed to keep the code clean.
Code Review: Fibonacci Implementation👍 Well Done
📌 Files Processed
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| # Base case: if n is 0 or 1, return n | ||
| if n <= 1: | ||
| return n | ||
| return m |
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Undefined Variable Reference
Variable 'm' is referenced but not defined, causing NameError at runtime. This will crash the application when nth_fibonacci_util is called with n <= 1.
| return m | |
| return n |
Standards
- ISO-IEC-25010-Reliability-Maturity
- ISO-IEC-25010-Functional-Correctness-Appropriateness
| # Base case: if n is 0 or 1, return n | ||
| if n <= 1: | ||
| return n | ||
| return m |
There was a problem hiding this comment.
Undefined Variable Reference
Variable 'm' is referenced but not defined, causing NameError at runtime. This will crash the application when nth_fibonacci_util is called with n <= 1.
| return m | |
| return n |
Standards
- ISO-IEC-25010-Reliability-Maturity
- ISO-IEC-25010-Functional-Correctness-Appropriateness
| raise TypeError("Input must be an integer") | ||
| if n < 0: | ||
| raise ValueError("Input must be non-negative") | ||
| return nth_fibonacci_util(n) |
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Missing Parameter Reference
Function call to nth_fibonacci_util is missing the required memo parameter. This will cause TypeError at runtime when the function is called, breaking application functionality.
| return nth_fibonacci_util(n) | |
| # Create a memoization table and initialize with -1 | |
| memo = [-1] * (n + 1) | |
| # Call the utility function | |
| return nth_fibonacci_util(n, memo) |
Standards
- ISO-IEC-25010-Reliability-Fault-Tolerance
- ISO-IEC-25010-Functional-Correctness-Appropriateness
| # Remove lines 57-59 entirely | ||
|
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Unused Code Block
Comment indicates code removal but actual code remains. This creates confusion about what code should be removed and leaves potentially dead code in the codebase.
| # Remove lines 57-59 entirely |
Standards
- Clean-Code-Dead-Code
- Clean-Code-Comments
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/refacto-test |
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