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Hardik Sondagar
Hardik Sondagar

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How to use multiple versions of Python

My system has 2.7.6 as a default python version and most of my applications runs on it, but one project that I'm working with AWS IoT requires version 2.7.9.

I will show how to run multiple versions of python using pyenv.

Prerequisite

$ sudo apt-get update
$ sudo apt-get install -y make build-essential libssl-dev zlib1g-dev libbz2-dev \
libreadline-dev libsqlite3-dev wget curl llvm libncurses5-dev libncursesw5-dev \
xz-utils tk-dev libffi-dev liblzma-dev
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Install pyenv

Install pyenv with one-liner provided by the automatic installer.

$ curl -L https://raw.githubusercontent.com/yyuu/pyenv-installer/master/bin/pyenv-installer | bash
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Add following lines at the end of .bashrc file and restart the terminal.

export PATH="/root/.pyenv/bin:$PATH"
eval "$(pyenv init -)"
eval "$(pyenv virtualenv-init -)"
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Note : For zsh use .zshrc file.

Usage

Install python version 2.7.9.

$ pyenv install 2.7.9
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List all installed python versions.

$ pyenv versions
* system (set by /home/ubuntu/.pyenv/version)
  2.7.9
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Use 2.7.9 version for your project.

$ mkdir aws-iot-mqtt
$ cd aws-iot-mqtt
$ pyenv local 2.7.9
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Now, verify which python version is enabled for current directory.

// Inside `aws-iot-mqtt` directory
$ python -V
Python 2.7.9
// Check version in parent directory
$ cd ..
$ python -V
Python 2.7.6
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Note: Tested on Ubuntu 16.04 server edition

Discussion (7)

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tux0r profile image
tux0r

If you are on Windows, you can get pyenv over pip (as long as you don't plan to use Python 3 with it).

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rhymes profile image
rhymes • Edited on

It's probably safer to use Windows Subsystem for Linux for that although it's not a real solution

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hardiksondagar profile image
Hardik Sondagar Author

Windows + Linux Bash = Perfect Combination

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tux0r profile image
tux0r

Except that it breaks your workflow because C:\ is suddenly /mnt/c/.

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tux0r

It's probably safer to use Windows Subsystem for Linux for that

Why?

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rhymes profile image
rhymes • Edited on

Because Windows is not supported by pyenv but you can use it inside the sub system being a Linux compatible environment

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ishands profile image
Ishan Das Sharma

pipenv is a cross-platform solution to the same thing. You should check it out