improve fibonacchi examples [change in title]

[frodo-repo]

PR Type

enhancement

---

Description

• Replaced recursive Fibonacci implementation with an iterative approach.

• Added a new Fibonacci function using memoization for efficiency.

• Improved code readability and performance for Fibonacci calculations.

---

Changes walkthrough 📝

	Relevant files
Enhancement	main.py Enhanced Fibonacci implementations with iterative and memoization methods main.py Removed recursive Fibonacci function. Added an iterative Fibonacci function for better performance. Retained and improved memoization-based Fibonacci function. Updated example usage to reflect new implementations. +30/-14

---

Need help?

Type /help how to ... in the comments thread for any questions about Qodo Merge usage.

Check out the documentation for more information.

[frodo-repo]

/add_docs main.py
--pr_add_docs.docs_style="Notion page"

[qodo-merge-pro]

Qodo Merge was enabled for this repository. To continue using it, please link your Git account with your Qodo account here.

PR Reviewer Guide 🔍

Here are some key observations to aid the review process:

⏱️ Estimated effort to review: 2 🔵🔵⚪⚪⚪

🧪 No relevant tests

🔒 No security concerns identified

⚡ Recommended focus areas for review Duplicate Function Two functions with the same name nth_fibonacci exist in the file. This will cause the second implementation to override the first one, potentially breaking existing code that depends on the memoized version. def nth_fibonacci(n): if n <= 1: return n # To store the curr Fibonacci number curr = 0 # To store the previous Fibonacci numbers prev1 = 1 prev2 = 0 # Loop to calculate Fibonacci numbers from 2 to n for i in range(2, n + 1): # Calculate the curr Fibonacci number curr = prev1 + prev2 # Update prev2 to the last Fibonacci number prev2 = prev1 # Update prev1 to the curr Fibonacci number prev1 = curr return curr Variable Naming The variable name curr is abbreviated and could be more descriptive. Consider renaming to current_fib or similar for better code readability. curr = 0

[qodo-merge-pro]

Qodo Merge was enabled for this repository. To continue using it, please link your Git account with your Qodo account here.

PR Code Suggestions ✨

Explore these optional code suggestions:

Category	Suggestion	Impact
Possible issue	✅ Add input validation checks Add input validation to handle negative numbers and non-integer inputs, as Fibonacci sequence is only defined for non-negative integers. main.py [62-64] def nth_fibonacci(n): + if not isinstance(n, int): + raise TypeError("Input must be an integer") + if n < 0: + raise ValueError("Input must be non-negative") if n <= 1: return n [Suggestion has been applied] Suggestion importance[1-10]: 8 __ Why: Adding input validation is crucial for robustness and preventing runtime errors. The suggestion properly handles both type checking and value range validation for the Fibonacci function input.	Medium
Update

[frodo-repo]

/custom_prompt
--pr_custom_prompt.prompt=""
The code suggestions should focus only on the following:

1. is this pr suitable for merge?
   ""

[qodo-merge-pro]

Custom Prompt Suggestions 🎨

Category	Suggestion	Score
Possible bug	Add input validation for negative numbers in the Fibonacci function Consider adding input validation to check if n is negative, as Fibonacci sequence is typically defined for non-negative integers only. This would prevent unexpected behavior for invalid inputs. main.py [62-64] def nth_fibonacci(n): + if n < 0: + raise ValueError("Fibonacci sequence is not defined for negative numbers") if n <= 1: return n Suggestion importance[1-10]: 9 Why: This is an important defensive programming practice that prevents invalid inputs and makes the function more robust. The suggestion correctly identifies a potential bug in the new implementation.	9
Maintainability	Use more descriptive variable names in the Fibonacci calculation function Consider using more descriptive variable names instead of prev1, prev2, and curr. Names like previous, two_before, and current_fib would make the code more readable and self-documenting. main.py [67-71] -curr = 0 -prev1 = 1 -prev2 = 0 +current_fib = 0 +previous = 1 +two_before = 0 Suggestion importance[1-10]: 8 Why: The suggested variable names are more descriptive and self-documenting, making the code's intent clearer. This is a valid maintainability improvement for the new iterative Fibonacci implementation.	8
	Add function documentation using docstring Consider adding a docstring to document the function's purpose, parameters, return value, and any constraints. This would improve code documentation and help other developers understand the function's usage. main.py [62-64] def nth_fibonacci(n): + """Calculate the nth number in the Fibonacci sequence. + + Args: + n: A non-negative integer representing the position in the sequence. + + Returns: + The nth Fibonacci number. + + Raises: + ValueError: If n is negative. + """ if n <= 1: return n Suggestion importance[1-10]: 8 Why: Adding comprehensive docstring documentation is important for code maintainability and usability. The suggestion provides a well-structured docstring template with all relevant information.	8
Enhancement	Add type hints to the Fibonacci function signature Consider adding type hints to the function parameters and return value. This would improve code documentation and enable better IDE support and static type checking. main.py [62] -def nth_fibonacci(n): +def nth_fibonacci(n: int) -> int: Suggestion importance[1-10]: 7 Why: Type hints improve code documentation and enable better tooling support. This is a valid enhancement for the new Fibonacci implementation, though not critical for functionality.	7

[qodo-merge-pro]

Suggestion: Add input validation checks

Suggested change

	def nth_fibonacci(n):
	if n <= 1:
	return n
	def nth_fibonacci(n):
	if not isinstance(n, int):
	raise TypeError("Input must be an integer")
	if n < 0:
	raise ValueError("Input must be non-negative")
	if n <= 1:
	return n

[frodo-repo]

I have only positive integers in test cases so no need to these checks

[frodo-repo]

/update_changelog

[qodo-merge-pro]

Qodo Merge was enabled for this repository. To continue using it, please link your Git account with your Qodo account here.

Changelog updates: 🔄

[2025-02-20][https://github.com//pull/1]

Changed

• Improved Fibonacci implementation with iterative and memoization approaches
• Enhanced performance and readability of Fibonacci calculations

to commit the new content to the CHANGELOG.md file, please type:
'/update_changelog --pr_update_changelog.push_changelog_changes=true'

[frodo-repo]

new comment on this pr

[frodo-repo]

review comment

[frodo-repo]

comment

[frodo-repo]

hello

[frodo-repo]

comment