Using Python decorators to add another layer of functionality to Flask routes. Home Articles Categories Series. Recommended learning Pluralsight Treehouse. Sending files with Flask Learning Flask Ep. Let's get started. Flask imports First up, we're going to need some imports from flask. The absolute path of the directory containing images for users to download app. Next article Flask cookies Learning Flask Ep.
Sign up to the Pythonise newsletter! Did you find this article useful? Yes No. Application factory pattern Learning Flask Ep. Custom Flask decorators Learning Flask Ep. Contents Loading We can also configure the directory for saving the file by configuring the app.
At first, the uploaded file is saved into a temporary location, and then it moves to the final location. The following code shows how to configure the upload directory. In the above code, we use the OS module of python to create a directory and saves every uploaded file to the created directory.
If we restart the server and upload a file to the server, the file will be uploaded to the created directory instead of the root directory. We can also configure the maximum upload size of the file. This is important because if the file is too large for the server, then the site may crash.
So, we need to always limit the upload size of the file according to our server. 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. For the above code to work properly, we need a file with the name sample. In this tutorial, we learned to create a file uploader and file downloader using the Flask library.
In addition, we have seen how to configure the max size and extension of the file upload. You may also want to see our step-by-step guide on creating a Flask app in python. How to upload a file with a python script? How to make it so you can acess it not only on the local network? Save my name, email, and website in this browser for the next time I comment. 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? Your email address will not be published. Roy Tutorials Technical… Theoretical… Practical…. Introduction Here I am going to show a simple example on how to download a file from web application using Python Flask. Prerequisites Python 3. Project Directory First step is to create a project root directory under which I will put all the required files for the project.
Configuring Flask Create the below app. UI Template Now create a download. Testing the Application Now navigate to the project root directory from command line tool and execute the command python main.
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