Converted python versions to book variable

Author: nikhiljohn10

en/chromebook_setup/instructions.md

@@ -74,7 +74,7 @@ Run:
 ```
 mkdir djangogirls
 cd djangogirls
-python3.6 -mvenv myvenv
+python{{ book.py_version }} -mvenv myvenv
 source myvenv/bin/activate
 pip install django~={{ book.django_version }}
 ```

en/deploy/README.md

@@ -152,7 +152,7 @@ Deploying a web app on PythonAnywhere involves pulling down your code from GitHu
 
 {% filename %}PythonAnywhere command-line{% endfilename %}
 ```
-$ pip3.6 install --user pythonanywhere
+$ pip{{ book.pyaw_version }} install --user pythonanywhere
 ```
 
 That should print out some things like `Collecting pythonanywhere`, and eventually end with a line saying `Successfully installed (...) pythonanywhere- (...)`.
@@ -161,7 +161,7 @@ Now we run the helper to automatically configure our app from GitHub. Type the f
 
 {% filename %}PythonAnywhere command-line{% endfilename %}
 ```
-$ pa_autoconfigure_django.py --python=3.6 https://github.com/<your-github-username>/my-first-blog.git
+$ pa_autoconfigure_django.py --python={{ book.pyaw_version }} https://github.com/<your-github-username>/my-first-blog.git
 ```
 
 As you watch that running, you'll be able to see what it's doing:

en/django_installation/instructions.md

@@ -85,7 +85,7 @@ $ python3 -m venv myvenv
 >{% filename %}command-line{% endfilename %}
 >```
 >$ sudo apt install python-virtualenv
->$ virtualenv --python=python3.6 myvenv
+>$ virtualenv --python=python{{ book.py_version }} myvenv
 >```
 
 > __NOTE:__ If you get an error like
@@ -99,7 +99,7 @@ $ python3 -m venv myvenv
 >
 >{% filename %}command-line{% endfilename %}
 >```
->sudo apt install python3.6-venv
+>sudo apt install python{{ book.py_version }}-venv
 >```
 
 <!--endsec-->

en/python_installation/instructions.md

@@ -16,13 +16,13 @@ First check whether your computer is running a 32-bit version or a 64-bit versio
 
 You can download Python for Windows from the website https://www.python.org/downloads/windows/. Click on the "Latest Python 3 Release - Python x.x.x" link. If your computer is running a **64-bit** version of Windows, download the **Windows x86-64 executable installer**. Otherwise, download the **Windows x86 executable installer**. After downloading the installer, you should run it (double-click on it) and follow the instructions there.
 
-One thing to watch out for: During the installation, you will notice a window marked "Setup". Make sure you tick the "Add Python 3.6 to PATH" or 'Add Python to your environment variables" checkbox and click on "Install Now", as shown here (it may look a bit different if you are installing a different version):
+One thing to watch out for: During the installation, you will notice a window marked "Setup". Make sure you tick the "Add Python {{ book.py_version }} to PATH" or 'Add Python to your environment variables" checkbox and click on "Install Now", as shown here (it may look a bit different if you are installing a different version):
 
 ![Don't forget to add Python to the Path](../python_installation/images/python-installation-options.png)
 
 When the installation completes, you may see a dialog box with a link you can follow to learn more about Python or about the version you installed. Close or cancel that dialog -- you'll be learning more in this tutorial!
 
-Note: if you are using an older version of Windows (7, Vista, or any older version) and the Python 3.6.x installer fails with an error, you can try either:
+Note: if you are using an older version of Windows (7, Vista, or any older version) and the Python {{ book.py_version }}.x installer fails with an error, you can try either:
 1. install all Windows Updates and try to install Python again; or
 2. install an [older version of Python](https://www.python.org/downloads/windows/), e.g., [3.4.6](https://www.python.org/downloads/release/python-346/).
 
@@ -40,7 +40,7 @@ data-collapse=true ces-->
 You need to go to the website https://www.python.org/downloads/release/python-361/ and download the Python installer:
 
 * Download the *Mac OS X 64-bit/32-bit installer* file,
-* Double click *python-3.6.1-macosx10.6.pkg* to run the installer.
+* Double click *python-{{ book.py_release }}-macosx10.x.pkg* to run the installer.
 
 <!--endsec-->
 
@@ -52,10 +52,10 @@ It is very likely that you already have Python installed out of the box. To chec
 {% filename %}command-line{% endfilename %}
 ```
 $ python3 --version
-Python 3.6.1
+Python {{ book.py_release }}
 ```
 
-If you have a different version of Python installed, at least 3.4.0 (e.g. 3.6.0), then you don't have to upgrade. If you don't have Python installed, or if you want a different version, first check what Linux distribution you are using with the following command:
+If you have a different version of Python installed, at least 3.4.0 (e.g. {{ book.py_release }}), then you don't have to upgrade. If you don't have Python installed, or if you want a different version, first check what Linux distribution you are using with the following command:
 
 {% filename %}command-line{% endfilename %}
 ```
@@ -108,11 +108,11 @@ Verify the installation was successful by opening a command prompt and running t
 {% filename %}command-line{% endfilename %}
 ```
 $ python3 --version
-Python 3.6.1
+Python {{ book.py_release }}
 ```
-The version shown may be different from 3.6.1 -- it should match the version you installed.
+The version shown may be different from {{ book.py_release }} -- it should match the version you installed.
 
-**NOTE:** If you're on Windows and you get an error message that `python3` wasn't found, try using `python` (without the `3`) and check if it still might be a version of Python that is 3.4.0 or higher. If that doesn't work either, you may open a new command prompt and try again; this happens if you use a command prompt left open from before the Python installation. 
+**NOTE:** If you're on Windows and you get an error message that `python3` wasn't found, try using `python` (without the `3`) and check if it still might be a version of Python that is 3.4.0 or higher. If that doesn't work either, you may open a new command prompt and try again; this happens if you use a command prompt left open from before the Python installation.
 
 ----
 

en/python_introduction/README.md

@@ -19,7 +19,7 @@ We want to open up a Python console, so type in `python` on Windows or `python3`
 {% filename %}command-line{% endfilename %}
 ```
 $ python3
-Python 3.6.1 (...)
+Python {{ book.py_release }} (...)
 Type "help", "copyright", "credits" or "license" for more information.
 >>>
 ```