Flask dynamic downloadable file

Tip - Trailing slashes matter in Flask. If you try to access a route that's not defined with a trailing slash in the URL, you'll get an error. You'll see Flask returns our new profile. We can now work with data that comes into our app from the URL!

Let's create a dictionary containing a few usernames and some information about our users. We'll search the dictonary for the username variable and return some basic information about that user. Let's create our users dictionary:. We'll add some logic to our profile route to look up the user and return their information:. Dynamic URL's aren't just limited to one variable. Let's stack some more veriables to capture in our URL string. In our first example, we created the profile route to expect only one variable in the URL.

However, we can add as many as we like. Sure, Google is doing But what if we wanted to create a paths for other locations, such as newyork and tokyo? Well, there's always copy and paste:. OK, you can see how trying to make multiple paths and routes gets out of hand, making our slim app. Before we move on to the next, most important phase — creating routes with variables in the path names — let's just do a little cleanup of the app. Remember that even though it's a web application, it's still just a Python script.

Note that the HTML for all of the different routes is basically the same thing, with just the change in the name of location:. We want to abstract it out as a reusable template. If you already know about web app development in other languages, then you may just want to jump to Jinja2 templating , which is the official way to do string templating with Flask apps.

Here's what that would look like in our current app. Helps to separate the things that don't change from the things that do change within a program's execution:. Note how much cleaner each view function looks, with most of the HTML code being taken out and moved to the top.

Almost all of the HTML is abstracted away. See if you can figure out an even more complete abstraction. Here's my solution below:. The main takeaway is that string templates are just a fancier way to deal with strings. The view functions are still returning strings, as we learned from the very first lesson. Of course, it's just not feasible for you, the developer, to enumerate every possible route that a user will want to try out, whether it be stanford or chicago or timbuktu.

This is where we get into the core of what makes a web application different from a regular web page: we program our app to accept variable paths. Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams? Collectives on Stack Overflow. Learn more. Render dynamically changing images with same filenames in Flask Ask Question.

Asked 3 years ago. Active 1 year, 3 months ago. Viewed 7k times. I have a flask view function as below: app. Improve this question. Karthick Mohanraj Karthick Mohanraj 1, 1 1 gold badge 9 9 silver badges 23 23 bronze badges. Though it doesn't work. Add a comment. Active Oldest Votes.

Improve this answer. Dinko Pehar Dinko Pehar 4, 3 3 gold badges 17 17 silver badges 39 39 bronze badges. Are u sure it is a valid python statement. Can you elaborate a bit more? I do not want to change the file names since I'm not willing to dump the memory.