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https://github.com/CrispenGari/python-and-flask

💎 A quick start for web server development using python flask.
https://github.com/CrispenGari/python-and-flask

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💎 A quick start for web server development using python flask.

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README 

        
### Python and Flask



This repository contains various flask applications examples for creating API's and Web Applications using python and flask.






































### Creating a virtual environment



There are two ways of creating a virtual environment in python.



1. creating a virtual environment from a already exists folder.



- to create a virtual environment in the existing folder you first need to navigate to the folder that you wnt to create virtual environment by running the command:



```shell

cd myv

```



- then you run the following command to create a virtual environment



```shell

virtualenv .

```



> This just means create a virtual environment in the current directory.



2. creating a virtual environment and naming it.



- to create a virtual environment by name you run the following command:



```shell

virtualenv venv

```



### Activating virtual environment



To activate virtual environment you have to run the `activate.bat` file that will be generated in virtual environment that you have created for example:



```shell

.\venv\Scripts\activate

# or

.\venv\Scripts\activate.bat

```



> Activating the first virtual (myv) you will do it as follows:



```shell

.\Scripts\activate

# or

.\Scripts\activate.bat

```



### Deactivating virtual environment



To deactivate virtual environment you have to run the `deactivate.bat` file that will be generated in virtual environment that you have created for example:



```shell

.\venv\Scripts\deactivate

# 1.

.\venv\Scripts\deactivate.bat

```



> Activating the first virtual (myv) you will do it as follows:



```shell

.\Scripts\deactivate

# 1.

.\Scripts\deactivate.bat

```



> I reccomment to navigate to the project directory after creating a virtual environment before installing packages:



```shell

📁 root

    📁 venv

```



To install the packages after activating the virtual environment you just run the following command:



```shell

pip install 



# example



pip install numpy

```



### Getting an error?



If you are getting a command error that says:



```shell

'virtualenv' is not recognized as an internal or external command,

operable program or batch file.

```



You could try to install `virtualenv` using pip as follows:



```shell

pip install virtualenv

```



Or



```shell

python -m pip install virtualenv

```



### Installing Flask



```shell

pip install flask

```



### Hosting Flask App.



In this section we are going to have a look at how we can deploy a flask static site. First you need to install `frozen-flask`.



> Frozen-Flask freezes a Flask application into a set of static files. The result can be hosted without any server-side software other than a traditional web server.



```shell

pip install Frozen-Flask

```



We are going to create a `build.py` file. This is where we are going to write the code for building the app using `frozen-flask`. The script for building a static flask app is as follows:



```py

from app import app

from flask_frozen import Freezer



freezer = Freezer(app=app, with_static_files=True)

if __name__ == '__main__':

    freezer.freeze()

```



Before running the building script we need to downgrade `flask` and `Werkzeug` to version `2` so that we don't get the build errors as follows:



```shell

pip install flask==2.1.2 && pip install Werkzeug==2.3.1

```



To generate the build we will need to run the following command:



```shell

python build.py

```



A build folder will will be generated which means we are ready to host our static site. First things first we need to generate a `requirements.txt` file by running the following command:



```shell

pip freeze > requirements.txt

```



After that we are going to then commit our project to `GitHub`. Then we can host our static site on the following cloud services:



1. [Netlify](https://www.netlify.com)

2. [Cloudflare](https://www.cloudflare.com/)

3. [GitHub Pages](https://pages.github.com/)

4. [GitLab Pages](https://docs.gitlab.com/ee/user/project/pages/)



### Hosting on Netlify



First you need to create a [Netlify](https://www.netlify.com) account.



1. When authenticated you will need to select an option on the Dashboard that says **`Import From Git`**.

2. Then select `Deploy With GitHub`

3. Select the `GitHub` project that you want to deploy.

4. Specify the base directory to `/`

5. Set deploy branch to `main`

6. And you need to specify the build command to `python3 build.py`

7. Since a set of static files (HTML, CSS, JavaScript) are being deployed, only the `Publish directory` needs to be specified as the path to the set of static files: `/build`

8. Click the `deploy` button then your site will be deployed.



### Links



1. [Frozen-Flask](https://pythonhosted.org/Frozen-Flask/)

2. [static-site-flask-and-netlify](https://testdriven.io/blog/static-site-flask-and-netlify/)