Clicking on the link will ask user to save the file in a chosen location. The file type could be anything. 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? If you are not dynamically generating the file then why not use flask. Even if you were dynamically generating the best practice is to save the file to the disk and then serve it through Apache or nginx since web servers are much much more efficient at serving files than flask.
So they are not dynamically generated. KDawG I already tried to use flask. Add a comment. Active Oldest Votes.
Error Is used when a class is defined -- there is only a function here, and this isn't passed to the function, so its understandable that the reference to this doesn't make any sense here.
Sign up or log in Sign up using Google. Sign up using Facebook. Copy the following code into the app. In the above code, we first imported the required modules to our code. After importing the required modules, we initialize the Flask app by calling the Flask constructor. Next, we use python decorators to define the routes for our Flask app and serve the HTML template that we created.
Next, we use python decorators to accept the post request for the file and save the file. You can run the above code by just typing python app. We will see something as shown in the below image while running the above code.
Upload a sample file by choosing a file and clicking the submit button. After submitting the file, we will get a message showing that the file has been successfully uploaded. We can check the file in the server by visiting the root directory. We created a file uploader that saves the uploaded file in the root directory. 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. Create a project root directory called python-flask-upload-display-image as per your chosen location. I will configure application through flask framework. I will also define our file upload location and maximum size of the file a user can upload.
You should not allow user to upload unlimited size of file due to security reasons or to avoid exhausting server space. The standard directory for storing static resources such as images, css, javascript files into Flask application is to put under static directory.
Next I will create main.
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