Errata

The table states that MAIL_HOSTNAME is the key to use for setting the mail server. However, the correct key is MAIL_SERVER, as in the example code.

Note from the Author or Editor:
I have updated the manuscript with this correction for future editions.

In the text below, you would have to import app from hello.py for the code to work.


Sending Emails from the Python Shell

To test the configuration you can start a shell session and send a test email:
> > > from flask.ext.mail import Message
> > > from hello import mail
> > > msg = Message('test subject', sender ='you@example.com', ...
recipients =['you@example.com'])
> > > msg.body = 'text body'
> > > msg.html = '< b > HTML </ b > body'
> > > with app.app_context():
... mail.send( msg)

Note from the Author or Editor:
This report applies to the early release of the book. I have already made a correction in the manuscript.

Example 7-4. app/main/_)init___.py: Blueprint creation.

file name above should be __init__.py

Note from the Author or Editor:
This report applies to the early release of the book. I have already made a correction in the manuscript.

There is an extra {% endblock %} in the example 8-12 template for login. This extra endblock is not in the git repo for the book but is shown in the book text.

{% extends "base.html" %}
{% import "bootstrap/ wtf.html" as wtf %}

{% block title %} Flasky - Login{% endblock %}

{% block page_content %}
<div class="page-header">
<h1>Login</h1>
</div>
{% endblock %}

<div class="col-md-4">
{{ wtf.quick_form( form) }}
</div>
{% endblock %}

Note from the Author or Editor:
This report applies to the early release of the book. I have already made a correction in the manuscript.

The line should say $ git reset --hard (please note the double dashes)

Actually I just changed my font in Google Play to Sans and see it is displayed correctly. You may want to suggest users display the book in Sans Serif.

Great book so far

Note from the Author or Editor:
This is has been changed to code font, so it looks much better now. Note that this report applies to the early release of the book.

In Example 3.3: It is

@app.route('/index')
def index():
...

It should be:

@app.route('/')
def index():
...

In the same example from github it's correct.

Note from the Author or Editor:
I have corrected the manuscript for future editions.

"Conditionals in Jinja2 have the format {% if variable %}...{% else %}...{% endif %}."

The "if variable" in Jinja2 template representation should be reformulated to "if condition". The rest of the text is alright and tells exactly what it is. The condition may be a variable but it is not necessarily one.

Thank you for the book.

Note from the Author or Editor:
I have fixed this mistake in Atlas for future editions.

The line that reads form.name.data = '' does not have any effect, it was left there by mistake.

Using the code in the book and on git:

>>> app
<Flask 'app'>

Should show instead:
>>> app
<Flask 'hello'>

And:

>>> User
<class 'app.User'>

Should show:
>>> User
<class '__main__.User'>

Note from the Author or Editor:
This report applies to the early release of the book. I have already made a correction in the manuscript.

The instructions state to type python manage.py shell when the call should be to hello.py

Note from the Author or Editor:
This report applies to the early release of the book. I have already made a correction in the manuscript.

The line that imports the blueprint is missing a dot. The correct statement is: from .main import main as main_blueprint (note the dot before "main").

The Python formatting in this source code is inconsistent about the format for assigning values to named parameters. When assigning values to named parameters in a function call there should be no spaces around the assignment operator ('='). This is used correctly at some points ("User.query.filter_by(username=form.name.data).first()) but not in others ("User(username = form.name.data)").

In particular, note the call to render_template().

Minor issue, just looking for consistency.

Note from the Author or Editor:
Made a correction in Atlas.

breakout box currently reads:

If you have cloned the application?s git repository on GitHub you can run git checkout 8c to checkout this version of the application. This update contains a database migration, remember to run python manage.py db upgrade after you checkout the code. To ensure that you have all the dependencies installed also run pip -r requirements.txt.

Breakout box should read:

If you have cloned the application?s git repository on GitHub you can run git checkout 8c to checkout this version of the application. This update contains a database migration, remember to run python manage.py db upgrade after you checkout the code. To ensure that you have all the dependencies installed also run pip install -r requirements.txt.

Note from the Author or Editor:
This report applies to the early release of the book. I have already made a correction in the manuscript.

In Example 8-10 it is written "Sign Out" and "Sign In". In the corresponding Figure 8-1 the word "Log In" is displayed. Either the Example or the Figure should be changed.

In file "app/templates/base.html" in "flasky" git repository the words "Log Out" and "Log In" are implemented. IMHO, the Example 8-10 should be corrected.

Note from the Author or Editor:
I'm updating the manuscript in Atlas for future editions.

This form uses the Regexp validator from WTForms to ensure that the username field contains letters, numbers, underscores, and dots only. -> This form uses the Regexp validator from WTForms to ensure that the username field starts with a letter and contains letters, numbers, underscores, and dots only.

because the browser converts them to absolute by adding -> because the browser converts them to absolute URLs by adding

Note from the Author or Editor:
2nd edition manuscript updated with this suggestion

The imports should include "Length" from wtforms.validators.

Note from the Author or Editor:
Made a correction in Atlas.

div elements after the thumbnail div should be wrapped in

<div class="post-content">
...
</div>

to properly space author link and body from thumbnail.

This is reflected in the github code, but not in print.

Thanks!

Note from the Author or Editor:
Incorporated towards 2nd edition of the book.

The test_posts function has two minor errors.

First, it uses "self.get_auth_header" for it's header under '# write a post' when it should be "self.get_api_headers" as it is in GitHub.

Second, in that same section, the value of the data diction is written as 'body of the blog post' when in the assertion check below, the body json_response is defined as 'body of the *blog* post' and the body_html response is defined as '<p>body of the <em>blog</em> post</p>'.

The original definition of the body value in the data dictionary should be "body of the *blog* post" to reflect the assertions.

Note from the Author or Editor:
Book source files updated.

Selenium version in requirements.txt

Hello

The version of Selenium included in the requirements.txt file fails to execute the tests. Further inspection showed that it fails to a an error: "Failed to load profile".

This is fixed in later versions of Selenium so upgrading Selenium (pip install -U selenium) resolved the problem.

Thanks for a great book.

Jaco

Note from the Author or Editor:
I will review this problem and update the requirements.