167. Asynchronous File I/O with aiofiles

Here are 10 Python snippets demonstrating how to perform asynchronous file I/O operations using the aiofiles library. Each snippet is separated by a delimiter.

---

Snippet 1: Writing to a File Asynchronously

import aiofiles
import asyncio

async def write_file():
    async with aiofiles.open("example.txt", mode="w") as f:
        await f.write("Hello, World!")

asyncio.run(write_file())

---

Snippet 2: Reading a File Asynchronously

import aiofiles
import asyncio

async def read_file():
    async with aiofiles.open("example.txt", mode="r") as f:
        content = await f.read()
        print(content)

asyncio.run(read_file())

---

Snippet 3: Appending to a File Asynchronously

import aiofiles
import asyncio

async def append_file():
    async with aiofiles.open("example.txt", mode="a") as f:
        await f.write("\nThis is appended text.")

asyncio.run(append_file())

---

Snippet 4: Reading a File Line by Line Asynchronously

import aiofiles
import asyncio

async def read_lines():
    async with aiofiles.open("example.txt", mode="r") as f:
        async for line in f:
            print(line.strip())

asyncio.run(read_lines())

---

Snippet 5: Writing JSON Data Asynchronously

import aiofiles
import asyncio
import json

async def write_json():
    data = {"name": "Alice", "age": 30}
    async with aiofiles.open("data.json", mode="w") as f:
        await f.write(json.dumps(data))

asyncio.run(write_json())

---

Snippet 6: Reading JSON Data Asynchronously

import aiofiles
import asyncio
import json

async def read_json():
    async with aiofiles.open("data.json", mode="r") as f:
        content = await f.read()
        data = json.loads(content)
        print(data)

asyncio.run(read_json())

---

Snippet 7: Copying File Contents Asynchronously

import aiofiles
import asyncio

async def copy_file(src, dest):
    async with aiofiles.open(src, mode="r") as source:
        content = await source.read()
    async with aiofiles.open(dest, mode="w") as destination:
        await destination.write(content)

asyncio.run(copy_file("example.txt", "example_copy.txt"))

---

Snippet 8: Checking File Existence Asynchronously

import aiofiles.os
import asyncio

async def check_file():
    exists = await aiofiles.os.path.exists("example.txt")
    print(f"File exists: {exists}")

asyncio.run(check_file())

---

Snippet 9: Asynchronous File Deletion

import aiofiles.os
import asyncio

async def delete_file():
    await aiofiles.os.remove("example_copy.txt")
    print("File deleted!")

asyncio.run(delete_file())

---

Snippet 10: Asynchronous File Writing with Buffering

import aiofiles
import asyncio

async def buffered_write():
    async with aiofiles.open("buffered.txt", mode="w") as f:
        for i in range(10):
            await f.write(f"Line {i}\n")

asyncio.run(buffered_write())

---