python-examples

This repository covers python basic foundations with examples and helps to understand the nuts and bolts of the language.

The examples are based on 3.8.2 version

How to execute a python file from bash

python ./name_of_python_file.py

More detailed info on several different ways to execute the python from bash

• https://stackoverflow.com/questions/4377109/shell-script-execute-a-python-program-from-within-a-shell-script

Why do we need a virtual environment and how to create virtual environment

If you want your code to run in it's own virtual environment without depending on the OS virtual env or on other python interpreters then in those scenarios you need a virtual environment.

* python -m venv new_virt_env

Activate virtual environment

• source new_virt_env/bin/activate ( In Mac as /bin folder doesn't exists in windows)
• new_virt_env/Scripts/activate ( In windows - Just run this path to activate the virtual environment)

Deactivate virtual environment and Destroy virtual environment

• deactivate
• rm -rf new_virt_env/ ( Clean up all the files in the folder)

Pip installing and uninstalling new packages

* pip install selenium --user ( pass --user if pip install selenium fails)
* pip uninstall selenium
* pip uninstall selenium urllib3 ( to uninstall multiple packages)

Upgrading pip

Upgrade pip if any of the package doesn't get installed in the virtual env

* python -m pip install --upgrade pip

Other pip commands

* pip --help
* pip freeze ( Outputs the installed packages using pip)
* pip freeze > requirements.txt
* pip install -r requirements.txt ( Install required packages)