December 16
Data types in Python 3
Numbers
Integers: Like in math, integers in computer programming are whole numbers that can be positive, negative, or 0 (…, -1, 0, 1, …). An integer can also be known as an int. As with other programming languages, you should not use commas in numbers of four digits or more, so when you write 1,000 in your program, write it...
December 11
Simple Python Flask Rest API
Setup project folder:
$ mkdir flask-rest-api; cd flask-rest-api
$ python3 -m venv venv
$ source venv/bin/activate
Check your env, make sure it is the version that you should run on:
$ python -V; pip -V
Install flask and packages:
$ pip install flask flask-sqlalchemy marshmallow psycopg2-binary
Generate freeze requirement text file:
$ pip3 freeze > requirements.txt
Create your app.py file
$ touch app.py
Use any code editor to work on your project.
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December 10
Run your Python Flask app with existing Apache server
If you already have an EC2 with Apache, you can use it to run your Python Flask app.
Install and Enable mod_wsgi:
$ sudo apt-get install libapache2-mod-wsgi-py3 python-dev
$ sudo a2enmod wsgi
Create a Flask app if you don't have one. See my other blog for create / run flask app.
Configure and Enable a New Virtual Host:
$ sudo nano /etc/apache2/sites-available/MyFlaskApp.conf
Add the following conf code...
December 10
Install Flask on Ubuntu 18.04
Check your Python version:
$ python -V
$ python3 -V
Run your Flask app with python 3. You can set your defaul python with python3 if that is what you want with a simple HACK: $ sudo ln -s /usr/bin/python3 /usr/bin/python
Best to run your app in venv, install python venv if not in your system:
sudo apt install python3.x-venv
Create your project folder and create new virutal...
April 2
Python VirtualEnv HowTo
Create python virtualenv in a dir for python3
$ cd codefolder
$ python3 -m venv venv
(or, $ virtualenv -p python3 . )
Start your virtualenv again
$ source yourvenv/bin/activate
Exit python virtualevn
$ deactivate
Shorthand to create virtualenv and folder
$ virtualenv yourvenv -p python3
Install django
$ pip install django==3.1.5
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June 23
Creating a Stand Alone Executable from a Python Script using PyInstaller
1. go to https://www.pyinstaller.org/
2. install PyInstaller from PyPI
pip install pyinstaller
3. run pyinstaller --onefile -w if you want only one output file and without opening console terminal
pyinstaller --onefile -w yourscript.py
4. (for windows) if your program requires additional packages, you can use NSIS (Nullsoft Scriptable Install System) https://nsis.sourceforge.io/Main_Page. download and install it. (watch video above to see how to do it properly).
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