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advanced patterns When Writing Files Using Python's AsyncIO and aiofiles

👀 Views: 17 💬 Answers: 1 📅 Created: 2025-07-17
python asyncio aiofiles Python

I'm prototyping a solution and After trying multiple solutions online, I still can't figure this out. I'm working with an scenario when trying to write to a file asynchronously using `aiofiles` in Python 3.9. The code attempts to write multiple lines to a file, but only the first line seems to be saved correctly. Here's a simplified version of what I'm trying to achieve: ```python import asyncio import aiofiles async def write_to_file(): async with aiofiles.open('output.txt', mode='w') as f: await f.write('First line.\n') await f.write('Second line.\n') await f.write('Third line.\n') async def main(): await write_to_file() if __name__ == '__main__': asyncio.run(main()) ``` After running this code, I only see 'First line.' in the `output.txt` file. The subsequent lines don't appear, which is puzzling. I’ve also checked for any exceptions or errors in the console, but none are raised. I tried adding `await f.flush()` after writing each line to see if it would help, but that didn’t change anything. Additionally, I verified that the file is not being overwritten by another process while I'm writing to it. Could this be an scenario with how `aiofiles` handles file operations, or am I missing something crucial in my implementation? Any insights would be greatly appreciated! I'm coming from a different tech stack and learning Python. I'm using Python stable in this project. Any ideas how to fix this?