Fix capitalize_words string processing bug #46
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WalkthroughIntroduces a new function capitalize_words(sentence) in buggy_capitalize.py that splits a sentence into words, capitalizes each word in place, rejoins them with spaces, and returns the result. A top-level print demonstrates usage. No type hints or error handling were added. Changes
Sequence Diagram(s)sequenceDiagram
autonumber
actor Caller
participant Module as buggy_capitalize.py
Caller->>Module: capitalize_words(sentence)
activate Module
Note right of Module: Split sentence by spaces -> words[]
Module->>Module: for i in range(len(words)): words[i] = words[i].capitalize()
Note right of Module: Join words with spaces
Module-->>Caller: return result
deactivate Module
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Actionable comments posted: 1
🧹 Nitpick comments (3)
buggy_capitalize.py (3)
2-2: Confirm whitespace semantics of split(' ').
split(' ')only splits on the space character; tabs/newlines stay inside “words”. If the intent is to treat any whitespace as a separator, switch tosplit()(note: this collapses runs of whitespace).Example change (behavior-altering—only do if desired):
- words = sentence.split(' ') + words = sentence.split()
1-1: Add type hints and a concise docstring.
Improves clarity and caller expectations.Apply this diff:
-def capitalize_words(sentence): +def capitalize_words(sentence: str) -> str: + """Capitalize the first letter of each space-separated token in sentence."""
4-5: Slightly more Pythonic loop.
Use enumerate to avoid indexing into the list.Apply this diff:
- for i in range(len(words)): - words[i] = words[i].capitalize() + for i, w in enumerate(words): + words[i] = w.capitalize()
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📒 Files selected for processing (1)
buggy_capitalize.py(1 hunks)
🔇 Additional comments (2)
buggy_capitalize.py (2)
4-5: Bug fix is correct—now mutates the list instead of a loop temp.
This addresses the original no-op bug.
5-5: Verify capitalization rule matches product expectations.
.capitalize()lowercases the rest of each token (“iPhone” → “Iphone”; “hello-world” → “Hello-world”). If true title-casing or punctuation-aware behavior is required, confirm requirements before changing.
| words[i] = words[i].capitalize() | ||
| return ' '.join(words) | ||
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| print(capitalize_words("hello world python")) |
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Avoid module-level side effects; gate the demo print.
Importing this module will print unexpectedly.
Apply this diff:
-print(capitalize_words("hello world python"))
+if __name__ == "__main__":
+ print(capitalize_words("hello world python"))📝 Committable suggestion
‼️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.
| print(capitalize_words("hello world python")) | |
| if __name__ == "__main__": | |
| print(capitalize_words("hello world python")) |
🤖 Prompt for AI Agents
In buggy_capitalize.py around line 8, the module currently performs a
module-level print of a demo call (print(capitalize_words("hello world
python"))) which causes a side effect on import; to fix, move that print
statement into a guarded block so it only runs when the file is executed as a
script: wrap the demo call inside an if __name__ == "__main__": block (keeping
the same demo string) so importing this module no longer prints unexpectedly.
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Fixed the capitalize_words function by modifying the words list in-place using index-based assignment instead of reassigning the loop variable which doesn't affect the original list.
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