https://github.com/ehmatthes/pcc/blob/master/chapter_11/test_name_function.py

unittest.main() does not work (at least in Python 3.7), results in:
Ran 0 tests in 0.000s

It's required to have:

if __name__ == '__main__':
    unittest.main()

I'm not sure if this is a recent change / change to Django since the book was published, but while following the exercises in Chapter 18 on Django2.0, I got the TypeError: __init__() missing 1 required positional argument: error when I was working on Chapter 18's portion of adding the Entry class to the models.py file. I even tried copy-pasting exactly the code you have in Github in case I just had a typo or so, but I still got the error.

The error occurred when creating the topic attribute in the Entry class definition because the instance created with models.ForeignKey() only had 1 argument (Topic) and did not have an argument for on_delete.

• Portion of Code erroring out: https://github.com/ehmatthes/pcc/blob/master/chapter_18/learning_logs/models.py#L14
• Django documentation regarding ForeignKey arguments: https://docs.djangoproject.com/en/2.0/ref/models/fields/#django.db.models.ForeignKey
• Django documentation regarding on_delete: https://docs.djangoproject.com/en/2.0/ref/models/fields/#django.db.models.ForeignKey.on_delete

When I included an argument for on_delete, the error resolved. However, I wasn't 100% sure yet which value I should use for the on_delete argument because I am still so early on in the Learning Log project. I settled for on_delete=models.PROTECT for now because based on the project, I felt as if we wouldn't want all the entries to get deleted simply because a Topic got deleted and also because on_delete=models.SET_NULL ended up with its own errors. I'll research that more.

On Chapter 20, when I edit base.html I get an error at . It says "Unexpected tokens".

Do you know how to fix this?

Code review: Exceptions (IOError vs FileNotFoundError) under Python 2.7.12

Able to run alice.py via:
filename = 'alice.txt' try: with open(filename) as f_obj: contents = f_obj.read() except IOError: msg = "Sorry, the file " + filename + " does not exist." print(msg)

System: MAC OS 10.11.6, Anaconda Python REPL

code encounters error on line 46
AttributeError: 'NoneType' object has not attribute 'decode'

I think this error may be due to non-standard ASCII characters in the repo_dict descriptions.

When working in Chapter 17 setting up custom tooltips (pp 388-389) I ran into the issue where the description for the project 'shadowsocks' was None. When the project is run you get a 'AttributeError: 'NoneType' object has no attribute 'decode'' exception when you try to render.

To get around this I had to add a None checker before I populate the plot_dict data, something like this:

for repo_dict in repo_dicts:

    # Cleans any none values and replaces with empty string
    for k, v in repo_dict.items():
        if v is None:
            repo_dict[k] = ''

    names.append(repo_dict['name'])
    plot_dict = {
        'value': repo_dict['stargazers_count'],
        'label': repo_dict['description']
    }

    plot_dicts.append(plot_dict)

Not sure this is the fastest way of doing it but it worked for me.

Hi Eric,

So I've set up the learning log web app twice through. Everything is functional on localhost and I'm not getting any errors during the heroku setup. Heroku is telling me that my build was successful, but when I try to open the app, I get an error screen saying...

"Application error
An error occurred in the application and your page could not be served. If you are the application owner, check your logs for details."

I don't see any obvious problems in the build log, so I'm not sure how/where to start the troubleshooting process. I'm confident that all of my files are correctly set up and in the correct locations. When I got this error the first time through, I deleted everything and started over, paying close attention to all of your update notes to make sure everything was current. As mentioned, the app works locally and builds successfully on heroku, but it can't be served. What could cause this?

I'm checking with our IT group to verify that our firewall is not somehow blocking the process. The fact that I'm able to do everything heroku-related except open the app makes me think this isn't the problem, but I'm checking anyway.

If you want me to send the build log, please let me know.

Thanks!

Hello I am learning 19 chapters, the emergence of the error 'TemplateDoesNotExist', I see a lot of some of the instructions, or did not solve the problem, you can help me see where is not set up, thank you so much, the following is the log

``

Request Method: GET
Request URL: http://127.0.0.1:8000/new_topic/

Django Version: 1.11.3
Python Version: 3.6.1
Installed Applications:
['django.contrib.admin',
'django.contrib.auth',
'django.contrib.contenttypes',
'django.contrib.sessions',
'django.contrib.messages',
'django.contrib.staticfiles',
'learning_logs']
Installed Middleware:
['django.middleware.security.SecurityMiddleware',
'django.contrib.sessions.middleware.SessionMiddleware',
'django.middleware.common.CommonMiddleware',
'django.middleware.csrf.CsrfViewMiddleware',
'django.contrib.auth.middleware.AuthenticationMiddleware',
'django.contrib.messages.middleware.MessageMiddleware',
'django.middleware.clickjacking.XFrameOptionsMiddleware']

Template loader postmortem
Django tried loading these templates, in this order:

Using engine django:
* django.template.loaders.filesystem.Loader: /Users/Wzd/Documents/github/python/mydjango/project_1/learing_log/learning_logs/templates/learning_logs/new_topics.html (Source does not exist)
* django.template.loaders.app_directories.Loader: /usr/local/lib/python3.6/site-packages/django/contrib/admin/templates/learning_logs/new_topics.html (Source does not exist)
* django.template.loaders.app_directories.Loader: /usr/local/lib/python3.6/site-packages/django/contrib/auth/templates/learning_logs/new_topics.html (Source does not exist)
* django.template.loaders.app_directories.Loader: /Users/Wzd/Documents/github/python/mydjango/project_1/learing_log/learning_logs/templates/learning_logs/new_topics.html (Source does not exist)

Traceback:

File "/usr/local/lib/python3.6/site-packages/django/core/handlers/exception.py" in inner
41. response = get_response(request)

File "/usr/local/lib/python3.6/site-packages/django/core/handlers/base.py" in _get_response
187. response = self.process_exception_by_middleware(e, request)

File "/usr/local/lib/python3.6/site-packages/django/core/handlers/base.py" in _get_response
185. response = wrapped_callback(request, *callback_args, **callback_kwargs)

File "/Users/Wzd/Documents/github/python/mydjango/project_1/learing_log/learning_logs/views.py" in new_topic
46. return render(request, 'learning_logs/new_topics.html', context)

File "/usr/local/lib/python3.6/site-packages/django/shortcuts.py" in render
30. content = loader.render_to_string(template_name, context, request, using=using)

File "/usr/local/lib/python3.6/site-packages/django/template/loader.py" in render_to_string
67. template = get_template(template_name, using=using)

File "/usr/local/lib/python3.6/site-packages/django/template/loader.py" in get_template
25. raise TemplateDoesNotExist(template_name, chain=chain)

Exception Type: TemplateDoesNotExist at /new_topic/
Exception Value: learning_logs/new_topics.html`

In order to use pygal.maps.world module in the file, it is necessary for the user to install it on top of the pygal package installation.

It can be installed with pip:

pip install pygal_maps_world

Reference: Pygal - World Map Documentation

Hey Eric, I'm doing the Chapter 19 assignment and I'm quite stuck with the edit_entry() View Function.
It seems, that under Django 2.0 the function causes an error and raises an exception:

Reverse for 'learning_logs/topic' not found. 'learning_logs/topic' is not a valid view function or pattern name.

Hi Eric,

The only way I could get this to work was by taking out the namespace argument, which you say on page 413 is important to know how to implement when projects start to grow. Please help me structure learning_log\urls.py so that I can use namespacing.

This one works (in that the server starts up)

from django.conf.urls import include, url
from django.contrib import admin

urlpatterns = [
url(r'^admin/', admin.site.urls),
url(r'', include('learning_logs.urls')),
]

System check identified no issues (0 silenced).
April 24, 2018 - 12:22:41
Django version 2.0.4, using settings 'learning_log.settings'
Starting development server at http://127.0.0.1:8000/
Quit the server with CTRL-BREAK.

=================================

This fails...

from django.conf.urls import include, url
from django.contrib import admin

urlpatterns = [
url(r'^admin/', admin.site.urls),
url(r'', include('learning_logs.urls', namespace='learning_logs')),
]

File "C:\Users\mburnett\PycharmProjects\untitled\learning_log\learning_log\urls.py", line 7, in module>
url(r'', include('learning_logs.urls', namespace='learning_logs')),
File "C:\Users\mburnett\PycharmProjects\untitled\learning_log\11_env\lib\site-packages\django\urls\conf.py", line 39, in include
'Specifying a namespace in include() without providing an app_name '
django.core.exceptions.ImproperlyConfigured: Specifying a namespace in include() without providing an app_name is not supported. Set the app_name attribute in the included module, or pass a 2-tuple containing the list of patterns and app_name instead.

It's asking for an "app_name," but I don't know where that attribute should be set.

Here is the other urls.py file as it exists in learning_logS

"""Defines url patterns for learning_logs."""

from django.conf.urls import url
from . import views

urlpatterns = [
# Home page.
url(r'^$', views.index, name='index'),

# Show all topics.
url(r'^topics/$', views.topics, name='topics'),

# Detail page for a single topic.
url(r'^topics/(?P<topic_id>\d+)/$', views.topic, name='topic'),

]

Thanks!

Hi Eric,
I am reading your Python Crash Course and am currently at Chapter 17, Working with APIs.

For the python_repos.py example, I wanted to use the following code:
description = repo_dict.get('description', 'No description provided')
Instead of:
description = repo_dict['description']
if not description:
description = 'No description provided.'
But this gives me an error code:
"NoneType" object has not attribute 'decode'.

Why is this?

Thank you!

Best,
Tian

I typed in the code in chapter 12 to add the spaceship. All I see is a blank screen.

Running on macOS

So I tried it in a VM running linux, and I see the space ship.

Running same Code in Linux

I went back to macOS and opened up your chapter12 solution and still no spaceship.Just a blank screen. Then I opened your code in Linux and I see the spaceship.

Like #67 I couldn't install latest pygame using the instructions in the book. So I guessed and used

$ pip3 install pygame

I don't know the difference between that and the suggestion

$ python3 -m pip install --user pygame

I don't see any errors in the console when I run. Just this:

chapter_12$ cd /Users/mgwelch/Documents/references/python-crash-course-resources/chapter_12 ; env "PYTHONIOENCODING=UTF-8" "PYTHONUNBUFFERED=1" /usr/local/opt/python/bin/python3.7 /Users/mgwelch/.vscode/extensions/ms-python.python-2019.2.5558/pythonFiles/ptvsd_launcher.py --default --client --host localhost --port 64094 /Users/mgwelch/Documents/references/python-crash-course-resources/chapter_12/alien_invasion.py 
pygame 1.9.4
Hello from the pygame community. https://www.pygame.org/contribute.html

Apparently something is wrong with my macOS environment.

Hi @ehmatthes, just wanted to thank you for your trust in https://github.com/dyve/django-bootstrap3! Great to see it in your book.

Chapter 12/ bullet.py /
In line 19, i think we should replace self.y = float(self.rect.y) with self.y = float(ship.rect.y) to solve this problem.

Hello, I run your code meet some problems.

The last line of code:
chart.render_to_file('python_repos.svg')

In Windows10, pycharm environment run to get:
'NoneType' object has no attribute 'decode'

So I change something to run that, but I don't know exactly how it works, the code is:
chart.render_to_file('python_repos.svg', decode='utf-8')

Thank you!

Hi,

I get the following error when i try to run language_survey.py:

Traceback (most recent call last):
File "", line 1, in
File "/home/savo/python/pythoncrash/book/chapter_11/language_survey.py", line 8, in
my_survey.show_question()
File "/home/savo/python/pythoncrash/survey.py", line 11, in show_question

NameError: name 'question' is not defined

I checked multiple times for typos, then downloaded the code from github and tried to run it - got the same error. I can't figure out what it is.

P.S. i changed the working directory accordingly with os.chdir(), so it's not that

I noticed that in your guide to testing the status code for python_repos.py, you have "import python_repos_for_testing as pr". When I used that, python gave me an error that there's no such module. So I changed it to "import python_repos as pr", and that seemed to work. The test ran without errors.
Was it OK to make that change, or did I mess up the unittest?

Thanks!

in the ch12,ship.py
the self.rect.centerx only stores the integers,so must change it to float,
so use self.center to instead,
but in the line 35:self.rect.centerx = self.center,
why centerx can store in float in this time?
i don't understand,please tell me,thank you sincerely!

Dear Eric Matthes:
Thank you for this book.I like it very much!
But when i try to add a new topic,just like Chapter 19,but i failed because of 403 forbidden.
It seems something wrong in {% csrf_token %}.
Can you help me to solve this problem?
With pleasure.

hello,I have a question,
in "def update_screen(ai_settings, screen, ship, aliens, bullets):" function ,
I write aliens.draw(screen) this one fuc， but the programing still can't running.
the following is error:

Traceback (most recent call last):
File "alien_invasion.py", line 32, in
run_game()
File "alien_invasion.py", line 31, in run_game
gf.update_screen(ai_settings, screen, ship, alien, bullets)
File "/Users/Wzd/Documents/github/alien_invasion/game_functions.py", line 35, in update_screen
aliens.draw(screen)
AttributeError: 'Alien' object has no attribute 'draw'

can you help me ,thanks ,I 'm reading your book, it's good!

Just want to make a note that the chapter 12 code does not work on os x within a virtualenv.

https://bitbucket.org/pygame/pygame/issues/203/window-does-not-get-focus-on-os-x-with

Dear Matthes:

Thanks for your book "Python Crash Course"!

I have learned a lot from it through coding. And I find out an error occur in test_survey.py in Chapter 11.

First I coded it by myself, but the Ipython console display "Failed". Then I search the Internet to find the answer.

When I find your code in Github, and run the code. The Ipython console also displays the same error as follows:

The paradox is that when I run the language_survey.py, the Ipython console display the right result.

Hi Eric,

I am using MacOS 10.14 and I have a problem with installing Pygame.

After running those codes in Terminal:

brew install hg sdl sdl_image sdl_ttf
brew install sdl_mixer portmidi
pip3 install --user hg+http://bitbucket.org/pygame/pygame

Everything is going well except the last code (pip3 installer).

See the screenshot below:

Do you know what could be the problem here?

Thank you in advance!

print(4 + 4)
print(12 - 4)
print(4 * 2)
print(16 / 2)

In chapter 12 when you are supposed to install pygame (did this on both ubuntu 17.10 and 18.04) and you come to pip3 install --user hg+http://bitbucket.org/pygame/pygame

It complains that freetype is missing. So I had to also install libfreetype6-dev also. Then it works.

whenever I perform the exercise foods.py page 67 it prints the commands separately instead of in a group, i.e. it prints "my favorite foods are:" right after I type the print command instead of in a block of text with the foods like stated in the book.
Doc1.docx
how do i fix that?

ref p.378:
Upon entering the following address in my browser's address bar (Google Chrome):
https://api.github.com/search/respositories?q=language:python&sort=stars

I'm getting the following message:
{
"message": "Not Found",
"documentation_url": "https://developer.github.com/v3"
}

Please accept my advance apologies if this is some error on my part.

In the login.html file:

Indentations are missing on lines: 6, 10, 11, 13, 14

The code worked after these indentations were applied.

What's API provided in chapter 17.3 were sick.
https://hacker-news.firebaseio.com/v0/item/9884165.json
https://hacker-news.firebaseio.com/v0/topstories.json

COUNTRIES dictionary is in module i18n.py.
correct code to use is:
"from pygal_maps_world.i18n import COUNTRIES"

Hi @ehmatthes!
Thank very much for really awesome book!

I think I found an error.

Chapter 10: "Files and Exceptions" we have a task 10-6:

10-6. Addition: One common problem when prompting for numerical input
occurs when people provide text instead of numbers. When you try to convert
the input to an int, you’ll get a TypeError. Write a program that prompts for
two numbers. Add them together and print the result. Catch the TypeError if
either input value is not a number, and print a friendly error message. Test your
program by entering two numbers and then by entering some text instead of a
number.

But if "user" enter a text and the program try convert it we get a ValueError.

This error appears on many of the files, I've been going around this problem by not calling the keys and values of the dictionary that are not correctly formatted

I am at ship.py and wrote the instruction self.image = pygame.image.load('images/ship.bmp'). I do not get any error but when I run the script, I just get a black square at the bottom of the screen instead of the ship.bmp. Any ideas? Am I missing any packages to be installed?

When I tested alien game in chapter 12, I found "K_SPACE" is not working with my keyboard, so I change it to "K_UP", and it works fine. And after I check, I think the reason is "K_SPACE" is duplicated with some keyboard. So please modify it to clarify this phenomenon.thanks.

In chapter 10 word_count.py has a repeated function definition.

Hey Eric, I'm following the instructions in chapter 12 and I can't seem to get my ship to move at all. Do I need to do anything to "capture" the keyboard input while checking the code running in the game screen? I can see the key codes being printed out in the console, but the screen does not update. I even tried using the code you've provided for the restore point with no luck.
I did pre-install the audio components you mention that are optional at the beginning of the project. Is there something I need to do to have this script work with those components installed?
My code thus far: https://github.com/dbonomo/fun-with-pygame

Hello,

I would like to use these cheat sheets for my Python class, but this GitHub repository is missing license. I'm not sure whether I can use these files or not.

May I ask you to add some LICENSE file to the repository?

Thank you very much for your work.

The descriptions for httpie, ansible and certbot are relatively long and make the hyperlink to the project inaccessible given its default position in the bottom right of the text box. How can we tell pygal to wrap the description in a constant-width text box so the hyperlink is always in view?

Do we have any control over where the "Link >" string appears in the text box?

Thanks!

Hi, Eric:

I am using MacOS, and run those instructions already

brew install hg sdl sdl_image sdl_ttf
brew install sdl_mixer portmidi
pip3 install --user  hg+http://bitbucket.org/pygame/pygame

after this, when I switch to python3 console, import pygame, no module named 'pygame'

below is the screenshoot:

Hello

Currently installing pygame encounters a problem:
Pip3 has been successfully installed, but pygame can not be installed
Google some of the solutions, but did not solve this problem.
The use of python3 failed to install; python2.7 was installed successfully.

ting@ting-All-Series:~$ sudo pip3 install --user hg+http://bitbucket.org/pygame/pygame
The directory '/home/ting/.cache/pip/http' or its parent directory is not owned by the current user and the cache has been disabled. Please check the permissions and owner of that directory. If executing pip with sudo, you may want sudo's -H flag.
The directory '/home/ting/.cache/pip' or its parent directory is not owned by the current user and caching wheels has been disabled. check the permissions and owner of that directory. If executing pip with sudo, you may want sudo's -H flag.
Collecting hg+http://bitbucket.org/pygame/pygame
Cloning hg http://bitbucket.org/pygame/pygame to /tmp/pip-i07ajklr-build
Complete output from command python setup.py egg_info:

WARNING, No "Setup" File Exists, Running "config.py"
Using UNIX configuration...

/bin/sh: 1: freetype-config: not found
/bin/sh: 1: freetype-config: not found
/bin/sh: 1: freetype-config: not found

Hunting dependencies...
WARNING: "freetype-config" failed!
SDL     : found 1.2.15
FONT    : found
IMAGE   : found
MIXER   : found
PNG     : found
JPEG    : found
SCRAP   : found
PORTMIDI: found
PORTTIME: found
FREETYPE: not found
Missing dependencies

----------------------------------------

Command "python setup.py egg_info" failed with error code 1 in /tmp/pip-i07ajklr-build/

=========================
ting@ting-All-Series:~$ pip3 --version
pip 9.0.1 from /usr/local/lib/python3.4/dist-packages (python 3.4)

As described here and here, and elsewhere the url in ./learning_log/learning_log/urls.py no longer accepted the include argument 3-tuple. Instead the syntax regex argument and app name should be passed.

Hi, how did you made the cheatsheets?
I'd like to make print them with a white background (for a bw printer)

I am having an issue with chapters 15 and 16. When I open a map or bar graph in MS Edge and hover over a par or country, the outline darkens but I do not get any of the info that should be showing (ie. Country code and population).

Below is an example of the code I have for world_population.py.

import json
from pygal.maps.world import World
from pygal.style import RotateStyle
from country_codes import get_country_code

Load the data into a list.

filename = 'population_data.json'
with open(filename) as f:
pop_data = json.load(f)

Build a dictionary of population data.

cc_populations = {}
for pop_dict in pop_data:
if pop_dict['Year'] == '2010':
country_name = pop_dict['Country Name']
population = int(float(pop_dict['Value']))
code = get_country_code(country_name)
if code:
cc_populations[code] = population

Group the countries into 3 population levels.

cc_pops_1, cc_pops_2, cc_pops_3, = {}, {}, {}
for cc, pop in cc_populations.items():
if pop < 10000000:
cc_pops_1[cc] = pop
elif pop < 1000000000:
cc_pops_2[cc] = pop
else:
cc_pops_3[cc] = pop

See how many countries are in each level.

print(len(cc_pops_1), len(cc_pops_2), len(cc_pops_3))

wm = World()
wm.force_uri_protocol = 'http'
wm.title = 'World Population in 2010, by Country'
wm.add('0-10m', cc_pops_1)
wm.add('10m-1bn', cc_pops_2)
wm.add('>1bn', cc_pops_3)

wm.render_to_file('World Population.svg')