id stringlengths 16 145 | text stringlengths 1 179k | title stringclasses 1
value |
|---|---|---|
python_descriptors_attribute/lookups_44_0.txt | ## ` lookups.GenericLookup ` | |
python_descriptors_attribute/supportingindexandke_57_0.txt | Website | |
python_descriptors_attribute/howtousepythondictio_44_0.txt | new_dict = dict(
(
("integer", 32), ("float", 5.5),
)
) | |
python_descriptors_attribute/howtousepythondictio_2_0.txt | UNITED STATES __ | |
python_descriptors_attribute/462180_42_0.txt | [ sims0702 ](https://discuss.codecademy.com/u/sims0702) March 16, 2021,
5:08pm 8 | |
python_descriptors_attribute/Peter_Lamut_blog_14_9.txt | ion the addition
is, but that’s the price we have to pay in order to get the Python’s dynamic
nature in exchange. Remember that the same ` add(x, y) ` function we wrote in
[ Part 1 ](https://blog.peterlamut.com/2018/02/04/how-python-
computes-2-5-under-the-hood-part-1/) of this post works out of the box with
different ... | |
python_descriptors_attribute/supportingindexandke_39_0.txt |
Or we could even pass in a floating point number, and it'll convert that into
an integer as well: | |
python_descriptors_attribute/howtousepythondictio_75_0.txt | my_dict = {
"run": run_func,
"reset": reset_func
} | |
python_descriptors_attribute/lookups_61_0.txt |
## Other lookups | |
python_descriptors_attribute/462180_72_0.txt | You can look up values of a dictionary using | |
python_descriptors_attribute/lookups_34_0.txt | ## Project description | |
python_descriptors_attribute/howtousepythondictio_119_0.txt | [ Copyright ](/about/contactus.html#reprints) © 2024 IDG Communications, Inc. | |
python_descriptors_attribute/howtousepythondictio_64_0.txt | ## Gotchas for values in dictionaries | |
python_descriptors_attribute/howtousepythondictio_9_0.txt | * [ About Us ](/about/about.html) |
* [ Contact ](/about/contactus.html) |
* [ Republication Permissions ](/about/contactus.html#reprints) |
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* [ Copyright Notice ](https://foundryco.com/copyright-notice/) |
* [ Terms of Service... | |
python_descriptors_attribute/Peter_Lamut_blog_30_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 m... | |
python_descriptors_attribute/lookups_129_0.txt | ## About PyPI | |
python_descriptors_attribute/supportingindexandke_16_0.txt | ### Sign in to change your settings | |
python_descriptors_attribute/supportingindexandke_75_0.txt | * [ Python Terminology ](https://www.pythonmorsels.com/terms/)
* [ Python Resources ](/resources/)
* [ Python Team Training ](https://truthful.technology)
* [ Trey's Blog ](https://treyhunner.com) | |
python_descriptors_attribute/lookups_115_0.txt | ### Built Distribution | |
python_descriptors_attribute/462180_25_0.txt | [ ionatan ](https://discuss.codecademy.com/u/ionatan) November 20, 2019,
3:26pm 4 | |
python_descriptors_attribute/462180_36_0.txt | Send it to me please | |
python_descriptors_attribute/real_python_0_8.txt | ught()
print(my_deep_thought_instance.meaning_of_life)
print(my_deep_thought_instance.meaning_of_life)
print(my_deep_thought_instance.meaning_of_life)
Copied!
In this example, you can see that just implementing ` .__set__() ` , _even if
it doesn’t do anything at all_ , creates a data descriptor. Now,... | |
python_descriptors_attribute/supportingindexandke_56_0.txt | Need to **fill-in gaps** in your **Python skills** ? I send weekly emails
designed to do just that. | |
python_descriptors_attribute/Peter_Lamut_blog_20_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")
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python_descriptors_attribute/Peter_Lamut_blog_16_2.txt | log.peterlamut.com/2018/02/)
* [ December 2017 ](https://blog.peterlamut.com/2017/12/)
* [ November 2017 ](https://blog.peterlamut.com/2017/11/)
* [ October 2017 ](https://blog.peterlamut.com/2017/10/)
* [ September 2017 ](https://blog.peterlamut.com/2017/09/)
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python_descriptors_attribute/howtousepythondictio_118_0.txt | [  ](https://foundryco.com/) | |
python_descriptors_attribute/lookups_60_0.txt | my_content.remove(child1)
# -> This will invoke call_me_back()
# You can also provide a `concurrent.futures.Executor` when
# creating the content to control how the listeners are called:
# InstanceContent(notify_in: Executor = None). | |
python_descriptors_attribute/Peter_Lamut_blog_14_11.txt | Giving Python slices a name
](https://blog.peterlamut.com/2017/12/30/giving-python-slices-a-name/)
Python makes it easy for a developer to work with sequence types such as
lists, strings, tuples, and others. This is especially true when extracting
sub-sequences from a given sequence.
>>> vowels = ['A',... | |
python_descriptors_attribute/lookups_103_0.txt | 0.2.0 | |
python_descriptors_attribute/lookups_96_0.txt | ## Release history [ Release notifications ](/help/#project-release-
notifications) | [ RSS feed __ ](/rss/project/lookups/releases.xml) | |
python_descriptors_attribute/howtousepythondictio_36_0.txt | ### Values in dictionaries | |
python_descriptors_attribute/howtousepythondictio_117_0.txt | * [ About Us ](/about/about.html)
* [ Contact ](/about/contactus.html)
* [ Republication Permissions ](/about/contactus.html#reprints)
* [ Privacy Policy ](/about/privacy.html)
* [ Cookie Policy ](/about/cookie-policy.html)
* [ Copyright Notice ](https://foundryco.com/copyright-notice/)
* [ Terms of Service ](https://f... | |
python_descriptors_attribute/supportingindexandke_22_0.txt | >>> colors = ["purple", "blue", "green", "pink"]
>>> colors[1]
'blue' | |
python_descriptors_attribute/howtousepythondictio_103_0.txt | Finally, [ Python has another data structure
](https://www.infoworld.com/article/3603949/how-to-unleash-the-power-of-
python-sets.html) , the _set_ , which superficially resembles a dictionary.
Think of it as a dictionary with only keys, but no values. Its syntax is also
similar to a dictionary: | |
python_descriptors_attribute/lookups_86_0.txt | ###### GitHub Statistics | |
python_descriptors_attribute/lookups_140_0.txt | Switch to desktop version | |
python_descriptors_attribute/howtousepythondictio_30_0.txt | The example we see here is called a dictionary _literal_ —a dictionary
structure that is hard-coded into the program's source. It's also possible to
create or modify dictionaries _programmatically_ , as you'll see later on. | |
python_descriptors_attribute/Peter_Lamut_blog_15_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/lookups_62_0.txt | * ` lookups.Lookup.get_default() ` : The default lookup in a system.
* ` lookups.ProxyLookup ` : A lookup that merge results from several lookups.
* ` lookups.DelegatedLookup ` : A lookup that redirects to another (dynamic) lookup, through a LookupProvider.
* ` lookups.EntryPointLookup ` : A lookup loading its instance... | |
python_descriptors_attribute/howtousepythondictio_73_0.txt | First, we store the function object in the dictionary, then we retrieve and
execute it: | |
python_descriptors_attribute/lookups_131_0.txt | ## Contributing to PyPI | |
python_descriptors_attribute/Peter_Lamut_blog_6_1.txt | ces contained in
it: 1
>>> b = Bank() ... | |
python_descriptors_attribute/Peter_Lamut_blog_22_0.txt | Skip to content
[ ](https://blog.peterlamut.com/)
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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/supportingindexandke_0_0.txt | [  ](/) | |
python_descriptors_attribute/Peter_Lamut_blog_33_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/lookups_21_0.txt | ###### Project links | |
python_descriptors_attribute/supportingindexandke_42_0.txt | ## Use ` __getitem__ ` to support index and key lookups | |
python_descriptors_attribute/lookups_118_0.txt | __ Close | |
python_descriptors_attribute/462180_43_0.txt | This does not quite get it… because you are going to be printing the message
Data was not found for every iteration | |
python_descriptors_attribute/Peter_Lamut_blog_2_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/howtousepythondictio_40_0.txt | ### Creating new dictionaries | |
python_descriptors_attribute/Peter_Lamut_blog_8_2.txt | om A'
The actual lookup order can be seen by inspecting the **method resolution
order** (MRO) of a class:
>>> E.__mro__
(__main__.E, __main__.C, __main__.A, __main__.D, __main__.B, object)
Python uses the [ C3 linearization algorithm
](https://en.wikipedia.org/wiki/C3_linearization) to co... | |
python_descriptors_attribute/lookups_5_0.txt | Menu __ | |
python_descriptors_attribute/462180_79_0.txt | This answers the question; thank you very much. | |
python_descriptors_attribute/462180_39_0.txt | The operation you are trying to do with dictionary is not possible. In you
dictionary “directions” has 4 elements and those 4 elements are keys of the
dictionary. When you provide the key of dictionary it will fetch the value of
that particular key. so, i have an alternative option for your operation. | |
python_descriptors_attribute/Peter_Lamut_blog_18_1.txt | opping-into-a-debugger-with-the-
built-in-debugger-function/) Tags [ Debugging
](https://blog.peterlamut.com/tag/debugging/) , [ Python
](https://blog.peterlamut.com/tag/python/) [ 3 Comments on Dropping into a
debugger with the built-in debugger() function
](https://blog.peterlamut.com/2019/06/24/dropping-into-a-deb... | |
python_descriptors_attribute/Peter_Lamut_blog_14_6.txt | nearization) to construct it and to
decide how to traverse the class hierarchy.
## What about metaclasses?
* * *
**Interlude – what is a metaclass?**
Putting it simply, a metaclass is a “thing” that can create a new class in the
same way a class can be used to create new objects, i.e. instances of itself:
* ` ... | |
python_descriptors_attribute/howtousepythondictio_20_0.txt | Table of Contents __ | |
python_descriptors_attribute/lookups_138_0.txt | "PyPI", "Python Package Index", and the blocks logos are registered [
trademarks ](/trademarks/) of the [ Python Software Foundation
](https://www.python.org/psf-landing) . | |
python_descriptors_attribute/lookups_117_0.txt | Uploaded Jul 3, 2021 ` Python 3 ` | |
python_descriptors_attribute/Peter_Lamut_blog_27_1.txt | ed
to string values:
>>> state = fetch_object_state(obj) # assume "Open"
>>> State.NEW == state
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 `... | |
python_descriptors_attribute/lookups_135_0.txt | * * * | |
python_descriptors_attribute/Peter_Lamut_blog_7_0.txt | ���� JFIF ` ` �� ;CREATOR: gd-jpeg v1.0 (using IJG JPEG v62), quality =
90 �� C �� C
�� ` `" ��
�� � } !1AQa"q2���#B��R��$3br�
... | |
python_descriptors_attribute/462180_50_0.txt | Well, I guess you could use this: | |
python_descriptors_attribute/Peter_Lamut_blog_17_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/howtousepythondictio_43_0.txt |
You can also use the ` dict() ` built-in to create a new dictionary from a
sequence of pairs: | |
python_descriptors_attribute/howtousepythondictio_96_0.txt | del movie_titles["Blade Runner"] | |
python_descriptors_attribute/howtousepythondictio_99_0.txt | ## Finding keys by way of values | |
python_descriptors_attribute/lookups_104_0.txt | Feb 6, 2020 | |
python_descriptors_attribute/lookups_102_0.txt |  | |
python_descriptors_attribute/462180_3_0.txt | [ byte3012796714 ](https://discuss.codecademy.com/u/byte3012796714) November
20, 2019, 12:55pm 1 | |
python_descriptors_attribute/Peter_Lamut_blog_14_14.txt | y-more-easily-with-pythons-chainmap/#respond)
## [ Keyword-only arguments in Python
](https://blog.peterlamut.com/2017/11/10/keyword-only-arguments-in-python/)
Python allows you to pass arguments in two ways – either by their position or
by their name (keyword): 1
def foo(x, y):
print(x, y)
... | |
python_descriptors_attribute/howtousepythondictio_105_0.txt |
However, sets are not for storing information associated with a given key.
They're used mainly for storing hashable values in a way that can be quickly
tested for their presence or absence. Also, sets don't preserve insertion
order, as the code they use isn't the same as the code used to create
dictionaries. | |
python_descriptors_attribute/supportingindexandke_61_0.txt | Table of Contents | |
python_descriptors_attribute/462180_69_0.txt | if search_value in user_ids.values():
print('Found it')
else:
print('No such value') | |
python_descriptors_attribute/howtousepythondictio_110_0.txt | Serdar Yegulalp is a senior writer at InfoWorld, focused on machine learning,
containerization, devops, the Python ecosystem, and periodic reviews. | |
python_descriptors_attribute/Peter_Lamut_blog_24_4.txt | ps://blog.peterlamut.com/tag/function-arguments/)
* [ General ](https://blog.peterlamut.com/tag/general/)
* [ Metaclasses ](https://blog.peterlamut.com/tag/metaclasses/)
* [ Python ](https://blog.peterlamut.com/tag/python/)
* [ remote work ](https://blog.peterlamut.com/tag/remote-work/)
* [ Sentinel ](https:/... | |
python_descriptors_attribute/real_python_1_1.txt | nd-args/) [ Share
](https://facebook.com/sharer/sharer.php?u=https%3A//realpython.com/python-
kwargs-and-args/) [ Email ](mailto:?subject=Python article for you&body=Check
out this Python
tutorial:%0A%0APython%20args%20and%20kwargs%3A%20Demystified%0A%0Ahttps%3A//realpython.com/python-
kwargs-and-args/)
Table of Conte... | |
python_descriptors_attribute/Peter_Lamut_blog_14_2.txt | of the function to import and run. If importing fails, a warning is issued and the breakpoint is a no-op.
Useful? Tell me what you think!
### Share this:
* [ Twitter ](https://blog.peterlamut.com/2019/06/24/dropping-into-a-debugger-with-the-built-in-debugger-function/?share=twitter "Click to share on Twitter")
... | |
python_descriptors_attribute/Peter_Lamut_blog_6_2.txt | tors/)
* [ Dictionary ](https://blog.peterlamut.com/tag/dictionary/)
* [ Enum ](https://blog.peterlamut.com/tag/enum/)
* [ Function arguments ](https://blog.peterlamut.com/tag/function-arguments/)
* [ General ](https://blog.peterlamut.com/tag/general/)
* [ Metaclasses ](https://blog.peterlamut.com/tag/metacla... | |
python_descriptors_attribute/462180_5_0.txt | > ### Question
>
> In this [ exercise ](https://www.codecademy.com/courses/learn-python-
> dictionaries/lessons/using-dictionaries/exercises/safe-get-key) , the `
> get() ` method return is assigned to a variable even if nothing is return.
> Is it possible to use the method without assigning the result to a variable?
... | |
python_descriptors_attribute/462180_47_0.txt | Here ya go! : ) | |
python_descriptors_attribute/real_python_0_5.txt | variables/) , because you can only call `
.__set__() ` on the object. In contrast, you can call ` .__get__() ` on both
the object and the class.
Another important thing to know is that Python descriptors are instantiated
**just once** per class. That means that every single instance of a class
containing a descriptor ... | |
python_descriptors_attribute/Peter_Lamut_blog_8_4.txt | mut.com/tag/debugging/)
* [ Decorators ](https://blog.peterlamut.com/tag/decorators/)
* [ Descriptors ](https://blog.peterlamut.com/tag/descriptors/)
* [ Dictionary ](https://blog.peterlamut.com/tag/dictionary/)
* [ Enum ](https://blog.peterlamut.com/tag/enum/)
* [ Function arguments ](https://blog.peterlamut... | |
python_descriptors_attribute/howtousepythondictio_95_0.txt | Sometimes you need to remove a key/value pair completely from a dictionary.
For this, use the ` del ` built-in: | |
python_descriptors_attribute/real_python_0_6.txt | and that, when your objects get collected, they disappear
from your dictionary.
The best solution here is to simply _not_ store values in the descriptor
itself, but to store them in the _object_ that the descriptor is attached to.
Try this approach next:
Python
# descriptors4.py
class OneDigitNumer... | |
python_descriptors_attribute/462180_61_0.txt | value_lookup(7585946, user_ids) #prints "7585946" is not a value within the dictionary.
value_lookup(123112, user_ids) #prints "123112" is a value within the dictionary. | |
python_descriptors_attribute/Peter_Lamut_blog_19_2.txt | escriptors/)
* [ Dictionary ](https://blog.peterlamut.com/tag/dictionary/)
* [ Enum ](https://blog.peterlamut.com/tag/enum/)
* [ Function arguments ](https://blog.peterlamut.com/tag/function-arguments/)
* [ General ](https://blog.peterlamut.com/tag/general/)
* [ Metaclasses ](https://blog.peterlamut.com/tag/m... | |
python_descriptors_attribute/howtousepythondictio_37_0.txt | Values in dictionaries can be _any_ Python object at all. Here are some
examples of values: | |
python_descriptors_attribute/Peter_Lamut_blog_21_2.txt | stom_svg "Create
a website or blog at WordPress.com")
* [ Subscribe ]() [ Subscribed ]()
* [  Peter Lamut's blog ](https://blog.peterlamut.com)
Sign me up
* Already have a WordPress.com account? [ Log in now. ](https://wordp... | |
python_descriptors_attribute/lookups_81_0.txt | [ 
AxelVoitier ](/user/AxelVoitier/) | |
python_descriptors_attribute/Peter_Lamut_blog_22_1.txt | True
>>> None < -float('inf')
True
>>> None < 'foobar'
True
>>> 'foobar' > -1
True
>>> 'foobar' > 42
True
>>> tuple >= (lambda x: x)
True
>>> type > Ellipsis
True
Oh… of course. It’s Python2 that we use on the project (doh).
You see, Python2 is perfectly happy t... | |
python_descriptors_attribute/howtousepythondictio_80_0.txt | If you need to iterate through a dictionary to inspect all of its keys or
values, there are a few different ways to do it. The most common is to use a `
for ` loop on the dictionary—e.g., ` for item in the_dict ` . This yields up
the _keys_ in the dictionary, which can then be used to retrieve values if
needed: | |
python_descriptors_attribute/Peter_Lamut_blog_14_13.txt |
}
config_file = {
'log_level': 'INFO'
}
cmd_args = {
'max_retries': 2
}
Putting them all together while taking the precedence levels into account,
here’s how the application settings would look like:
>>> settings # all settings put together
{
... | |
python_descriptors_attribute/lookups_54_0.txt | # lookup(cls): get first matching instance
# a_match will be any of parent, child1 or child2
a_parent_match = my_lookup.lookup(ParentClass) | |
python_descriptors_attribute/lookups_68_0.txt | # Original Netbeans authors of Lookup API | |
python_descriptors_attribute/Peter_Lamut_blog_9_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/Peter_Lamut_blog_14_7.txt | ` __dict__ ` (assuming no ` __slots__ ` for the sake of example). If an attribute is there, return it;
* If attribute not in ` instance.__dict__ ` but found in the class hierarchy:
* If (non-data) descriptor, call its ` __get__() ` method;
* If not a descriptor, return the attribute itself;
* If still ... | |
python_descriptors_attribute/howtousepythondictio_121_0.txt | * [ CIO ](https://www.cio.com)
* [ Computerworld ](https://www.computerworld.com)
* [ CSO Online ](https://www.csoonline.com)
* [ InfoWorld ](https://www.infoworld.com)
* [ Network World ](https://www.networkworld.com) | |
python_descriptors_attribute/Peter_Lamut_blog_12_1.txt | the attribute ` x ` into a descriptor:
>>> Foo.x = DescriptorX()
>>> Foo.__dict__['x']
<__main__.DescriptorX at 0x7fa0b2ff3790>
Accessing a descriptor does not simply return it as it is the case with non-
descriptor attributes, but instead invokes its ` __get__() ` method and return
the re... |
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