Python 3 download file from url

I'm using Python 3. However I always get an error saying that the type in the function above has to be bytes, and not string.

I've tried using the URL. So basically my question is how to download a file from a server when the URL is stored in a string type? If you want to obtain the contents of a web page into a variable, just read the response of urllib. The easiest way to download and save a file is to use the urllib. But keep in mind that urlretrieve is considered legacy and might become deprecated not sure why, though. So the most correct way to do this would be to use the urllib. If this seems too complicated, you may want to go simpler and store the whole download in a bytes object and then write it to a file.

But this works well only for small files. It is possible to extract. I hope I understood the question right, which is: how to download a file from a server when the URL is stored in a string type? The following functions and classes are ported from the Python 2 module urllib as opposed to urllib2. They might become deprecated at some point in the future. You can use wget which is popular downloading shell tool for that. Here is an example.

Yes, definietly requests is great package to use in something related to HTTP requests. For example, If I use the machine learning method, train a model that can recognize an image with the number bar code. If you are using Linux you can use the wget module of Linux through the python shell. I will be using the god-send library requests for it. I will write about methods to correctly download binaries from URLs and set their filenames. Requests is a versatile HTTP library in python with various applications.

One of its applications is to download a file from web using the file URL. Installation: First of all, you would need to download the requests library. Download images from Google Image search using Python - gist The requests library get method automatically follows the redirect and download the actual file. It will require a lot of memory and might cause out of memory error. Then we can use a for loop to read the chunks and write it into the local file. The requests module is perfect for it.

We can also specify the HTTP methods to download the file. Reference : Requests Module Official Docs. Your email address will not be published. So if the file is large, this will do nothing but waste bandwidth. I looked into the requests documentation and found a better way to do it. That way involved just fetching the headers of a url before actually downloading it.

This allows us to skip downloading files which weren't meant to be downloaded. To restrict download by file size, we can get the filesize from the Content-Length header and then do suitable comparisons. We can parse the url to get the filename.

This will be give the filename in some cases correctly. However, there are times when the filename information is not present in the url. In that case, the Content-Disposition header will contain the filename information. Here is how to fetch it. The url-parsing code in conjuction with the above method to get filename from Content-Disposition header will work for most of the cases.