Python Script to download large files in parts using curl

Question

My Institute doesn't allow file downloads more than 300MB so I came up with this trick of downloading the files in parts! Now I wanted to ease the task and make a script in python! I'm using os.system() to execute commands!

My plan is to use this curl --range 300000000*X-(300000000*(X+1)-1) [url] -o filename.partX # X is the part number

But I have no idea how to terminate the loop! How would i know that the all available parts of file are downloaded! Can anyone help me out with this?

Answer 1

# repeat download if fail to download the big file
until curl -C - -o partial_file.zip http://example.com/file.zip; do
    echo Tansfer disrupted, retrying in 10 seconds...
    sleep 10
done