Temperature retention: A thermos should keep iced or hot coffee as close to the original temperature as possible for multiple hours. Double-walled or vacuum-sealed thermoses are the best at retaining temperature but can be heavy. Capacity: Bigger capacity means more contents to enjoy. It also means more weight to carry, but only if you fill it to the brim. For best insulation, buy a flask that’s slightly bigger (but not heavier) than you need, and leave a couple of centimetres of air at the top. We’ve included capacity and weight info for all our flasks below. For Linux users, on the other hand, Python2 is mostly installed by default, but to upgrade to the latest version, go through the official documentation. Installing a virtual environment

A route is a function that is associated with a URL. When a user visits the specified URL, the associated function is executed. In Flask, we use the @app.route decorator to define a route. The first argument of the route decorator is the URL that the function should be associated with. @app.route("/")Multi-wall insulation: Double-wall insulation creates a vacuumed layer, which is vital for keeping hot drinks hot and cold drinks cold. Some flasks include more layers for even better insulation. The 100% stainless steel construction of today’s flasks means there’s no risk of inner walls shattering when dropped. A solid performer in testing, SHO’s food flask kept water chilled for the advertised 20 hours and even managed to keep a portion of ice cream very cold, albeit a little melted, for the same period of time. Similarly, it kept hot food such as pasta piping hot over a period of 10 hours. The flask’s design also proved practical as well as stylish, with neat touches including a handy foldable spork, which stores in its lid, and a rubber carry handle. While the 530ml version is suitable for single portions, those of you looking to share may want to opt for the more roomy 800ml option. Other models we tested didn't have such robust handles, if any at all, either. Once thermoses get up to the 1.5-to-2-quart size, a handle becomes appreciated if not required. The smaller model's handle sits more flush, folding almost flat on a series of small hinges.

There is no US-based thermos company so instantly recognizable as Stanley, and the brand was among the first to bring double-walled, vacuum-sealed technology to the industry. Stanley's Classic Legendary Bottle holds heat and cold just as well as other top thermoses while staying affordable and nearly as reliable as the higher-tech, modern-day competition. Made from stainless steel and incorporating double-walled, vacuum insulation, the Rambler keeps drinks hot or cold for several hours at a time and holds up to wear and tear. Ease of use and cleaning: Even if a thermos offered great heat retention, if they required heavily involved disassembly and reassembly, and/or weren't dishwasher-safe, we took this into consideration. We don't want to spend our precious time disassembling thermos lids to rid them of bacteria. You may have a project that requires the use of SQLAlchemy in your Flask application, but you don’t want this particular dependency to be a global one in every project.The only other potential disadvantage is that the lid is somewhat complex, and that means there are working parts and compartments that can invite mold. Disassemble and clean it regularly, and you won't have any trouble. The Stanley Classic Trigger Action Travel Mug automatically reseals so you won't have to worry about whether you remembered to close it. A virtual environment is designed to allow you to work on multiple projects that require diverse dependencies. From the root of the application with the virtualenv active, run (using your own file name from the previous section): python instructables-flask-proj.py

A virtual environment is a tool that helps keep the dependencies required in different projects separate. Temperature: We tested temperature retention every two hours (previously, we tested hourly for this guide to travel mugs) starting 136 degrees Fahrenheit, the optimal temperature for hot beverages according to this study by the University of Texas. Once temperatures fell below 110 degrees, we stopped testing. Ultimately, the more you open your thermos, the faster it will cool, which will more likely be the determining factor regarding how long your coffee stays hot.. Zojirushi is a little on the pricey side, but the trusty lid, built-in silicone gasket for easy cleaning, excellent heat retention, and lightweight answer promptly for that. Lightweight with a slim and sturdy loop, the Hydro Flask is perfect for attaching to your bag so you never leave it behind.

Insulated cup: Good flasks also pay attention to the insulation of the detachable cup, if they have one. This is so your drink stays warm while you’re drinking it. Meanwhile, the outside stays cool, so you don’t risk burnt hands. Second, due to the plunger running through the lid, heat retention isn't generally as good as with lids that don't have holes running through their center. But four hours of hot coffee is still better than other travel french presses offer. The built-in LED touchscreen controls the temperature of your beverage to the degree between 120 and 145 degrees Fahrenheit (50-62.5 Celsius). There's probably no other way to keep the temperature of your beverage so constant for so long.

Available in 1.5- and 2-quart capacities, Stanley's Classic Legendary thermos lets you bring enough to share. It’s 100% leak proof – no matter how hard we tried, we couldn’t get any liquid to escape and the automatic opening trigger means you can drink from it one-handed with ease. Finally, there’s an additional loop handle on top so it can easily be attached to bags or simply carried this way. All in all, this is brilliantly stylish and robust We could use the analogy of a compact home library (when talking about Flask), while Django would be more of a state library. The point here is that, when you intend to build apps that have minimal functionality, Flask is one of the best choices. Apart from the loop, the Hydro Flask thermos is simple and effective. The lid twists open both for drinking and disassembly, there are no funny mechanisms that require a pipe cleaner to sanitize, and the smooth rim is a delight to drink from.A Thermos King will last years but it’s not officially dishwasher-safe, and you’re not even meant to submerge it in water (if you do, you kill the manufacturer’s 50-year guarantee). Inquisitive users report that it does survive the dishwasher intact, albeit with peeling colour. Below is an example main file which you should be able to use in your application. from Flask import flask Ember also maintains an application that allows you to create presets for your favorite beverages, if you like your latte at one temperature and your Americano at another. While three hours of battery life may not sound like a long time, it also has an "auto-sleep" function, and you can cheat by leaving the battery off at first while your beverage is freshly hot. NOTE: Unlike the previous sections, you must use a terminal to run the application instead of it being recommended.