Flask name download files

As you see I have tested with four types of files. I hope this example will work with other file types as well. Now create a download. Notice in the above template file I am using Flask EL Expression language to evaluate the link endpoint. Now navigate to the project root directory from command line tool and execute the command python main.

If you want to change the port then you can change the line app. Any way to clear the cache from Flask? Improve this question. User User 1 1 gold badge 4 4 silver badges 9 9 bronze badges.

Add a comment. Active Oldest Votes. This is a good question about Flask and web development in general rather than specific to our system, so I'll try to give a generic answer without anything specific to us :- There are a few things that I'd need to know to give a definitive answer to your question, so I'll start by listing the assumptions I'm making -- leave me a comment if I'm wrong with any of them and I'll update the answer appropriately.

I'm assuming that the files you're uploading aren't huge and can fit into a reasonable amount of memory -- let's say, smaller than a megabyte. I'm assuming that the program that you've already written to generate the CSV from the text file is in Python, and that it has or, perhaps more likely, could be easily changed to have a function that takes a string containing the contents of the text file, and returns the contents that need to be written into the CSV. If I were doing it properly then I'd put the stuff that's generated by the form view into a template, but that's all.

Can you do it by writing to files -- yes you can, and the uploaded file can be saved by using the save filename method on the file object that I'm using the stream property of. But if your files are pretty small as per my assumption above then it probably makes more sense to process them in-memory like the code above does. I hope that all helps, and if you have any questions then just leave a comment. Improve this answer. We check the name of the uploaded file before we save it to server filesystem.

This is done because there is a possibility that user might name the file which clashes with some system configuration file, In this case if uploaded filename is not changed then system file will be overwritten. This vulnerability can be used by hackers to hack the server. For this task i. First we should be able to read pdf file, for that we would use PyPDF2 module. I simply reduced the height of the page which cuts the watermark from the image. Improve this answer. It works, but I had issues with http browser cache which didn't retry to download and got same filename.

Gino Mempin Gino Mempin Mahmoud Bassyouni Mahmoud Bassyouni 31 4 4 bronze badges. Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password. Post as a guest Name. Email Required, but never shown. The Overflow Blog. To configure the maximum file size, we need to set the app. For example, if we want to limit the maximum size of the file to 1 Mb, we need to add the following line of code in our program.

After setting the maximum file size of the file in our python program, if we upload a file having a size of more than 1 Mb, then we will get the error as shown in the below image. While building a file uploader using Flask, we can also configure the file extensions that we want to upload. To configure the allowed file extensions, we need to create a list of allowed extensions and check the uploaded file extension in the list. The below code shows a practical illustration of the method.

In the above code, we create a function that will check the uploaded file extension and compare it with the allowed extensions. Till now, we have seen how to upload a single file to our server. But sometimes, we also want to upload multiple files to the server. See the below code for illustration. After creating the Html form, we need to make some changes to our Flask application file. First, copy the following Python code into your Flask app file. In the above code, we use python for loop to iterate over the list of files and then save each file one by one.

We can choose multiple files now and upload them at once to the server. We have seen how to upload files using Flask, but sometimes we also want to serve a file to the user. First, create an HTML template in the templates folder, named the file download. Now, we need to create our app. In our app. Then, copy and paste the following code in the app. After copying the above code, run the code by typing the command python app. If everything works fine and the server starts without any problem, we have created our file downloader.

If you click the download button present in the URL, then the file will start downloading.