id stringlengths 16 145 | text stringlengths 1 179k | title stringclasses 1
value |
|---|---|---|
python_descriptors_attribute/supportingindexandke_32_0.txt | class ForgivingIndexer: | |
python_descriptors_attribute/Peter_Lamut_blog_25_2.txt | s.com/start/)
* [ Log in ](https://wordpress.com/log-in?redirect_to=https%3A%2F%2Fr-login.wordpress.com%2Fremote-login.php%3Faction%3Dlink%26back%3Dhttps%253A%252F%252Fblog.peterlamut.com%252F2019%252F06%252F24%252Fdropping-into-a-debugger-with-the-built-in-debugger-function%252F)
* [ Report this content ](http... | |
python_descriptors_attribute/supportingindexandke_33_0.txt | def __init__(self, sequence):
self.sequence = sequence | |
python_descriptors_attribute/howtousepythondictio_108_0.txt | Related: | |
python_descriptors_attribute/howtousepythondictio_1_0.txt | [ infoworld ](/) | |
python_descriptors_attribute/howtousepythondictio_6_0.txt | [ ]() | |
python_descriptors_attribute/lookups_33_0.txt | * __ Project description
* __ Project details
* __ Release history
* __ Download files | |
python_descriptors_attribute/lookups_126_0.txt |  | |
python_descriptors_attribute/lookups_9_0.txt | pip install lookups __ Copy PIP instructions | |
python_descriptors_attribute/462180_27_0.txt | Linear search (testing each one) isn’t that. You don’t need dict to do that
for you, if dict did this then it would be behaving like a list or, in other
words, use a list. But since it does provide the values, you can do linear
search on that. | |
python_descriptors_attribute/Peter_Lamut_blog_14_5.txt | Foo'>
<__main__.DescriptorX at 0x7fa0b2ff3790>
Even though the result is actually the descriptor itself, the extra line
printed to output tells us that its ` __get__() ` method was indeed invoked,
returning the descriptor.
> The ` __get__() ` method receives two arguments – the instance on which an
> attribu... | |
python_descriptors_attribute/Peter_Lamut_blog_17_4.txt | 2018 ](https://blog.peterlamut.com/2018/02/)
* [ December 2017 ](https://blog.peterlamut.com/2017/12/)
* [ November 2017 ](https://blog.peterlamut.com/2017/11/)
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python_descriptors_attribute/howtousepythondictio_102_0.txt | ## Dictionaries vs. sets | |
python_descriptors_attribute/howtousepythondictio_51_0.txt |
If you have a container as a value, and you want to retrieve a _nested value_
—that is, something from within the container—you can either access it
directly with indexing (if supported), or by using an interstitial assignment: | |
python_descriptors_attribute/Peter_Lamut_blog_15_1.txt | False # !!!
In order to work as expected, an enum member’s _value_ must be compared:
>>> State.NEW.value == state
True
This is unfortunate, because the extra ` .value ` part makes the expression
more verbose, and people might (rightfully) start complaining about
readability. Not to me... | |
python_descriptors_attribute/supportingindexandke_38_0.txt | >>> colors["2"]
'green' | |
python_descriptors_attribute/supportingindexandke_24_0.txt | >>> fruit_counts = {"lime": 1, "apple": 4, "pear": 2}
>>> fruit_counts["pear"]
2 | |
python_descriptors_attribute/462180_66_0.txt | 1 Like | |
python_descriptors_attribute/lookups_23_0.txt | ###### GitHub Statistics | |
python_descriptors_attribute/howtousepythondictio_84_0.txt | for movie in movie_years:
print (movie_years[movie]) | |
python_descriptors_attribute/462180_16_0.txt | You misunderstand what a dictionary is.
It’s a key-value store, if you have a key you can get the value. There is no
searching involved, it is direct lookup. | |
python_descriptors_attribute/supportingindexandke_49_0.txt | #### Series: Dunder Methods | |
python_descriptors_attribute/lookups_55_0.txt | # lookup_all(cls): get all matching instances
# all_parent_matches is an immutable sequence
# of parent, child1 and child2
all_parent_matches = my_lookup.lookup_all(ParentClass)
# all_children_matches is an immutable sequence
# of child1 and child2
all_children_matches = my_lookup.lookup_all(ChildClass) | |
python_descriptors_attribute/howtousepythondictio_72_0.txt | Function objects can be stored in a dictionary as values. This lets us use
dictionaries to execute one of a choice of functions based on some key—a
common way to emulate the ` switch/case ` functionality found in other
languages. | |
python_descriptors_attribute/howtousepythondictio_13_0.txt | * [ Home ](/)
* [ Software Development ](/category/application-development/)
* [ Python ](/category/python/) | |
python_descriptors_attribute/howtousepythondictio_109_0.txt | * [ Python ](/category/python/)
* [ Programming Languages ](/category/programming-languages/)
* [ Software Development ](/category/application-development/) | |
python_descriptors_attribute/Peter_Lamut_blog_13_0.txt | Skip to content
[ ](https://blog.peterlamut.com/)
[ Peter Lamut's blog ](https://blog.peterlamut.com/)
Mostly writings about Python and programming in general
Menu
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python_descriptors_attribute/howtousepythondictio_10_0.txt | * Follow Us
* [ __ ](https://www.linkedin.com/company/164364)
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python_descriptors_attribute/Peter_Lamut_blog_10_1.txt | of **twelve** uninterrupted
and highly focused effective hours, producing a bug-free, efficient, and easy
to use program component in that session – that was the feedback I received
from reviewers.
And just how does that compare to modern open space offices with beanbags and
ping pong tables many companies see as a mu... | |
python_descriptors_attribute/462180_9_0.txt | Because if so, I see it works only if **X** is a key, not a value (regardless
if that is a string or an integer): | |
python_descriptors_attribute/462180_8_0.txt | I just have a question about this. When saying **` if X in directions ` ** is
it similar (or can be called an iteration through the dictionary)? | |
python_descriptors_attribute/Peter_Lamut_blog_12_4.txt | uary 2018 ](https://blog.peterlamut.com/2018/02/)
* [ December 2017 ](https://blog.peterlamut.com/2017/12/)
* [ November 2017 ](https://blog.peterlamut.com/2017/11/)
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* [ Privacy Policy ](/privacy) | |
python_descriptors_attribute/lookups_56_0.txt | # lookup_result(cls): get a Result object for the searched class
parent_result = my_lookup.lookup_result(ParentClass)
# all_instances(): all instances corresponding to the searched
# class (ie. similar to plain lookup_all())
parent_result.all_instances()
# all_classes(): Immutable set of all types in the result.
# ... | |
python_descriptors_attribute/Peter_Lamut_blog_12_0.txt | Skip to content
[ ](https://blog.peterlamut.com/)
[ Peter Lamut's blog ](https://blog.peterlamut.com/)
Mostly writings about Python and programming in general
Menu
* [ Home ](/)
* [ Twitter ](https://twitter.com/plamut "Twitter: @plamut")
* [ GitHub ](https://github.com/plamut "GitHub: plamut")
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python_descriptors_attribute/lookups_141_0.txt | * English
* español
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* esperanto | |
python_descriptors_attribute/howtousepythondictio_76_0.txt | command = "run"
# execute run_func
my_dict[command](x, y)
# or ...
cmd = my_dict[command]
cmd(x, y) | |
python_descriptors_attribute/supportingindexandke_48_0.txt | Get weekly Python tips | |
python_descriptors_attribute/supportingindexandke_37_0.txt |
But we also pass in a string to these square brackets, and our `
ForgivingIndexer ` object will convert that string into an integer: | |
python_descriptors_attribute/howtousepythondictio_31_0.txt | ### Keys in dictionaries | |
python_descriptors_attribute/lookups_39_0.txt | ## Principle | |
python_descriptors_attribute/lookups_137_0.txt | Developed and maintained by the Python community, for the Python community.
[ Donate today! ](https://donate.pypi.org) | |
python_descriptors_attribute/lookups_66_0.txt | * Axel Voitier [ axel.voitier@gmail.com ](mailto:axel.voitier@gmail.com) | |
python_descriptors_attribute/lookups_29_0.txt | __ Tags lookup, lookups, dci | |
python_descriptors_attribute/462180_38_0.txt | [ digital2728968217 ](https://discuss.codecademy.com/u/digital2728968217)
October 30, 2020, 11:13am 7 | |
python_descriptors_attribute/supportingindexandke_26_0.txt | >>> colors.__getitem__(1)
'blue' | |
python_descriptors_attribute/supportingindexandke_18_0.txt | Don't have an account yet? [ Sign up here
](/accounts/signup/?next=&action=change_setting) . | |
python_descriptors_attribute/lookups_94_0.txt | ###### Classifiers | |
python_descriptors_attribute/Peter_Lamut_blog_0_2.txt | ay work, putting a strong emphasis on writing clean and
maintainable code.
I use Linux, like to crack jokes, and enjoy attending developer meetups and
conferences like EuroPython.
I do not own any pets or hair care products.
Search for: Search
## Tags
* [ Attribute lookup ](https://blog.peterlamut.com/tag/attr... | |
python_descriptors_attribute/Peter_Lamut_blog_14_17.txt | the [ blog series
](https://github.com/GrahamDumpleton/wrapt/tree/master/blog) by Graham
Dumpleton, as it addresses many more aspects than just working well with
classmethods. Or just use his [ wrapt ](https://pypi.python.org/pypi/wrapt)
library for writing decorators:
import wrapt
@wrapt.decora... | |
python_descriptors_attribute/supportingindexandke_30_0.txt | ## Making square brackets work on your objects | |
python_descriptors_attribute/462180_40_0.txt | for i in directions:
if 'mac' == directions[i]:
print("Data was found")
break
else:
print("Data was not found")
break | |
python_descriptors_attribute/lookups_67_0.txt | Please, add yourself when you contribute! | |
python_descriptors_attribute/supportingindexandke_10_0.txt |  | |
python_descriptors_attribute/howtousepythondictio_57_0.txt | If you try to retrieve a value using a key that doesn't exist in a given
dictionary, you'll raise a ` KeyError ` exception. A common way to handle this
sort of retrieval is to use a ` try/except ` block. A more elegant way to look
for a key that might not be there is the ` .get() ` method. | |
python_descriptors_attribute/supportingindexandke_11_0.txt | Watch as video __ | |
python_descriptors_attribute/howtousepythondictio_122_0.txt |  | |
python_descriptors_attribute/Peter_Lamut_blog_21_0.txt | Skip to content
[ ](https://blog.peterlamut.com/)
[ Peter Lamut's blog ](https://blog.peterlamut.com/)
Mostly writings about Python and programming in general
Menu
* [ Home ](/)
* [ Twitter ](https://twitter.com/plamut "Twitter: @plamut")
* [ GitHub ](https://github.com/plamut "GitHub: plamut")
* [ Stac... | |
python_descriptors_attribute/462180_77_0.txt | 
sebastienbaillargeon: | |
python_descriptors_attribute/howtousepythondictio_88_0.txt |
Finally, we can obtain both keys and values together by way of the ` .items()
` method: | |
python_descriptors_attribute/lookups_106_0.txt |  | |
Django_meta/tutorialdjango_277_0.txt |
11. In ` static/hello/site.css ` , add a rule to format the table a little: | |
Django_meta/tutorialdjango_187_0.txt | ### Create a base page template and styles | |
Django_meta/django_meta_11_0.txt | ### ` managed ` ¶
` Options. ` ` managed ` ¶
Defaults to ` True ` , meaning Django will create the appropriate database
tables in [ ` migrate ` ](../../django-admin/#django-admin-migrate) or as
part of migrations and remove them as part of a [ ` flush ` ](../../django-
admin/#django-admin-flush) manageme... | |
Django_meta/tutorialdjango_47_0.txt | In Django terminology, a "Django project" is composed of several site-level
configuration files, along with one or more "apps" that you deploy to a web
host to create a full web application. A Django project can contain multiple
apps, each of which typically has an independent function in the project, and
the same app ... | |
Django_meta/django_meta_25_0.txt | ### ` verbose_name_plural ` ¶
` Options. ` ` verbose_name_plural ` ¶
The plural name for the object:
verbose_name_plural = "stories"
If this isn’t given, Django will use ` verbose_name ` \+ ` "s" ` .
## Read-only ` Meta ` attributes ¶
| |
Django_meta/tutorialdjango_116_0.txt | Observe that the status bar changes color to indicate debugging: | |
Django_meta/classbasedviews_56_0.txt |  | |
Django_meta/tutorialdjango_72_0.txt | def home(request):
return HttpResponse("Hello, Django!") | |
Django_meta/tutorialdjango_65_0.txt | 5. When you're done, close the browser window and stop the server in VS Code using Ctrl+C as indicated in the terminal output window. | |
Django_meta/classbasedviews_79_0.txt | * [ Join a Group ](https://www.djangoproject.com/community/)
* [ Contribute to Django ](https://docs.djangoproject.com/en/dev/internals/contributing/)
* [ Submit a Bug ](https://docs.djangoproject.com/en/dev/internals/contributing/bugs-and-features/)
* [ Report a Security Issue ](https://docs.djangoproject.com/en/dev/i... | |
Django_meta/classbasedviews_18_0.txt | A view is a callable which takes a request and returns a response. This can be
more than just a function, and Django provides an example of some classes
which can be used as views. These allow you to structure your views and reuse
code by harnessing inheritance and mixins. There are also some generic views
for tasks wh... | |
Django_meta/modelspy_8_0.txt | def get_absolute_url(self):
"""Returns the url to access a particular language instance."""
return reverse('language-detail', args=[str(self.id)]) | |
Django_meta/tutorialdjango_323_0.txt |  | |
Django_meta/tutorialdjango_241_0.txt | Each field takes some attributes, like ` max_length ` . The ` blank=True `
attribute means the field is optional; ` null=true ` means that a value is
optional. There is also a ` choices ` attribute that limits values to values
in an array of data value/display value tuples. | |
Django_meta/django_models_4_4.txt | "django.db.models.ManyToManyField") instances should go in the object that’s
going to be edited on a form. In the above example, ` toppings ` is in `
Pizza ` (rather than ` Topping ` having a ` pizzas ` [ ` ManyToManyField `
](../../../ref/models/fields/#django.db.models.ManyToManyField
"django.db.models.ManyToMan... | |
Django_meta/introduction_3_0.txt | A Python and Django tutorial for beginners. | |
Django_meta/tutorialdjango_78_0.txt | urlpatterns = [
path("", include("hello.urls")),
path('admin/', admin.site.urls)
] | |
Django_meta/tutorialdjango_4_0.txt | [ Version 1.89 ](/updates) is now available! Read about the new features and
fixes from April. | |
Django_meta/django_models_8_0.txt | ## Model inheritance ¶
Model inheritance in Django works almost identically to the way normal class
inheritance works in Python, but the basics at the beginning of the page
should still be followed. That means the base class should subclass [ `
django.db.models.Model `
](../../../ref/models/instances/#django.db.mod... | |
Django_meta/tutorialdjango_239_0.txt | ### Define models | |
Django_meta/modelspy_2_0.txt | from django.urls import reverse # To generate URLS by reversing URL patterns
from django.db.models import UniqueConstraint
from django.db.models.functions import Lower | |
Django_meta/tutorialdjango_73_0.txt |
3. Create a file, ` hello/urls.py ` , with the contents below. The ` urls.py ` file is where you specify patterns to route different URLs to their appropriate views. The code below contains one route to map root URL of the app ( ` "" ` ) to the ` views.home ` function that you just added to ` hello/views.py ` : | |
Django_meta/tutorialdjango_301_0.txt | 3. Use the Step Over ( F10 ) command to step through the template code. Observe that the debugger steps over all declarative statements and pauses at any procedural code. For example, stepping through the ` {% for message in message_list %} ` loops lets you examine each value in ` message ` and lets you step to lines... | |
Django_meta/tutorialdjango_153_0.txt | def hello_there(request, name):
print(request.build_absolute_uri()) #optional
return render(
request,
'hello/hello_there.html',
{
'name': name,
'date': datetime.now()
}
) | |
Django_meta/tutorialdjango_251_0.txt | If you see errors when running the commands, make sure you're not using a
debugging terminal that's left over from previous steps, as they may not have
the virtual environment activated. | |
Django_meta/tutorialdjango_162_0.txt | 1. In the project's ` web_project/urls.py ` , add the following ` import ` statement: | |
Django_meta/tutorialdjango_137_0.txt | * **Go to Definition** jumps from your code into the code that defines an object. For example, in ` views.py ` , right-click on ` HttpResponse ` in the ` home ` function and select **Go to Definition** (or use F12 ), which navigates to the class definition in the Django library. | |
Django_meta/tutorialdjango_112_0.txt | The breakpoint appears as a red dot in the left margin: | |
Django_meta/modelspy_21_0.txt | LOAN_STATUS = (
('d', 'Maintenance'),
('o', 'On loan'),
('a', 'Available'),
('r', 'Reserved'),
) | |
Django_meta/tutorialdjango_100_0.txt |
The first argument to ` path ` defines a route "hello/" that accepts a
variable string called _name_ . The string is passed to the `
views.hello_there ` function specified in the second argument to ` path ` . | |
Django_meta/tutorialdjango_106_0.txt | # Filter the name argument to letters only using regular expressions. URL arguments
# can contain arbitrary text, so we restrict to safe characters only.
match_object = re.match("[a-zA-Z]+", name) | |
Django_meta/tutorialdjango_325_0.txt |  | |
Django_meta/tutorialdjango_287_0.txt |
15. Also in ` urls.py ` , make a variable for the new view, which retrieves the five most recent ` LogMessage ` objects in descending order (meaning that it queries the database), and then provides a name for the data in the template context ( ` message_list ` ), and identifies the template to use: | |
Django_meta/tutorialdjango_222_0.txt |
6. In ` views.py ` , add functions for the /about and /contact routes that refer to their respective page templates. Also modify the ` home ` function to use the ` home.html ` template. | |
Django_meta/tutorialdjango_285_0.txt |
14. In the app's ` urls.py ` , import the data model: | |
Django_meta/tutorialdjango_221_0.txt | path("about/", views.about, name="about"),
path("contact/", views.contact, name="contact"), | |
Django_meta/django_meta_23_0.txt | ### ` constraints ` ¶
` Options. ` ` constraints ` ¶
A list of [ constraints ](../constraints/) that you want to define on the
model:
from django.db import models
class Customer(models.Model):
age = models.IntegerField()
class Meta:
constraints = [
... | |
Django_meta/tutorialdjango_269_0.txt | <!-- Insert below the link to Home -->
<a href="{% url 'log' %}" class="navbar-item">Log Message</a> | |
Django_meta/tutorialdjango_226_0.txt |
### Run the app |
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