id stringlengths 16 145 | text stringlengths 1 179k | title stringclasses 1
value |
|---|---|---|
python_descriptors_attribute/Peter_Lamut_blog_29_4.txt | igh')
def validate_thresholds(self, key, value):
"""Assure that relative ordering of both values remains consistent."""
if key == 'value_low' and value >= self.value_high:
raise ValueError('value_low must be strictly lower than value_high')
elif key == 'value_high' and value <= s... | |
python_descriptors_attribute/howtousepythondictio_81_0.txt | movie_years = {
"2001: a space odyssey": 1968,
"Blade Runner": 1982
}
for movie in movie_years:
print (movie) | |
python_descriptors_attribute/lookups_7_0.txt | Search PyPI __ Search | |
python_descriptors_attribute/Peter_Lamut_blog_16_0.txt | Skip to content
[ ](https://blog.peterlamut.com/)
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python_descriptors_attribute/Peter_Lamut_blog_1_0.txt | Skip to content
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python_descriptors_attribute/supportingindexandke_40_0.txt | >>> colors[3.2]
'pink' | |
python_descriptors_attribute/Peter_Lamut_blog_28_1.txt | asy
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 must have?
(hint: open space offices tend to be noisy, and noise reduces concentration
and hence produ... | |
python_descriptors_attribute/Peter_Lamut_blog_20_1.txt | s [
collections.ChainMap
](https://docs.python.org/3/library/collections.html#chainmap-objects) , a
handy class that can transparently group multiple dicts together. We just need
to pass it all our settings layers (higher-priority ones first), and ChainMap
takes care of the rest:
>>> from collections imp... | |
python_descriptors_attribute/462180_64_0.txt | As pointed out by [ juju_beans94
](https://discuss.codecademy.com/u/juju_beans94) there is a .values() method,
and you can just use it directly. | |
python_descriptors_attribute/Peter_Lamut_blog_20_2.txt | rs gets an inspiration and
decides that it would be great to sort all keyword parameters alphabetically.
You know, for readability. Before you can express your doubt, he eagerly
refactors the function, swapping the two keyword parameters:
def cat(x, y, strip=True, to_upper=False):
...
If yo... | |
python_descriptors_attribute/462180_32_0.txt | [ byte3012796714 ](https://discuss.codecademy.com/u/byte3012796714) November
20, 2019, 3:30pm 5 | |
python_descriptors_attribute/Peter_Lamut_blog_29_0.txt | Skip to content
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python_descriptors_attribute/lookups_92_0.txt | __ Tags lookup, lookups, dci | |
python_descriptors_attribute/462180_29_0.txt | The value that a dict’s value method returns however, that isn’t a dict and
that has the behaviour you’re looking for. | |
python_descriptors_attribute/supportingindexandke_46_0.txt | Sign up for my Python newsletter where **I share one of my favorite Python
tips every week** . | |
python_descriptors_attribute/real_python_7_0.txt | ## Conclusion
You are now able to use **` *args ` ** and **` **kwargs ` ** to accept a
changeable number of arguments in your functions. You have also learned
something more about the unpacking operators.
You’ve learned:
* What ` *args ` and ` **kwargs ` actually mean
* How to use ` *args ` and ` **kwargs ` in... | |
python_descriptors_attribute/462180_55_0.txt | [ juju_beans94 ](https://discuss.codecademy.com/u/juju_beans94) September 7,
2021, 12:12am 11 | |
python_descriptors_attribute/howtousepythondictio_90_0.txt |
## Ordering in Python dictionaries | |
python_descriptors_attribute/Peter_Lamut_blog_24_2.txt | amut ](https://blog.peterlamut.com/author/peterlamut/) Posted
on [ February 26, 2018 February 26, 2018
](https://blog.peterlamut.com/2018/02/26/how-python-computes-2-5-under-the-
hood-part-2/) Tags [ CPython internals
](https://blog.peterlamut.com/tag/cpython-internals/) , [ Python
](https://blog.peterlamut.com/tag/... | |
python_descriptors_attribute/supportingindexandke_35_0.txt |
` ForgivingIndexer ` accepts a sequence and returns an object that can be
indexed (which in turn, indexes the given sequence): | |
python_descriptors_attribute/Peter_Lamut_blog_19_0.txt | Skip to content
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python_descriptors_attribute/supportingindexandke_27_0.txt |
Any object that implements a ` __getitem__ ` method can be used with that
subscript notation: | |
python_descriptors_attribute/howtousepythondictio_39_0.txt |
Again, to store multiple values in a key, simply use a container type—a list,
dictionary, or tuple—as the value. In the above example, the keys `
"some_list" ` and ` "another_dict" ` hold lists and dictionaries,
respectively. This way, you can create nested structures of any depth needed. | |
python_descriptors_attribute/lookups_2_0.txt | [  ](/) | |
python_descriptors_attribute/lookups_4_0.txt | * [ Help ](/help/)
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python_descriptors_attribute/Peter_Lamut_blog_15_2.txt | November 23, 2021 at 22:20 ](https://blog.peterlamut.com/2019/02/22/enums-
to-replace-hardcoded-string-constants/#comment-550)
Thank you, I’m glad it did! 🙂
[ Like ](https://blog.peterlamut.com/2019/02/22/enums-to-replace-hardcoded-
string-constants/?like_comment=550&_wpnonce=848bf404aa) Like
[ Reply ](https://bl... | |
python_descriptors_attribute/lookups_75_0.txt | ## 0.1.0 - 18 May 2019 | |
python_descriptors_attribute/lookups_70_0.txt | # CHANGELOG | |
python_descriptors_attribute/Peter_Lamut_blog_5_2.txt | wing 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__.... | |
python_descriptors_attribute/Peter_Lamut_blog_17_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_42_0.txt | But ` lookups ` implements a bit more than that: | |
python_descriptors_attribute/lookups_109_0.txt | ](/project/lookups/0.1.0/) | |
python_descriptors_attribute/real_python_4_0.txt | ## Using the Python kwargs Variable in Function Definitions
Okay, now you’ve understood what ` *args ` is for, but what about ` **kwargs `
? ` **kwargs ` works just like ` *args ` , but instead of accepting positional
arguments it accepts keyword (or **named** ) arguments. Take the following
example:
Python ` conca... | |
python_descriptors_attribute/lookups_35_0.txt | [ 
](https://pypi.python.org/pypi/lookups) [  Posted
on [ February 26, 2018 February 26, 2018
](https://blog.peterlamut.com/2018/02/26/how-python-computes-2-5-under-the-
hood-part-2/) Tags [ CPython internals
](https://blog.peterlamut.com/tag/cpython-internals/) , [ Python
](https://blog.peterlamut.com/ta... | |
python_descriptors_attribute/Peter_Lamut_blog_29_6.txt | ttps://blog.peterlamut.com/) [ Create a website or
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* [ Subscribe ]() [ Subscribed ]()
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python_descriptors_attribute/462180_41_0.txt | list and dictionary are two totally different things. | |
python_descriptors_attribute/supportingindexandke_29_0.txt |
So if we want to make our own objects support this subscript notation, all we
need to do is make sure we have **a` __getitem__ ` method ** . | |
python_descriptors_attribute/supportingindexandke_65_0.txt | Want the built-in ` len ` function to work on your Python objects? Your class
needs a ` __len__ ` method! | |
python_descriptors_attribute/Peter_Lamut_blog_24_3.txt | on
interpreter. In CPython, its reference implementation, this is a program
written in C that loops through the bytecode given to it, and interprets the
instructions in it one by one.
The heart of this machinery is implemented in [ Python/ceval.c
](https://github.com/python/cpython/blob/v3.7.0b1/Python/ceval.c) file. ... | |
python_descriptors_attribute/462180_12_0.txt | Is it possible to add an if condition to target the values only? If so, which
one is it? (Sorry, I tried searching for it but did not manage to find it). | |
python_descriptors_attribute/462180_51_0.txt | user_ids = {"teraCoder": 100019, "pythonGuy": 182921, "samTheJavaMaam":
123112, "lyleLoop": 102931, "keysmithKeith": 129384} search_value = 123112 for
i in range(len(list(user_ids.values()))): if (list(user_ids.values())[i] ==
search_value): print("Found it!") print(list(user_ids.items())[i], "at
index:", i) | |
python_descriptors_attribute/lookups_93_0.txt | **Requires:** Python ~=3.7 | |
python_descriptors_attribute/lookups_25_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/howtousepythondictio_55_0.txt | # Set a new movie and year
movie_years["Blade Runner 2049"] = 2017 | |
python_descriptors_attribute/howtousepythondictio_77_0.txt |
Note that we need to define the functions _first_ , then list them in the
dictionary. | |
python_descriptors_attribute/howtousepythondictio_93_0.txt | Previously, Python offered the type [ collections.OrderedDict
](https://docs.python.org/3/library/collections.html#collections.OrderedDict)
as a way to construct dictionaries that preserved insertion order. `
collections.OrderedDict ` is still available in the standard library, mainly
because a lot of existing software... | |
python_descriptors_attribute/howtousepythondictio_100_0.txt | A common question with dictionaries is whether it's possible to find a key by
looking up a value. The short answer is no—at least, not without iterating
through the key/value pairs to find the right value (and thus the right key to
go with it). | |
python_descriptors_attribute/lookups_79_0.txt | _These details have been verified by PyPI_ | |
python_descriptors_attribute/supportingindexandke_13_0.txt | Show captions | |
python_descriptors_attribute/462180_21_0.txt | And by this process I mean: if + the condition (the key + in + the name of the
dictionary) | |
python_descriptors_attribute/462180_20_0.txt | Hello, [ @ionatan ](/u/ionatan) ! Thank you for the in-depth explanation.
However, by ‘searching’ and ‘it’ I was referring to the means, the way, the
process, or the function not literally _a searching within the dictionary_ . | |
python_descriptors_attribute/lookups_116_0.txt | [ lookups-0.3.0-py3-none-any.whl
](https://files.pythonhosted.org/packages/66/1a/ac1a0944d8a4b9e4c7b64b87fa3a074b18c9696f58231f0b074019c71f34/lookups-0.3.0-py3-none-
any.whl) (30.4 kB view hashes ) | |
python_descriptors_attribute/lookups_51_0.txt | class ChildClass(ParentClass):
pass | |
python_descriptors_attribute/howtousepythondictio_5_0.txt | [ ]() | |
python_descriptors_attribute/Peter_Lamut_blog_2_4.txt |
On the other hand, if you are curious what is actually happening behind the
scenes, please keep reading.
The first thing to note is the output in each example immediately after
calling ` Foo.get_name() ` . Our decorator prints the object that is about to
invoke in the very next line, and in the non-working example... | |
python_descriptors_attribute/lookups_136_0.txt | Status: [ all systems operational ](https://status.python.org/ "External
link") | |
python_descriptors_attribute/lookups_1_0.txt | __ Warning Some features may not work without JavaScript. Please try enabling
it if you encounter problems. | |
python_descriptors_attribute/howtousepythondictio_60_0.txt | my_dict["b"] # raises a KeyError exception
my_dict.get("a") # returns 1
my_dict.get("b") # returns None
my_dict.get("b", 0) # returns 0, the supplied default | |
python_descriptors_attribute/lookups_100_0.txt | Jul 3, 2021 | |
python_descriptors_attribute/Peter_Lamut_blog_14_3.txt | d"
The only change is that the ` State ` class now inherits from ` Enum ` ,
suddenly making it more robust:
>>> State.NEW = "Completed"
# AttributeError: Cannot reassign members.
>>> del State.NEW
# AttributeError: State: cannot delete Enum member.
>>> list(State)
[<State.NEW: '... | |
python_descriptors_attribute/lookups_124_0.txt | Hashes for lookups-0.3.0-py3-none-any.whl Algorithm | Hash digest |
---|---|---
SHA256 | ` 432d5f91485e2b92b223bbff3ecf9e1f8c5a5519b8f075d40b8044b6bd9af741
` | Copy
MD5 | ` 2ea94424cdeb831ffecfe968dd84c64b ` | Copy
BLAKE2b-256 | `
661aac1a0944d8a4b9e4c7b64b87fa3a074b18c9696f58231f0b074019c71f34 ` | Copy | |
python_descriptors_attribute/462180_11_0.txt | [ 
%20II 1234×703 25.4 KB ](https://global.discourse-
cdn.com/codecademy/original/5X/2/5/3/8/25387d8ec55e71cf0dd68f7c909a867c49eb753c.png
"%20II") | |
python_descriptors_attribute/supportingindexandke_3_0.txt | * [ Sign Up ](/accounts/signup/?bid=nav-signup)
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python_descriptors_attribute/462180_70_0.txt |
1 Like | |
python_descriptors_attribute/howtousepythondictio_83_0.txt | If we instead used the following: | |
python_descriptors_attribute/real_python_6_2.txt | combination with the unpacking operator ` * ` .
If you name a second variable on the left-hand side of the assignment, Python
will assign the last character of the string to the second variable, while
collecting all remaining characters in the list ` a ` :
Python
>>> *a, b = "RealPython"
>>> ... | |
python_descriptors_attribute/Peter_Lamut_blog_3_0.txt | Skip to content
[ ](https://blog.peterlamut.com/)
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Mostly writings about Python and programming in general
Menu
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python_descriptors_attribute/Peter_Lamut_blog_20_3.txt | ut that’s what we have in Python 2.
* * *
1. The following few examples assume either Python 3, or that ` print_function ` is imported from the ` __future__ ` module if using Python 2. ↩
2. The fourth invocation option, i.e. saying ` foo(x=5, 10) ` , is not listed, because it is a syntax error – positional argu... | |
python_descriptors_attribute/howtousepythondictio_17_0.txt | [ 
](/author/Serdar-Yegulalp/ "Serdar Yegulalp") By [ Serdar Yegulalp
](/author/Serdar-Yegulalp/) | |
python_descriptors_attribute/supportingindexandke_45_0.txt | Need to **fill-in gaps** in your Python skills? | |
python_descriptors_attribute/real_python_6_1.txt | *list3))
Copied!
If you run this example, all three lists are unpacked. Each individual item is
passed to ` my_sum() ` , resulting in the following output:
Shell
$ python sum_integers_args_3.py
45
Copied!
There are other convenient uses of the unpacking operator. For example, say
you ... | |
python_descriptors_attribute/supportingindexandke_1_0.txt | * [ __ Articles ](/articles/)
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python_descriptors_attribute/howtousepythondictio_8_0.txt | More from the Foundry Network | |
python_descriptors_attribute/supportingindexandke_41_0.txt |
It's kind of a "forgiving index" in a sense. This all works because we've
implemented a ` __getitem__ ` method on our class. | |
python_descriptors_attribute/howtousepythondictio_11_0.txt | [ ]() [ ]() | |
python_descriptors_attribute/lookups_37_0.txt | # lookups - Find object instances | |
python_descriptors_attribute/462180_10_0.txt | [ 
iteration%20in%20keys 938×661 28.9 KB ](https://global.discourse-
cdn.com/codecademy/original/5X/f/e/e/9/fee952b8552f8f3b03a584db91f9fd963970f5ac.png
"iteration%20in%20k... | |
python_descriptors_attribute/Peter_Lamut_blog_2_5.txt | n Facebook")
*
Like Loading...
Author [ Peter Lamut ](https://blog.peterlamut.com/author/peterlamut/) Posted
on [ October 17, 2017 October 17, 2017
](https://blog.peterlamut.com/2017/10/17/a... | |
python_descriptors_attribute/howtousepythondictio_66_0.txt | First, if you use a _variable name_ as a value, what's stored under that key
is the value contained in the variable _at the time the dictionary value was
defined_ . Here's an example: | |
python_descriptors_attribute/howtousepythondictio_78_0.txt | Also, Python as of version 3.10 has a feature called [ structural pattern
matching ](https://www.infoworld.com/article/3609208/how-to-use-structural-
pattern-matching-in-python.html) that resembles conventional ` switch/case `
statements. But in Python, it's meant to be used for matching against
_structures_ or combina... | |
python_descriptors_attribute/lookups_120_0.txt | Hashes for lookups-0.3.0.tar.gz Algorithm | Hash digest |
---|---|---
SHA256 | ` 2db6f64e1ba95f35dcf469ffbae5251a4fe2cea2597fc9450e4fff2fc089f607
` | Copy
MD5 | ` afadbdc6312bc6ca7fd60548d92fd4ed ` | Copy
BLAKE2b-256 | `
87db31dea2ecc4342759d3b5c60f5d469735358d660091721dbfb774fa28f071 ` | Copy | |
python_descriptors_attribute/lookups_95_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_114_0.txt | ` ` | |
python_descriptors_attribute/real_python_6_0.txt | ## Unpacking With the Asterisk Operators: ` * ` & ` ** `
You are now able to use ` *args ` and ` **kwargs ` to define Python functions
that take a varying number of input arguments. Let’s go a little deeper to
understand something more about the **unpacking operators** .
The single and double asterisk unpacking oper... | |
python_descriptors_attribute/howtousepythondictio_29_0.txt |
In this dictionary, the movie names are the keys, and the release years are
the values. The structure ` {key: value, key: value ... } ` can be repeated
indefinitely. | |
python_descriptors_attribute/howtousepythondictio_101_0.txt | If you find yourself in a situation where you need to find keys by way of
their values, as well as values by way of their keys, consider keeping two
dictionaries, where one of them has the keys and values inverted. However, you
can't do this if the values you're storing aren't hashable. In a case like
that, you'll have... | |
python_descriptors_attribute/Peter_Lamut_blog_3_1.txt | >>> Foo.get_name
<bound method Foo.get_name of <class '__main__.Foo'>>
>>> Foo.__dict__['get_name'].__get__(None, Foo)
<bound method Foo.get_name of <class '__main__.Foo'>>
` __get__() ` gets called with two parameters – the object instance the
attribute belongs to ( ` None ` here, because accessing... | |
python_descriptors_attribute/lookups_10_0.txt | [ Latest version ](/project/lookups/) | |
python_descriptors_attribute/Peter_Lamut_blog_14_1.txt | nippet to demonstrate all three
possible outcomes, and how they can be handled with just a single dictionary
lookup.
### Share this:
* [ Twitter ](https://blog.peterlamut.com/2020/04/01/distinguishing-between-none-and-missing-values-in-dictionaries-with-a-sentinel/?share=twitter "Click to share on Twitter")
* [... | |
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python_descriptors_attribute/lookups_16_0.txt | _These details have been verified by PyPI_ | |
python_descriptors_attribute/real_python_7_1.txt | of expert Pythonistas:**
[ Level Up Your Python Skills »
](/account/join/?utm_source=rp_article_footer&utm_content=python-kwargs-and-
args)
Master _ Real-World Python Skills _
With Unlimited Access to Real Python
**Join us and get access to thousands of tutoria... | |
python_descriptors_attribute/lookups_98_0.txt |  | |
python_descriptors_attribute/Peter_Lamut_blog_33_1.txt | snippet to demonstrate all three
possible outcomes, and how they can be handled with just a single dictionary
lookup.
### Share this:
* [ Twitter ](https://blog.peterlamut.com/2020/04/01/distinguishing-between-none-and-missing-values-in-dictionaries-with-a-sentinel/?share=twitter "Click to share on Twitter")
*... | |
python_descriptors_attribute/supportingindexandke_15_0.txt | Auto-expand | |
python_descriptors_attribute/462180_54_0.txt | 1 Like | |
python_descriptors_attribute/lookups_18_0.txt | [ 
AxelVoitier ](/user/AxelVoitier/) |
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