python download file from url example
Use the requests library and set stream=True to achieve efficient file download and avoid memory overflow; 2. Read data in chunks through response.iter_content and write files in binary mode, which is suitable for all types of file types; 3. You can automatically extract the original file name from the URL and save it by combining urlparse and os.path.basename; 4. It is recommended to add timeout parameters and simulate browser request headers to improve download stability; 5. Make sure that the URL is a direct file link, and pay attention to the access restrictions and disk space of the target website. This method is suitable for most common scenarios, and the file has been successfully downloaded as: downloaded_file.pdf.
Downloading files is a common operation in Python. Here is a simple and practical example showing how to download files from URLs, suitable for most common scenarios.

✅ Use the requests
library to download files (recommended method)
This is the most commonly used and concise method. You need to install requests
first:
pip install requests
Sample code: Download the file and save it locally
import requests url = "https://example.com/file.pdf" # Replace with the file link you want to download local_filename = "downloaded_file.pdf" # Saved local file name response = requests.get(url, stream=True) # Check whether the request is successful if response.status_code == 200: with open(local_filename, 'wb') as file: for chunk in response.iter_content(chunk_size=8192): # 8KB is read each time file.write(chunk) print(f"File has been successfully downloaded as: {local_filename}") else: print(f"Download failed, status code: {response.status_code}")
? illustrate:
-
stream=True
: means streaming download, suitable for large files, and avoid memory overflow. -
iter_content(chunk_size=8192)
: read in chunks to save memory. - Write files using binary mode
'wb'
, which is suitable for all file types (PDF, pictures, videos, etc.).
? Get the original file name (optional optimization)
If you want to automatically save with the file name in the URL:

import os from urllib.parse import urlparse # Extract file name from URL parsed_url = urlparse(url) filename = os.path.basename(parsed_url.path) if not filename: filename = "downloaded_file" # Save as extracted file name local_filename = filename
? Additional suggestions for handling redirects or large files
Add timeout to avoid jamming:
response = requests.get(url, stream=True, timeout=10)
Add request headers (some sites require):
headers = {'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64)'} response = requests.get(url, headers=headers, stream=True)
⚠️ Notes
- Make sure the URL is a direct file link, not a web page.
- Crawlers are prohibited from downloading, and cookies or login status are required.
- Check disk space, especially large files before downloading.
Basically that's it. Using
requests
stream=True
is the safest way and is suitable for most situations.The above is the detailed content of python download file from url example. For more information, please follow other related articles on the PHP Chinese website!

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