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45 changes: 27 additions & 18 deletions Python-Virtualenv.md
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Original file line number Diff line number Diff line change
Expand Up @@ -8,19 +8,24 @@ Python Install
For comprehensive and up to date instructions for OSX installs look [here](http://docs.python-guide.org/en/latest/starting/install/osx/) but for simple cases the instructions below should help.

To install ``python3`` on OSX use
> brew install python3
```
brew install python3
```

or if ``python3`` is not supported by a required library use python 2.7

> brew install python
```
brew install python
```

On Debian and Ubuntu

> sudo aptitude install python3.5-dev

```
sudo aptitude install python3.5-dev
```
On Fedora

> sudo yum install python3.5-dev
```
sudo yum install python3.5-dev
```

Pip
---
Expand All @@ -33,20 +38,21 @@ Install or Upgrade pip
To install or upgrade pip, securely download [get-pip.py](https://bootstrap.pypa.io/get-pip.py). [[1](http://www.pip-installer.org/en/latest/installing.html#id5)]

Then run the following (which may require administrator access):

> $ python get-pip.py

```
$ python get-pip.py
```
If setuptools (or distribute) is not already installed, get-pip.py will install [setuptools](https://pypi.python.org/pypi/setuptools) for you. [[2](http://www.pip-installer.org/en/latest/installing.html#id6)]


On Debian and Ubuntu:

> $ sudo aptitude install python3-pip

```
$ sudo aptitude install python3-pip
```

On Fedora:

> $ sudo yum install python3-pip
```
$ sudo yum install python3-pip
```

If you need to use python 2.7 just remove the 3 from the commands.

Expand All @@ -57,10 +63,13 @@ Virtualenv is a tool that allows projects to have isolated environments on the s

Once you have virtualenvwrapper installed you can start a new virtualenv like so

> mkvirtualenv -p `which python3` --no-site-packages project_name

```
$ mkvirtualenv -p `which python3` --no-site-packages project_name
```
or if you have to use python 2

> mkvirtualenv -p `which python` --no-site-packages project_name
```
$ mkvirtualenv -p `which python` --no-site-packages project_name
```

The ``--no-site-packages`` option means that none of the system versions of your requirements will be used, which greatly decreases the risk of unexpected conflicts.