Merge pull request DjangoGirls#1225 from jacebrowning/advance-error-n…

…otice

Include a warning icon before blocks that return errors

en/extend_your_application/README.md

@@ -1,3 +1,5 @@
+{% set warning_icon = '<span class="glyphicon glyphicon-exclamation-sign" style="color: red;" aria-hidden="true" data-toggle="tooltip" title="An error is expected when you run this code!" ></span>' %}
+
 # Extend your application
 
 We've already completed all the different steps necessary for the creation of our website: we know how to write a model, url, view and template. We also know how to make our website pretty.
@@ -30,7 +32,7 @@ We will start with adding a link inside `blog/templates/blog/post_list.html` fil
 
 {% raw %}We want to have a link from a post's title in the post list to the post's detail page. Let's change `<h1><a href="">{{ post.title }}</a></h1>` so that it links to the post's detail page:{% endraw %}
 
-{% filename %}blog/templates/blog/post_list.html{% endfilename %}
+{% filename %}{{ warning_icon }} blog/templates/blog/post_list.html{% endfilename %}
 ```html
 <h1><a href="{% url 'post_detail' pk=post.pk %}">{{ post.title }}</a></h1>
 ```
@@ -53,7 +55,7 @@ We want our first post's detail to be displayed at this **URL**: http://127.0.0.
 
 Let's make a URL in the `blog/urls.py` file to point Django to a *view* named `post_detail`, that will show an entire blog post. Add the line `url(r'^post/(?P<pk>\d+)/$', views.post_detail, name='post_detail'),` to the `blog/urls.py` file. The file should look like this:
 
-{% filename %}blog/urls.py{% endfilename %}
+{% filename %}{{ warning_icon }} blog/urls.py{% endfilename %}
 ```python
 from django.conf.urls import url
 from . import views
@@ -85,7 +87,7 @@ This time our *view* is given an extra parameter, `pk`. Our *view* needs to catc
 
 Now, we want to get one and only one blog post. To do this, we can use querysets, like this:
 
-{% filename %}blog/views.py{% endfilename %}
+{% filename %}{{ warning_icon }} blog/views.py{% endfilename %}
 ```python
 Post.objects.get(pk=pk)
 ```

en/python_introduction/README.md

@@ -1,3 +1,5 @@
+{% set warning_icon = '<span class="glyphicon glyphicon-exclamation-sign" style="color: red;" aria-hidden="true" data-toggle="tooltip" title="An error is expected when you run this command!" ></span>' %}
+
 # Introduction to Python
 
 > Part of this chapter is based on tutorials by Geek Girls Carrots (https://github.com/ggcarrots/django-carrots).
@@ -134,15 +136,17 @@ These are the basics of every programming language you learn. Ready for somethin
 
 Let's try something new. Can we get the length of a number the same way we could find out the length of our name? Type in `len(304023)` and hit `enter`:
 
-{% filename %}command-line{% endfilename %}
+{% filename %}{{ warning_icon }} command-line{% endfilename %}
 ```python
 >>> len(304023)
 Traceback (most recent call last):
   File "<stdin>", line 1, in <module>
 TypeError: object of type 'int' has no len()
 ```
 
-We got our first error! It says that objects of type "int" (integers, whole numbers) have no length. So what can we do now? Maybe we can write our number as a string? Strings have a length, right?
+We got our first error! The {{ warning_icon }} icon is our way of giving you a heads up that the code you are about to run won't work as expected. Making mistakes (even intentional ones) are an important part of learning!
+
+ It says that objects of type "int" (integers, whole numbers) have no length. So what can we do now? Maybe we can write our number as a string? Strings have a length, right?
 
 {% filename %}command-line{% endfilename %}
 ```python
@@ -207,7 +211,7 @@ Awesome, right? Of course, variables can be anything – numbers too! Try this:
 
 But what if we used the wrong name? Can you guess what would happen? Let's try!
 
-{% filename %}command-line{% endfilename %}
+{% filename %}{{ warning_icon }} command-line{% endfilename %}
 ```python
 >>> city = "Tokyo"
 >>> ctiy
@@ -372,7 +376,7 @@ See, it's similar to a list. But you don't need to remember the index – just t
 
 What happens if we ask Python the value of a key that doesn't exist? Can you guess? Let's try it and see!
 
-{% filename %}command-line{% endfilename %}
+{% filename %}{{ warning_icon }} command-line{% endfilename %}
 ```python
 >>> participant['age']
 Traceback (most recent call last):
@@ -498,7 +502,7 @@ You can give Python as many numbers to compare as you want, and it will give you
 
 Have you heard of the expression "comparing apples to oranges"? Let's try the Python equivalent:
 
-{% filename %}command-line{% endfilename %}
+{% filename %}{{ warning_icon }} command-line{% endfilename %}
 ```python
 >>> 1 > 'django'
 Traceback (most recent call last):
@@ -663,7 +667,7 @@ if 3 > 2:
 
 If we were to save and run this, we'd see an error like this:
 
-{% filename %}command-line{% endfilename %}
+{% filename %}{{ warning_icon }} command-line{% endfilename %}
 ```
 $ python3 python_intro.py
 File "python_intro.py", line 2
@@ -849,7 +853,7 @@ hi()
 
 Remember: The `print` function is indented four spaces within the `if` statement. This is because the function runs when the condition is met. Let's see how it works now:
 
-{% filename %}command-line{% endfilename %}
+{% filename %}{{ warning_icon }} command-line{% endfilename %}
 ```
 $ python3 python_intro.py
 Traceback (most recent call last):