Check flask version

Check flask version DEFAULT

Determining what version of Flask is installed

How to check the version of Nginx using command line ? , How to check the computer model details from Windows command line ? ,Flask is one of the popular web frameworks in python. To check the version of the flask package installed in an environment, you can use one of the following methods., How to delete or remove a disk from a Linux system without reboot ?

Using python interpreter

import flask flask.__version__

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What's the easiest way to determine which version of Flask is installed?,Post installation check the version with command:, What is the physical reasoning behind metal becoming stronger and harder if heat treated? ,Type flask --version in your interpreter, for example: enter image description here

As of flask 0.7 (June 28th, 2011), a attribute can be found on the flask module.

>> import flask >> flask.__version__

For versions older than flask 0.7, you might be able to determine it using pkg_resources as shown below:

>>> import pkg_resources >>> pkg_resources.get_distribution('flask').version'0.6.1'

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As of flask 0.7 (June 28th, 2011), a __version__ attribute can be found on the flask module.,Keep in mind that because prior to flask 0.7 there was no __version__ attribute, the preceding code will result in an attribute error on those older versions.,For versions older than flask 0.7, you might be able to determine it using pkg_resources as shown below:,It will list all installed python packages and their versions. If you want to see just flask then try :

As of flask 0.7 (June 28th, 2011), a attribute can be found on the flask module.

>> import flask >> flask.__version__

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This will pull in the dependencies and activate the git head as the current version inside the virtualenv. Then all you have to do is run git pull origin to update to the latest version.,If you want to work with the latest version of Flask, there are two ways: you can either let pip pull in the development version, or you can tell it to operate on a git checkout. Either way, virtualenv is recommended.,Get the git checkout in a new virtualenv and run in development mode:,Once you have virtualenv installed, just fire up a shell and create your own environment. I usually create a project folder and a venv folder within:

$ sudo easy_install virtualenv

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Python 3 comes with a virtual environment module called venv preinstalled. If you have Python 3 installed, skip to Step 2.,Install Flask in a virtual environment to avoid problems with conflicting libraries. Check Python version before starting:,To create a virtual environment for Python 3, use the venv module and give it a name:,For Python 2, create the virtual environment with the virtualenv module:

2. Use to install virtualenv on Debian, Ubuntu and other related distributions:

sudo apt install python - virtualenv

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To install flask you can go here or just follow below steps:,If you needed to install virtualenv because you are on an older version of Python, use the following command instead: ,It is a good approach to create virtual environment whenever you start a new project. So that no two libraries cause conflict with each other.,Within the activated environment, use the following command to install Flask:

$ sudo apt - get install python - virtualenv $ sudo yum install python - virtualenv $ sudo pacman - S python - virtualenv

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Python 2 does not have a venv package. In this version of the Python interpreter, virtual environments are created with the third-party utility virtualenv.,After the command completes, you will have a subdirectory with the name venv inside flasky, with a brand-new virtual environment that contains a Python interpreter for exclusive use by this project.,The creation of virtual environments is an area where Python 3 and Python 2 interpreters differ. With Python 3, virtual environments are supported natively by the venv package that is part of the Python standard library.,Python packages are installed with the pip package manager, which is included in all virtual environments. Like the python command, typing pip in a command prompt session will invoke the version of this tool that belongs to the activated virtual environment.

To begin, you need to create the directory that will host the example code, which is available in a GitHub repository. As discussed in “How to Work with the Example Code”, the most convenient way to do this is by checking out the code directly from GitHub using a Git client. The following commands download the example code from GitHub and initialize the application to version , which is the initial version you will work with:

$ git clone https: $ cd flasky $ git checkout 1 a

If you prefer not to use Git and instead manually type or copy the code, you can simply create an empty application directory as follows:

$ mkdir flasky $ cd flasky

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In this tutorial, you’ll do the following:,If you got debug output instead, fix the errors and make sure the application is running locally before configuring it for Elastic Beanstalk. ,To terminate your Elastic Beanstalk environment,Open the Elastic Beanstalk console, and in the Regions list, select your AWS Region.

Create a project directory.

~$ mkdir eb - flask~$ cd eb - flask

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Other "determining-flask" queries related to "Determining what version of Flask is installed"


A Complete Guide on Installing Flask for Beginners

Flask is a popular micro web framework that provides you with tools, libraries, and technologies for building web pages, e-commerce applications, and much more. There is a common problem for beginners when selecting what framework to learn (for backend web development). The common choices for developers are Flask and Django. I recommend Flask for a beginner, because it is easier to learn and use.

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.

However, because of its extensibility, organizations like Netflix, Airbnb, Uber, Lyft, Mozilla, and MIT make use of Flask as one of the technologies when developing their web applications.

By the end of this tutorial, you will adequately understand the following:

  • How to install Flask.
  • How to install a virtual environment.
  • How to structure your web app.
  • Building and running a simple Hello World program.

Installing Flask

The Flask web framework is built on the Python programming language, thus, it will require that we install Python. Albeit, your system might have Python installed; to check if you have Python installed, open your terminal or cmd (in Windows) and type in the command:

If you have Python already installed, you should see the version appear in your terminal when you run either of the commands. If you don’t have Python installed, we will describe the installation process next.

Installing Python

The installation process of Python is quite easy. For windows users, visit the Python official website and download the .exe file. Launch the file and follow the installation process.

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 virtual environment is a tool that helps keep the dependencies required in different projects separate.

A virtual environment is designed to allow you to work on multiple projects that require diverse dependencies.

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.

A virtual environment would be ideal, as it gives you control over that.

To install your virtual environment, you need Pip installed.

What is Pip

Pip is a package manager for Python packages and modules. You can follow through the step-by-step process provided by the Python official documentation to install pip and a virtual environment.

Installing Flask

Now that you have Python, pip, and a virtual environment installed on your system. We can proceed to the installation of Flask itself.

This is a step-by-step process on how to install Flask:

Terminal and file directory

The first step is to create the flask_website directory:

Next, change directory to the flask_website directory created in the previous step:

Create a virtual environment and store its tools in the “env” folder:

By following the steps above, we have our virtual environment ready for our Flask app, next, we will activate it.

Running a virtual environment

To activate your virtual environment, from the directory of your folder, type the following command this will activate our virtual environment in the “env” folder as we demonstrated in the previous step.

If you have successfully activated your virtual environment, you should see the (env) word indicating that we are working in a virtual environment.

With all these completed, the fun part can now begin, what you’ve been waiting for, installing Flask!

Installing Flask

In this step, you will be installing the Flask web framework in our virtual environment specifically for the project being worked on.

Before you install Flask, I recommend you check your Python and Pip version just to confirm they are installed and activated in your virtual environment.

You can proceed to install Flask by running the following command:

Launching the workspace

For the scope of this article, we will be using Visual Studio Code here. Now, back to your terminal after installing Flask, run the subsequent command to launch VSCode in the current directory of the web application.

Now, let’s proceed to structure the web application.

Structuring your web application

The structuring of your web application is the first thing to do before delving into the coding process, and below is a diagrammatic representation of how your Flask app should be structured:

image for web application structure

The first process in structuring your web application is to create an “app” folder, a file and a “requirement.txt” file.

The “app” folder structure provides us with the flexibility of defining our Flask application as a package that could be imported in any part of the app that we would require.

The file will basically serve as a pointer to Flask, informing it about where the App itself is and thereby running it. Lastly, the “requirement.txt” file houses all packages used in the project.

To start off, head back to your terminal and run the following command to generate the “requirements.txt” file:

To see the packages in use open the “requirement.txt file". It shouldn’t be more than seven requirements.

Next, you should create the “app” folder and the file at the top level of your working directory.

The file

This file serves as a pointer to Flask, informing it about the existence of our application and to run the application. In this file, we start off by importing the app module from the app folder we created earlier, while this seems confusing, it will make sense soon.

Next, we write an “if” condition to run the app when we run the Flask server, by the end of this, your file should have a code that looks just like this:

The app folder

In the previous step, you wrote the necessary code for Python to execute the app when we run the Flask server.

In this step, we will completely structure the app folder, and to do that you need to create certain files and folders.

We start off by creating two folders and two Python files, which are: static folder, templates folder, and .

The file houses the code to initialize our Flask application and to import our views. In this file, we import Flask, and also create and app object which is an instance of the Flask class.

Lastly, we import the file from the app folder.

Your code in the file should look this way:

If you recall in the previous step we imported the app module from the app file, what we were basically doing was importing the app object in the init file. Let’s proceed by examining the file.

The file

The views file contains the routes to webpages and might also house logic for your web app. In our case, we’ll start with a function that returns a simple “Hello world’ message to our browser.

To achieve this add the code below to the file:

From the first line of code, we imported the app object from the app itself. Next, we define the route using the @app.route decorator, and passing the URL of the web page.

In this case, it’s the homepage and we use the backward slash to delineate that. Then let’s create an index() function that returns a simple hello world message.

At this stage we can run our application to see what it looks like on a web browser.

Running your application

Congratulations, you’ve made it this far, you can run your application by opening your terminal with the virtual environment active and run the following command line:

By executing the command, your Flask server should be running and you can click on the link to see if your application works.

If you’ve followed the process outlined here carefully, you should see hello world in your web browser.


By now you should be able to install Flask, structure your web application professionally, and create a web page with Flask that prints hello world in your web browser.

With this introduction, you can now build on it to create web applications.

You can find the full codebase for this article here.

Peer Review Contributions by: Adrian Murage

About the author

Adetu Ridwan

Adetu Ridwan is an economic analyst and a technical writer. He is interested in backend web development and mobile web applications.

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Flask is a lightweight WSGI web application framework. It is designed to make getting started quick and easy, with the ability to scale up to complex applications. It began as a simple wrapper around Werkzeug and Jinja and has become one of the most popular Python web application frameworks.

Flask offers suggestions, but doesn’t enforce any dependencies or project layout. It is up to the developer to choose the tools and libraries they want to use. There are many extensions provided by the community that make adding new functionality easy.


Install and update using pip:

$ pip install -U Flask

A Simple Example

# save this as app.pyfromflaskimportFlaskapp=Flask(__name__)@app.route("/")defhello():return"Hello, World!"$ flask run * Running on (Press CTRL+C to quit)


For guidance on setting up a development environment and how to make a contribution to Flask, see the contributing guidelines.


The Pallets organization develops and supports Flask and the libraries it uses. In order to grow the community of contributors and users, and allow the maintainers to devote more time to the projects, please donate today.


Flask version check

How to set up your Python and Flask development environment

In this guide, we’ll cover how to set up your Python development environment for a Flask project. We'll use virtual environments to isolate our dependencies, and for package management. Also, we'll talk about a couple of helpful tools that we recommend for prototyping Python applications that use Twilio: ngrok and the Twilio Python SDK.

Let’s get started!

Choose a Python version

There are two different versions of Python in widespread use today: Python 2 and Python 3. If you’re new to Python, choosing the right version for your project can be confusing.

Python 3 was first released in 2008, but some parts of the Python community continue to prefer Python 2 for various reasons. You can read more about the history of Python 2 vs. Python 3 here.

Twilio’s Python server-side SDK supports Python versions 3.6+.

If Python is already installed on your system, you can check its version by running .

Install Python

How you install Python varies depending on your operating system.

Install a text editor or IDE

Before we can start our Python project, we’ll need something to write it with.

If you already have a code writing tool of choice, you can stick with it for developing your Python application. If you're looking for something new, we recommend trying out a few options:

  • Sublime Text is a text editor popular for its ease of use and extensibility. Start here if you’re eager to get coding and don’t think you’ll want a lot of frills in your development environment.
  • Visual Studio Code is another text editor that's free, easy to set up, and available on all platforms.
  • PyCharm is a full Integrated Development Environment (IDE) for Python. It takes longer to set up but comes with more helpful tools already installed.
  • Python Tools for Visual Studio is a great option if you're already a Visual Studio user.
  • Vim is a perennial favorite text editor among advanced users

If you’re new to programming, we recommend giving Sublime Text and PyCharm each a try before you settle on your favorite.

Start a new project with virtualenv

Before starting any new Python project, we should create a virtual environment for it.

Virtual environments (shortened as "virtualenv") separate our new project’s Python dependencies from our other projects and from the Python libraries our operating system uses. If you don’t use a virtualenv, there’s a good chance you might break part of your OS.

If you have Python 3.3 or above you don't need to install anything – the standard library provides virtualenv under the module "venv".

If you have an older version, you'll need to install this Python utility which allows you to create and manage Python virtual environments. Use the command to create a new virtual environment, using its sole argument to name your new environment. The instructions to activate your new virtualenv vary by operating system:

You’ll need to activate your virtual environment every time you work on your Python project. In the rare cases when you want to deactivate your virtualenv without closing your terminal session, just use the command.

Install Flask and the Twilio Python SDK

We’re almost ready to start writing our Flask web application, but first we need to install the Flask library in our virtual environment.

Python uses pip to manage dependencies, so the command to pull Flask and the Twilio SDK into our development environment is .

After you get your dependencies installed and confirm they're doing the trick for you, you'll probably want to keep track of and control what versions of the dependencies you're using. Pip allows us to "freeze" our dependencies, and record which versions we are using in a file that (by convention) is called . Create a requirements file with this command:

If later on, you wish to install this same set of dependencies again, you can install them from this file with the following command:

Create a simple Flask application

We can test that our development environment is configured correctly by creating a simple Flask application. We’ll grab the nine-line example from Flask’s homepage and drop it in a new file called .

We can then try running our new Flask application with the command . You can then open http://localhost:5000 in your browser, and you should see the “Hello World!” response.

Note: If you’re using a virtual machine for your development environment, like vagrant, you might not be able to see your Flask application at the localhost host name. Continue on to the ngrok section for an easy way to fix this.

The Django Alternative

While Flask is a micro-framework that can be extended with various libraries, Django is another popular web framework that provides a lot more out of the box. If you're interested in using Django, we recommend following their guides to get started with it.

Install ngrok

Once you see your sample Flask application’s “Hello World!” message, your development environment is ready to go. But for most Twilio projects you’ll want to install one more helpful tool: ngrok.

Most Twilio services use webhooks to communicate with your application. When Twilio receives an incoming phone call, for example, it reaches out to a URL in your application for instructions on how to handle the call.

When you’re working on your Flask application in your development environment, your app is only reachable by other programs on the same computer, so Twilio won’t be able to talk to it.

Ngrok is our favorite tool for solving this problem. Once started, it provides a unique URL on the domain which will forward incoming requests to your local development environment.

To start, head over to the Ngrok download page and grab the binary for your operating system:

Once downloaded, make sure your Flask application is running and then start Ngrok using this command: "./ngrok http 5000". You should see output similar to this:

ngrok screen

Look at the “Forwarding” line to see your unique Ngrok domain name (ours is "") and then point your browser at that domain name.

If everything’s working correctly, you should see your Flask application’s “Hello World!” message displayed at your new Ngrok URL.

Anytime you’re working on your Twilio application and need a URL for a webhook you should use Ngrok to get a publicly accessible URL like this one.

Where to next?

Nicely done! You've learned about , and virtual environments, and you’re now ready to build out your Flask application.

Ready to build something more substantiate with Twilio? Here are a few other resources we like:




Need some help?

We all do sometimes; code is hard. Get help now from our support team, or lean on the wisdom of the crowd by visiting Twilio's Community Forums or browsing the Twilio tag on Stack Overflow.

Get Form Checkbox Data in Flask With .getlist


Virtual environments¶

Use a virtual environment to manage the dependencies for your project, both in development and in production.

What problem does a virtual environment solve? The more Python projects you have, the more likely it is that you need to work with different versions of Python libraries, or even Python itself. Newer versions of libraries for one project can break compatibility in another project.

Virtual environments are independent groups of Python libraries, one for each project. Packages installed for one project will not affect other projects or the operating system’s packages.

Python comes bundled with the module to create virtual environments.

Create an environment¶

Create a project folder and a folder within:

$ mkdir myproject $ cd myproject $ python3 -m venv venv
> mkdir myproject > cd myproject > py -3 -m venv venv

Activate the environment¶

Before you work on your project, activate the corresponding environment:

> venv\Scripts\activate

Your shell prompt will change to show the name of the activated environment.

Install Flask¶

Within the activated environment, use the following command to install Flask:

Flask is now installed. Check out the Quickstart or go to the Documentation Overview.


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