DSTI_Workshop

Python Tutorial

Activate script execution in powershell

Open powershell as administrator and execute the following command

Set-ExecutionPolicy unrestricted

the accepte all by typing A

Istalling Python

Chose the python version that you want (recomended are 3.7 or 3.8) https://www.python.org/downloads/windows/ Download and install python

Python will install automatically pip which is a tool that help install python packages

Create Virtual Environment (Optional, for better code management)

Install virtualenv

Virtualenv is a tool that help python developper manage virtual environement for a better python libraries dependencies management

more information here https://virtualenv.pypa.io/en/stable/user_guide.html#introduction

to install virtualenv all you need to do is to run the following commande on your commande line tool

pip install virtualenv 

Create a virtual environment

To create a virtual environment you need to be in the directory of your workspace then run the following comand by replace myenv with the ame you want to give to your virtual environement

virtualenv myenv

for example, on Windows

PS C:\Users\yassi\MyWorkSpace> virtualenv myenv                                                                                                                                                                                              created virtual environment CPython3.8.6.final.0-64 in 1153ms
  creator Venv(dest=C:\Users\yassi\MyWorkSpace\myenv, clear=False, global=False, describe=CPython3Windows)
  seeder FromAppData(download=False, pip=bundle, setuptools=bundle, wheel=bundle, via=copy, app_data_dir=C:\Users\yassi\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.8_qbz5n2kfra8p0\LocalCache\Local\pypa\virtualenv)
    added seed packages: pip==20.2.4, setuptools==50.3.2, wheel==0.35.1
  activators BashActivator,BatchActivator,FishActivator,PowerShellActivator,PythonActivator,XonshActivator
PS C:\Users\yassi\MyWorkSpace> .\myenv\Scripts\activate      

If this does not work you can try

python -m virtualenv myenv

to activate the virtual environment

On Windows

./myenv/Scripts/activate

example

PS C:\Users\yassi\MyWorkSpace> .\myenv\Scripts\activate
(myenv) PS C:\Users\yassi\MyWorkSpace>

On Linux and MacOS

source myenv/bin/activate

(myenv) this means that you are in your virtual environment named myenv

once you are in your virtual environment, you can install the packages you will be needing for your project.

At the end of your project

to deactivate the virtual environment you can run the following command

deactivate

Installing essential packages

To install a package, you run the command pip install package-name replaceing package name by the package you want to install

The necessary packages for data science are the following

• numpy (for array data)
• pandas (to deal with tables)
• matplotlib
• jupyter ( or jupyterlab if you want to be fancy)
• seaborn (for beautifull plots)
• scipy (for scientific calculation)
• scikit-learn (for machine learning algorithms)
• tqdm ( for some fancy progress bars)

If you want to install all those libraries in one command :

• create a txt file that you can name requirements.txt in your working directory
• copy the name of libraries you want to install in that file and save it

numpy 
pandas
matplotlib
jupyter
seaborn
scipy
scikit-learn
tqdm

• run the following command pip install -r requirements.txt