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Regular expressions

#regex #pyregex #re
test here

import re  
e = re.compile(r'some re')  
e.search(text).group(0) #returns strings  
e.match(text) #return object info about positions or None  
e.split(text) #split by regex
  • . any char except \n
  • ^ start of the line
  • $ end of the line
  • * 0+ times
  • + 1+ times
  • ? 0 or 1 times
  • {m} m times
  • {m, n} from m up to n times
  • Q? where Q is a quatifier, is non greedy
  • \ escape special character
  • [] set
  • reg1|reg2 OR
  • (reg) group
  • \w = [a-zA-Z0-9_]

Base64

import base64  
encoded = base64.b64encode('data to be encoded')  
encoded == 'ZGF0YSB0byBiZSBlbmNvZGVk'  
data = base64.b64decode(encoded)  
data == 'data to be encoded'

ASCII

ord('a') == 97  
chr(97) == 'a'

Shell

#bash #cmd #sh

>>> import subprocess  
>>> result = subprocess.run(['ls', '-l'], stdout=subprocess.PIPE)  
>>> result.stdout  
b'total 0\n-rw-r--r--  1 memyself  staff  0 Mar 14 11:04 files\n'  
>>> result.stdout.decode('utf-8')  
'total 0\n-rw-r--r--  1 memyself  staff  0 Mar 14 11:04 files\n'

Modules

ctypes #built-in, c extensions

pyglet
PIL - Pillow
pyinstaller
openpyxl
modernize
python-docx
lxml - http://www.lfd.uci.edu/~gohlke/pythonlibs/#lxml
mammoth - docx to html
requests
statistics
uuid #generate unique number
plotly
numpy #matrix
rsa
pyopenssl
feedparser #rss feed reader
json
pickle
dis

selenium #headless browser

pyqt5 --> pyqt4 through .whl file
Ghost.py #headless browser

pybox2d

conda -- https://conda.io/miniconda.html
swig -- c/c++ + another languages -- needed -- http://www.swig.org/download.html
visual tools -- http://landinghub.visualstudio.com/visual-cpp-build-tools
bug -- https://stackoverflow.com/questions/14372706/visual-studio-cant-build-due-to-rc-exe
pyBox2D -- https://github.com/pybox2d/pybox2d/blob/master/INSTALL.md

Flask

#web #serverside

from flask import Flask  
app = Flask(__name__)  
  
@app.route("/")  
def hello():  
    return "Hello World!"  
pip install Flask  
FLASK_APP=hello.py flask run  
 * Running on http://localhost:5000/

Running Apache server with Flask app

apt install apache2  
pip3 install mod_wsgi-httpd  
pip3 install mod_wsgiexport APACHE_RUN_DIR  
  
# on debian  
# alternatives on https://modwsgi.readthedocs.io/en/develop/user-guides/quick-installation-guide.html#restart-apache-web-server  
invoke-rc.d apache2 stop  
invoke-rc.d apache2 start  
mod_wsgi-express  
mod_wsgi-express setup-server --user www-data --group www-data --application-type module  --entry-point /var/www/flask_hello_app/hello.py --port 80  
mod_wsgi-express start-server  
runuser -l  apache -c 'mod_wsgi-express start-server'  
  
APACHE_RUN_DIR="/var/www/flask_hello_app"  
export APACHE_RUN_DIR  
  
  
# Invalid ProxyPass  
sudo a2enmod proxy  
sudo /etc/init.d/apache2 restart  
  
gunicorn server:app  
  
/etc/init.d/lighttpd stop  
/etc/init.d/lighttpd start  
/etc/init.d/lighttpd restart

Runing Flask with gunicorn and nginx

apt update
apt upgrade
apt install python3-pip
pip3 install gunicorn
pip3 install flask

screen -S web
gunicorn index:app

vim /etc/nginx/conf.d/virtual.conf

server {
    listen       80;
    server_name  jsem.tk;

    location / {
        proxy_pass http://127.0.0.1:8000;
    }
}

service nginx restart

https://medium.com/ymedialabs-innovation/deploy-flask-app-with-nginx-using-gunicorn-and-supervisor-d7a93aa07c18

apt install python-certbot-nginx
certbot --nginx

Sublime

Tools -> Build System -> New Build System

Windows style

{
 "cmd": ["/usr/local/bin/python3", "-u", "$file"],
 "file_regex": "^[ ]File \"(...?)\", line ([0-9]*)",
 "selector": "source.python"
}

Linux style

{
 "cmd":["C:/Users/<user>/AppData/Local/Programs/Python/Python37-32/python.exe", "-u", "$file"],
 "file_regex": "^[ ]File \"(...?)\", line ([0-9]*)",
 "selector": "source.python"
}

https://medium.com/@hariyanto.tan95/set-up-sublime-text-3-to-use-python-3-c845b742c720

Virtual env

python3.8 -m venv my_app_venv
source my_app_venv/bin/activate
python --version
deactivate

Package developement

pip install -e ./

update all apckages

pip3 list --outdated --format=freeze | grep -v '^\-e' | cut -d = -f 1 | xargs -n1 pip3 install -U