id stringlengths 16 145 | text stringlengths 1 179k | title stringclasses 1
value |
|---|---|---|
python_descriptors_attribute/Peter_Lamut_blog_5_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 res... | |
python_descriptors_attribute/lookups_59_0.txt | ... | |
python_descriptors_attribute/howtousepythondictio_3_0.txt | * [ United States ](/)
* [ United Kingdom ](/uk/) | |
python_descriptors_attribute/Peter_Lamut_blog_27_0.txt | Skip to content
[ ](https://blog.peterlamut.com/)
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Menu
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python_descriptors_attribute/lookups_108_0.txt | May 18, 2019 | |
python_descriptors_attribute/462180_68_0.txt | This one is too complex tbh. You could just write this, | |
python_descriptors_attribute/Peter_Lamut_blog_5_4.txt | ary 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/462180_6_0.txt | * * * | |
python_descriptors_attribute/462180_48_0.txt | 1 Like | |
python_descriptors_attribute/462180_74_0.txt | method | |
python_descriptors_attribute/462180_26_0.txt | Testing for key membership is directly related to the purpose of dict, that’s
what it provides, that’s why … it provides that operation | |
python_descriptors_attribute/462180_52_0.txt | Alternatively, you could also take in a user’s input and make it a whole
program 
But as [ @ionatan ](/u/ionatan) said: why not just use lists at this point? | |
python_descriptors_attribute/howtousepythondictio_45_0.txt |
Another way to build a dictionary is with a _dictionary comprehension_ , where
you specify keys and values from a sequence: | |
python_descriptors_attribute/462180_44_0.txt | it could be done with defining a function for example
same code but the else statement will just be outside of the loop (without the
else: ofcourse)
and you will be using return | |
python_descriptors_attribute/462180_30_0.txt | There’s also no reason to shy away from changing data types, re-shaping your
data can be thought of as a computation, there’s nothing wrong with that, if
anything it probably makes your life easier if you’re willing to reshape
things to fit the operations that you’re going to do. (At least, this makes
sense as long as ... | |
python_descriptors_attribute/462180_78_0.txt | > bably a shorter way to | |
python_descriptors_attribute/Peter_Lamut_blog_14_18.txt | eterlamut.com/2019/06/)
* [ February 2019 ](https://blog.peterlamut.com/2019/02/)
* [ November 2018 ](https://blog.peterlamut.com/2018/11/)
* [ May 2018 ](https://blog.peterlamut.com/2018/05/)
* [ February 2018 ](https://blog.peterlamut.com/2018/02/)
* [ December 2017 ](https://blog.peterlamut.com/2017/12/)
... | |
python_descriptors_attribute/lookups_14_0.txt | * __ Project description
* __ Release history
* __ Download files | |
python_descriptors_attribute/supportingindexandke_71_0.txt | * [ Team Plans ](/python-team-learning/)
* [ Skill Levels ](/tracks/)
* [ Pricing ](/pricing/)
* [ Discounts ](/discounts/) | |
python_descriptors_attribute/howtousepythondictio_41_0.txt | You can create a new, empty dictionary by simply declaring: | |
python_descriptors_attribute/lookups_63_0.txt | # Individual Contributors | |
python_descriptors_attribute/howtousepythondictio_86_0.txt | If we just want the values, we can iterate with the ` .values() ` method
available on dictionaries: | |
python_descriptors_attribute/Peter_Lamut_blog_14_8.txt | (https://github.com/python/cpython/blob/v3.7.0b1/Objects/abstract.c#L781-L816)
function located in ` Objects/abstract.c ` file:
static PyObject *
binary_op1(PyObject *v, PyObject *w, const int op_slot)
{
PyObject *x;
binaryfunc slotv = NULL;
binaryfunc slotw = NULL;
... | |
python_descriptors_attribute/lookups_50_0.txt | # Adds some objects
class ParentClass:
pass | |
python_descriptors_attribute/lookups_32_0.txt | * **Development Status**
* [ 4 - Beta ](/search/?c=Development+Status+%3A%3A+4+-+Beta)
* **Intended Audience**
* [ Developers ](/search/?c=Intended+Audience+%3A%3A+Developers)
* **License**
* [ OSI Approved :: Mozilla Public License 2.0 (MPL 2.0) ](/search/?c=License+%3A%3A+OSI+Approved+%3A%3A+Mozilla+Public+License+2.... | |
python_descriptors_attribute/howtousepythondictio_59_0.txt | my_dict = {"a":1} | |
python_descriptors_attribute/howtousepythondictio_92_0.txt | This wasn't always the case. Before Python 3.6, items in a dictionary wouldn't
be returned in any particular order if you iterated through them. Version 3.6
introduced a new and more efficient dictionary algorithm, which retained
insertion order for keys as a convenient side effect. | |
python_descriptors_attribute/howtousepythondictio_69_0.txt | A similar rule applies to how function outputs work as dictionary values. For
the key ` "function_output" ` , we have ` some_func() ` . This means when the
dictionary is defined, ` some_func() ` is executed, and the returned value is
used as the value for ` "function_output" ` . But ` some_func() ` is _not_ re-
execute... | |
python_descriptors_attribute/supportingindexandke_69_0.txt | * [ Python Tips ](/newsletter/)
* [ Testimonials ](/testimonials/)
* [ How It Works ](/features/)
* [ Redeem Code ](/redeem/) | |
python_descriptors_attribute/supportingindexandke_62_0.txt | * __
* | |
python_descriptors_attribute/lookups_125_0.txt | Close | |
python_descriptors_attribute/lookups_0_0.txt | Skip to main content Switch to mobile version | |
python_descriptors_attribute/lookups_80_0.txt | ###### Maintainers | |
python_descriptors_attribute/howtousepythondictio_14_0.txt | # How to use Python dictionaries | |
python_descriptors_attribute/Peter_Lamut_blog_20_4.txt | bsite or blog at WordPress.com")
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python_descriptors_attribute/lookups_15_0.txt | ### Verified details | |
python_descriptors_attribute/supportingindexandke_28_0.txt | >>> fruit_counts.__getitem__("pear")
2 | |
python_descriptors_attribute/howtousepythondictio_53_0.txt | # to access a property of an object in a dictionary:
another_dict["some_obj"].property | |
python_descriptors_attribute/lookups_57_0.txt | # Lookup result listener
def call_me_back(result):
print('Result changed. Instances are now', result.all_instances()) | |
python_descriptors_attribute/Peter_Lamut_blog_5_3.txt | t is probably the ` __getattr__() ` method that
you want to override.
## Summary
Accessing an attribute on a (new-style) class instance invokes the `
__getattribute__() ` method that performs the following:
* Check the class hierarchy using MRO (but do not examine metaclasses):
* If a data (overriding) descr... | |
python_descriptors_attribute/howtousepythondictio_56_0.txt |
### Using .get() to safely retrieve dictionary values | |
python_descriptors_attribute/supportingindexandke_14_0.txt | Autoplay | |
python_descriptors_attribute/Peter_Lamut_blog_12_3.txt | it is probably the ` __getattr__() ` method that
you want to override.
## Summary
Accessing an attribute on a (new-style) class instance invokes the `
__getattribute__() ` method that performs the following:
* Check the class hierarchy using MRO (but do not examine metaclasses):
* If a data (overriding) desc... | |
python_descriptors_attribute/Peter_Lamut_blog_9_2.txt | ed string constants
](https://blog.peterlamut.com/2019/02/22/enums-to-replace-hardcoded-string-
constants/)
[ Next Next post: Distinguishing between None and missing values in
dictionaries with a sentinel
](https://blog.peterlamut.com/2020/04/01/distinguishing-between-none-and-
missing-values-in-dictionaries-with-a-... | |
python_descriptors_attribute/supportingindexandke_25_0.txt |
Putting square brackets after an object and passing something into those
brackets is called **subscript notation** . This syntax is powered by the `
__getitem__ ` method (pronounced " [ dunder
](https://www.pythonmorsels.com/what-are-dunder-methods/) get item"): | |
python_descriptors_attribute/howtousepythondictio_54_0.txt |
Setting a value in a dictionary is simple enough: | |
python_descriptors_attribute/howtousepythondictio_87_0.txt | for value in movie_years.values(): | |
python_descriptors_attribute/Peter_Lamut_blog_2_2.txt | example, but it is instead retrieved
from ` A ` :
>>> A.x = 'x from A'
>>> e_inst.x
'x from 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, o... | |
python_descriptors_attribute/lookups_130_0.txt | * [ PyPI Blog ](https://blog.pypi.org "External link")
* [ Infrastructure dashboard ](https://dtdg.co/pypi "External link")
* [ Statistics ](/stats/)
* [ Logos & trademarks ](/trademarks/)
* [ Our sponsors ](/sponsors/) | |
python_descriptors_attribute/supportingindexandke_20_0.txt | ## Index and key lookups both use square brackets | |
python_descriptors_attribute/Peter_Lamut_blog_8_3.txt | style) class instance invokes the `
__getattribute__() ` method that performs the following:
* Check the class hierarchy using MRO (but do not examine metaclasses):
* If a data (overriding) descriptor is found in class hierarchy, call its ` __get__() ` method;
* Otherwise check the instance ` __dict__ ` (ass... | |
python_descriptors_attribute/supportingindexandke_74_0.txt | Related Resources | |
python_descriptors_attribute/lookups_58_0.txt | parent_result.add_lookup_listener(call_me_back) | |
python_descriptors_attribute/howtousepythondictio_94_0.txt | ## Removing items from dictionaries | |
python_descriptors_attribute/lookups_85_0.txt | * [ __ Homepage ](https://github.com/AxelVoitier/lookups) | |
python_descriptors_attribute/Peter_Lamut_blog_11_1.txt | rlamut.com/2018/11/)
* [ May 2018 ](https://blog.peterlamut.com/2018/05/)
* [ February 2018 ](https://blog.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/)
* [... | |
python_descriptors_attribute/462180_67_0.txt | [ rza-huseynov ](https://discuss.codecademy.com/u/rza-huseynov) February 6,
2022, 3:19am 13 | |
python_descriptors_attribute/462180_19_0.txt | [ byte3012796714 ](https://discuss.codecademy.com/u/byte3012796714) November
20, 2019, 3:22pm 3 | |
python_descriptors_attribute/Peter_Lamut_blog_17_3.txt | probably the ` __getattr__() ` method that
you want to override.
## Summary
Accessing an attribute on a (new-style) class instance invokes the `
__getattribute__() ` method that performs the following:
* Check the class hierarchy using MRO (but do not examine metaclasses):
* If a data (overriding) descripto... | |
python_descriptors_attribute/Peter_Lamut_blog_10_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_35_0.txt | Hey [ @byte3012796714 ](/u/byte3012796714) , what is the name of this
text/code editor you took screenshot? It looks like a good light program! | |
python_descriptors_attribute/lookups_77_0.txt | ## Project details | |
python_descriptors_attribute/Peter_Lamut_blog_14_15.txt | different separator is through
an explicit keyword argument. To complete the picture, we just need to prevent
the callers to pass in too many positional arguments, and we can do this with
a simple check if ` args ` is not empty:
if args:
raise TypeError('Too many positional arguments given.')
... | |
python_descriptors_attribute/howtousepythondictio_62_0.txt | Using Python dictionaries makes the most sense under the following conditions: | |
python_descriptors_attribute/Peter_Lamut_blog_23_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_76_0.txt | * Initial dump of code.
* Defines the public API for lookups.
* Provides fixed lookup: members are defined at instantiation time and never change.
* Provides singleton lookup: only one member defined at instantiation time and never change.
* Provides empty lookup: a special lookup with nothing in it. | |
python_descriptors_attribute/Peter_Lamut_blog_14_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_107_0.txt | * [ Why companies are leaving the cloud ](https://www.infoworld.com/article/3712861/why-companies-are-leaving-the-cloud.html)
* [ 5 easy ways to run an LLM locally ](https://www.infoworld.com/article/3705035/5-easy-ways-to-run-an-llm-locally.html)
* [ Coding with AI: Tips and best practices from developers ](https://ww... | |
python_descriptors_attribute/lookups_3_0.txt | Search PyPI __ Search | |
python_descriptors_attribute/lookups_26_0.txt | ###### Meta | |
python_descriptors_attribute/lookups_38_0.txt | [ DCI ](https://en.wikipedia.org/wiki/Data,_context_and_interaction) lookups
for Python (inspired by Netbeans Platform [ Lookups API
](http://wiki.netbeans.org/DevFaqLookup) ) | |
python_descriptors_attribute/howtousepythondictio_58_0.txt | The ` .get() ` method on a dictionary attempts to find a value associated with
a given key. If no such value exists, it returns ` None ` or a default that
you specify. In some situations you'll want to explicitly raise an error, but
much of the time you'll just want to supply a sane default. | |
python_descriptors_attribute/462180_81_0.txt | Powered by [ Discourse ](https://www.discourse.org) , best viewed with
JavaScript enabled | |
python_descriptors_attribute/Peter_Lamut_blog_14_16.txt | @logged
@classmethod
def get_name(cls):
return cls.__name__
As the docstring explains, the ` logged ` decorator simply prints a message
before invoking the decorated function, and it is applied to the ` get_name()
` class method of the class ` Foo ` . The ` @wraps ` decorator makes su... | |
python_descriptors_attribute/supportingindexandke_50_0.txt | You can overload many operators, protocols, and bits of functionality on your
Python objects by implementing dunder methods. | |
python_descriptors_attribute/supportingindexandke_54_0.txt |  [ __ ](https://www.linkedin.com/sharing/share-
offsite/?url=https%3A//www.py... | |
python_descriptors_attribute/Peter_Lamut_blog_25_1.txt | ping-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-debug... | |
python_descriptors_attribute/howtousepythondictio_52_0.txt | example_values["another_dict"]["Blade Runner"] # yields 1982
# or ...
another_dict = example_values["another_dict"]
another_dict["Blade Runner"] | |
python_descriptors_attribute/lookups_73_0.txt | ## 0.2.0 - 06 February 2020 | |
python_descriptors_attribute/supportingindexandke_6_0.txt | Copied to clipboard. | |
python_descriptors_attribute/lookups_71_0.txt | ## 0.3.0 - XX XXXXXXXX 2021 | |
python_descriptors_attribute/Peter_Lamut_blog_15_3.txt | eterlamut.com/2017/11/)
* [ October 2017 ](https://blog.peterlamut.com/2017/10/)
* [ September 2017 ](https://blog.peterlamut.com/2017/09/)
* [ Home ](/)
* [ Twitter ](https://twitter.com/plamut "Twitter: @plamut")
* [ GitHub ](https://github.com/plamut "GitHub: plamut")
* [ StackOverflow ](https://sta... | |
python_descriptors_attribute/howtousepythondictio_79_0.txt | ## Iterating through dictionaries | |
python_descriptors_attribute/howtousepythondictio_74_0.txt | def run_func(a1, a2):
...
def reset_func(a1, a2):
... | |
python_descriptors_attribute/supportingindexandke_34_0.txt | def __getitem__(self, index):
return self.sequence[int(index)] | |
python_descriptors_attribute/462180_75_0.txt | xx = {1: 11, 2: 22} if 11 in xx.values(): print("yes") #this prints yes | |
python_descriptors_attribute/howtousepythondictio_82_0.txt |
This call would yield ` "2001: a space odyssey" ` , then ` "Blade Runner" ` . | |
python_descriptors_attribute/howtousepythondictio_46_0.txt | new_dict = {x:x+1 for x in range(3)}
# {0: 1, 1: 2, 2: 3} | |
python_descriptors_attribute/462180_15_0.txt | [ ionatan ](https://discuss.codecademy.com/u/ionatan) November 20, 2019,
1:19pm 2 | |
python_descriptors_attribute/lookups_88_0.txt | View statistics for this project via [ Libraries.io
](https://libraries.io/pypi/lookups "External link") , or by using [ our
public dataset on Google BigQuery
](https://packaging.python.org/guides/analyzing-pypi-package-downloads/) | |
python_descriptors_attribute/462180_22_0.txt | My question was **if there is another way of pointing to the value (as easy as
you do it with the key, by just mentioning it) in the expression, instead of
just using` .value() ` method ** . | |
python_descriptors_attribute/howtousepythondictio_25_0.txt | In this article, we'll walk through the basics of Python dictionaries,
including how to use them, the scenarios where they make sense, and some
common issues and pitfalls to be aware of. | |
python_descriptors_attribute/462180_1_0.txt | # [ Is there a way to lookup a value in a dictionary? ](/t/is-there-a-way-to-
lookup-a-value-in-a-dictionary/462180) | |
python_descriptors_attribute/462180_24_0.txt | 1 Like | |
python_descriptors_attribute/lookups_89_0.txt | ###### Meta | |
python_descriptors_attribute/lookups_30_0.txt | **Requires:** Python ~=3.7 | |
python_descriptors_attribute/supportingindexandke_43_0.txt | To allow square brackets to work on your object, you can **implement a`
__getitem__ ` method ** . You'll most often see this done in list-like objects
(a.k.a. [ sequences ](https://www.pythonmorsels.com/sequence/) ), or
dictionary-like objects (a.k.a. [ mappings
](https://www.pythonmorsels.com/terms/#mapping) ). | |
python_descriptors_attribute/Peter_Lamut_blog_33_2.txt | _svg "Create
a website or blog at WordPress.com")
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