vadym-khodak / python-mentoring

Python Mentoring

How to Start

How to find Terminal on MacOS?

Command + Space and then type Terminal

How to get current Python version in Terminal?

python --version

How to install pyenv on MacOS?

brew install pyenv

How to install necessary Python version in pyenv?

pyenv install <necessary python version> 

necessary python version is something like that: 3.8.0, 3.6.5, 2.7.3, etc

How to install pyenv-virtualenv?

brew install pyenv-virtualenv

How to install virtualenv using pyenv?

pyenv virtualenv <necessary python version> <virtualenv name>

necessary python version is something like that: 3.8.0, 3.6.5, 2.7.3, etc

virtualenv name is any string, something like that: test, pet_project, my_app, etc.

if you get this error:

Failed to activate virtualenv.

Perhaps pyenv-virtualenv has not been loaded into your shell properly. Please restart current shell and try again.

you will need to add these two rows to .bashrc:

eval "$(pyenv init -)"
eval "$(pyenv virtualenv-init -)"

How to do it?

• run this command in terminal:

sudo open ~/.bashrc

• Paste these two lines at the end of .bashrc file
• Restart your terminal or reload .bashrc file by executing this command source ~/.bashrc

How to activate virtualenv using pyenv?

pyenv activate <virtualenv name>

How to deactivate virtualenv using pyenv?

pyenv adectivate 

How to run Python interpreter?

python

How to close Python interpreter?

Control + D

How to run Python file from Terminal?

python <path to python file> (~/Desktop/hello.py)

Note: All Python files should have extension py.

Python

Functions:

• print(arg) - print value of arg variable in terminal

Data Types:

str - string. Strings should be wrapped in single quote 'or in double quotes " or in three single quotes ''' or in three double quotes """

Examples of str:

'Hello World'

"Hello World"

'''Hello 
World'''

"""Hello 
World"""

It is possible to concatenate (add) strings

>>>print('Hello' + ' ' + 'World')
'Hello World'