Virtualenv & Switching Versions

If you are having issue using tools that require diferent python version then this i for you 😄

Automate the Conversion from Python2 to Python3

Taken from geekforgeeks.

Installation

This module does not come built-in with Python. To install this type the below command in the terminal.

pip install 2to3

Syntax:

2to3 [file or folder] -w

If we want to change all files in the currently open folder and all the files in the subfolder from Python2 to Python3 type the below command.

2to3.-w

If we want to change a particular file in the current folder from Python2 to Python3 then enter the following command.

2to3 gfg.py -w

Virtualenv

Blog1 env

Blog2

First install python2

sudo apt install python2

Basic Usage

1. Create a virtual environment for a project:

$ cd project_folder
$ virtualenv venv

virtualenv venv will create a folder in the current directory which will contain the Python executable files, and a copy of the pip library which you can use to install other packages. The name of the virtual environment (in this case, it was venv) can be anything; omitting the name will place the files in the current directory instead.

This creates a copy of Python in whichever directory you ran the command in, placing it in a folder named venv.

You can also use the Python interpreter of your choice (like python2.7).

$ virtualenv -p /usr/bin/python2.7 venv

or change the interpreter globally with an env variable in ~/.bashrc:

$ export VIRTUALENVWRAPPER_PYTHON=/usr/bin/python2.7

1. To begin using the virtual environment, it needs to be activated:

$ source venv/bin/activate

Install packages using the pip command:

pip install requests

deactivate

This puts you back to the system’s default Python interpreter with all its installed libraries.

To delete a virtual environment, just delete its folder. (In this case, it would be rm -rf venv.)