Download Manager — it is essentially a computer program designed to download individual files from the Internet. Here we are going to create a simple download manager using streams in Python. Using multithreading, a file can be loaded as chunks simultaneously from different threads. To accomplish this, we're going to create a simple command line tool that takes the url of a file and then downloads it.
Windows machine with Python installed. p>
Download the following packages from the command line.
pip install click
pip install requests
pip install threading
( Note: The program has been broken up to make it easier to understand. Make sure you don't miss any part of the code while the code is running.)
Note: this code will not work online.
# Import required packages
# The code below is used for each section of the processed file
# for each branch to download content from the specified
# storage space
Handler (start, end, url, filename):
# specify the beginning and end of the file
' bytes =% d-% d'
(start, end)} p >
# request the specified part and get into variable
requests.get (url, headers
# open the file and write the content of the html page
# to file.
"r + b"
) as fp:
fp.tell ( )
Now we're going to implement the actual functionality in the download_file function.
The following code is part of the "download_file" function.
| tr> |
Create file with content size
Now we create Threads and pass the Handler function, which has the main functionality:
Finally join the streams and call function "download_file" from main
We are done with some of the coding and are now following the commands shown below, to run the .py file.
“python filename.py” –-help
This command shows the "Usage" of the click command tool and the options the tool can accept.
Below is an example of a command where we are trying to load a jpg image file from a URL and also given a name and number_of_threads.
Finally, we have successfully done this, and this is one way to create a simple multi-threaded download manager in Python.
This article contributed by Rahul Boyanapalli . If you are as Python.Engineering and would like to contribute, you can also write an article using contribute.python.engineering or by posting an article contribute @ python.engineering. See my article appearing on the Python.Engineering homepage and help other geeks.
Please post comments if you find anything wrong or if you would like to share more information on the topic discussed above.