added file downloader tutorial

Author: x4nth055

README.md

@@ -34,6 +34,7 @@ This is a repository of all the tutorials of [The Python Code](https://www.thepy
     - [How to Make a Process Monitor in Python](https://www.thepythoncode.com/article/make-process-monitor-python). ([code](general/process-monitor))
     - [How to Make a Screen Recorder in Python](https://www.thepythoncode.com/article/make-screen-recorder-python). ([code](general/screen-recorder))
     - [How to Generate and Read QR Code in Python](https://www.thepythoncode.com/article/generate-read-qr-code-python). ([code](general/generating-reading-qrcode))
+    - [How to Download Files in Python](https://www.thepythoncode.com/article/download-files-python). ([code](general/file-downloader))
 
 - ### [Web Scraping](https://www.thepythoncode.com/topic/web-scraping)
     - [How to Access Wikipedia in Python](https://www.thepythoncode.com/article/access-wikipedia-python). ([code](general/wikipedia-extractor))

general/file-downloader/README.md

@@ -0,0 +1,11 @@
+# [How to Download Files in Python](https://www.thepythoncode.com/article/download-files-python)
+To download a file using Python:
+- `pip3 install -r requirements.txt`
+-
+    ```
+    python download.py https://download.winzip.com/gl/nkln/winzip24-downwz.exe
+    ```
+    This will start downloading the file and **outputs** something like this:
+    ```
+    Downloading winzip24-downwz.exe:   6%|█████▏                                                                         | 779k/11.8M [00:03<00:55, 210kB/s]
+    ```

general/file-downloader/download.py

@@ -0,0 +1,25 @@
+from tqdm import tqdm
+import requests
+import sys
+
+# the url of file you want to download, passed from command line arguments
+url = sys.argv[1]
+# read 1024 bytes every time 
+buffer_size = 1024
+# download the body of response by chunk, not immediately
+response = requests.get(url, stream=True)
+
+# get the total file size
+file_size = int(response.headers.get("Content-Length", 0))
+
+# get the file name
+filename = url.split("/")[-1]
+
+# progress bar, changing the unit to bytes instead of iteration (default by tqdm)
+progress = tqdm(response.iter_content(buffer_size), f"Downloading {filename}", total=file_size, unit="B", unit_scale=True, unit_divisor=1024)
+with open(filename, "wb") as f:
+    for data in progress:
+        # write data read to the file
+        f.write(data)
+        # update the progress bar manually
+        progress.update(len(data))

general/file-downloader/requirements.txt

@@ -0,0 +1,2 @@
+tqdm
+requests