Python

Links

• Homepage
• [https://peps.python.org/pep-0008/ PEP 8 – Style Guide for Python Code=

Documentation

• Python 3 documentation

Tutorials

• w3schools
• https://www.tutorialspoint.com/python
• Beginners guide

HOWTO

virtual environment (venv)

Create virtual environment

• https://realpython.com/python-virtual-environments-a-primer/

python -m venv myvenv

and to activate that

source myvenv/bin/activate

and then you can

pip install whatever

Leave venv

deactivate

Listen on http

Python http server

python3 -m http.server 8080

Leave virtual environment

deactivate

Link python to python3 on Ubuntu

update-alternatives --install /usr/bin/python python /usr/bin/python3 1

Time/datetime

Seconds to time

from datetime import timedelta
myt = timedelta(seconds = 1000)
print(myt)

Print

Print with decimals

first = 2
second = 3.1415
print("First: {} second {:.2f}".format(first,second))

Regex

• Python Regex

Strings

Length of string

len(s)

Regular expressions

https://docs.python.org/3/library/re.html

FAQ

Leave virtualenv

deactivate

Python shebang

#!/usr/bin/env python3

-bash: python: command not found

Try

update-alternatives --config python

update-alternatives: error: no alternatives for python

update-alternatives --install /usr/bin/python python $(which python3) 1