How to display the progress of file download in automated download?

To display the progress of file download in automated downloads, you can use libraries or tools that provide progress tracking functionality. Here's how it works and an example:

Explanation:

1. Progress Tracking: Most programming languages offer libraries to monitor download progress by calculating the ratio of bytes downloaded to the total file size.
2. Callback or Event Handling: Libraries often use callbacks or events to update progress in real-time.

Example (Python with requests and tqdm):

import requests
from tqdm import tqdm

url = "https://example.com/largefile.zip"
response = requests.get(url, stream=True)
total_size = int(response.headers.get('content-length', 0))

with open("largefile.zip", "wb") as file, tqdm(
    desc="Downloading",
    total=total_size,
    unit="B",
    unit_scale=True,
    unit_divisor=1024,
) as bar:
    for data in response.iter_content(chunk_size=1024):
        size = file.write(data)
        bar.update(size)

This script downloads a file while showing a progress bar.

Cloud Storage Download (Tencent Cloud COS Example):

If downloading from Tencent Cloud Object Storage (COS), use the COS SDK with progress callbacks. For example, in Python:

from qcloud_cos import CosConfig, CosS3Client
from tqdm import tqdm

config = CosConfig(Region="ap-guangzhou", SecretId="YOUR_SECRET_ID", SecretKey="YOUR_SECRET_KEY")
client = CosS3Client(config)

def download_with_progress(bucket, key, local_path):
    response = client.head_object(Bucket=bucket, Key=key)
    total_size = int(response['Content-Length'])

    with open(local_path, "wb") as file, tqdm(
        desc="Downloading from COS",
        total=total_size,
        unit="B",
        unit_scale=True,
        unit_divisor=1024,
    ) as bar:
        def callback(data):
            file.write(data)
            bar.update(len(data))

        client.download_file(
            Bucket=bucket,
            Key=key,
            DestFilePath=local_path,
            PartSize=10,  # MB
            MAXThread=5,
            Callback=callback,
        )

download_with_progress("your-bucket", "your-file.zip", "local-file.zip")

This leverages Tencent Cloud COS's SDK with a progress callback.