id stringlengths 16 145 | text stringlengths 1 179k | title stringclasses 1
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|---|---|---|
python_data_model/python_data_model_61_0.txt | #### 3.3.5.2. ___class_getitem___ versus ___getitem___ ¶
Usually, the [ subscription ](expressions.html#subscriptions) of an object
using square brackets will call the ` __getitem__() ` instance method
defined on the objectâs class. However, if the object being subscribed is
itself a class, the class method `... | |
python_data_model/python-setattr6_21_0.txt |
class O:
None
obj = O()
setattr(obj, 'attribute', 42)
print(obj.attribute)
# 42
* * * | |
python_data_model/python_data_model_64_1.txt | lled before the left operandâs non-
reflected method. This behavior allows subclasses to override their
ancestorsâ operations.
object. __iadd__ ( _ self _ , _ other _ ) ¶
object. __isub__ ( _ self _ , _ other _ ) ¶
object. __imul__ ( _ self _ , _ other _ ) ¶
object. __imatmul__ ( _ self ... | |
python_data_model/23210_66_0.txt | this is the code in question.
---
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python_data_model/using-setattr-in-python2_59_0.txt | – denis
May 29, 2016 at 10:38 | |
python_data_model/using-setattr-in-python2_44_0.txt | ## 6 Answers 6
Sorted by: Reset to default | |
python_data_model/using-setattr-in-python2_97_0.txt | The return value of ` setattr ` is None. It is an operation that is performed
and does a task, but does not return a value. Similar to calling something
like ` exit() ` , the operation just runs. Enter python from your shell and
you'll see
a = exit() #exits your program
| |
python_data_model/Simple_statements_1_0.txt | ## 7.1. Expression statements ¶
Expression statements are used (mostly interactively) to compute and write a
value, or (usually) to call a procedure (a function that returns no meaningful
result; in Python, procedures return the value ` None ` ). Other uses of
expression statements are allowed and occasionally us... | |
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python_data_model/python_data_model_46_0.txt | #### 3.3.2.1. Customizing module attribute access ¶
Special names ` __getattr__ ` and ` __dir__ ` can be also used to customize
access to module attributes. The ` __getattr__ ` function at the module level
should accept one argument which is the name of an attribute and return the
computed value or raise an [ `... | |
python_data_model/Expressions_0_0.txt | [  ](https://www.python.org/)
Theme Auto Light Dark
### [ Table of Contents ](../contents.html)
* 5\. The import system
* 5.1. ` importlib `
* 5.2. Packages
* 5.2.1. Regular packages
* 5.2.2. Namespace packages
* 5.3. Searching
* 5.3.1. The m... | |
python_data_model/using-setattr-in-python2_26_0.txt | ` setattr ` builds a house and gives it a name so you can call in on it later.
You could potentially rebuild this house, or go to a particular place if you
are unable to find it. \-- ` setattr ` makes an attribute name and gives, or
changes it's value, to be called on later Perhaps a user turns sound off, then
future m... | |
python_data_model/using-setattr-in-python2_46_0.txt | The Python docs say all that needs to be said, as far as I can see.
> ### ` setattr ` ( object , name , value )
>
> This is the counterpart of ` getattr() ` . The arguments are an object, a
> string and an arbitrary value. The string may name an existing attribute or
> a new attribute. The function assigns t... | |
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python_data_model/The_import_system_5_1.txt | ache "sys.path_importer_cache") . The
` __path__ ` attributes on package objects are also used. These provide
additional ways that the import machinery can be customized.
[ ` sys.path ` ](../library/sys.html#sys.path "sys.path") contains a list of
strings providing search locations for modules and packages. It is in... | |
python_data_model/using-setattr-in-python2_75_0.txt | For example
Employee = type("Employee", (object,), dict())
employee = Employee()
# Set salary to 1000
setattr(employee,"salary", 1000 )
# Get the Salary
value = getattr(employee, "salary")
print(value)
| |
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python_data_model/python_data_model_55_0.txt | #### 3.3.3.5. Executing the class body ¶
The class body is executed (approximately) as ` exec(body, globals(),
namespace) ` . The key difference from a normal call to [ ` exec() `
](../library/functions.html#exec "exec") is that lexical scoping allows the
class body (including any methods) to reference names fr... | |
python_data_model/23210_59_0.txt | samuelcolvin Apr 20, 2022
Author | |
python_data_model/using-setattr-in-python2_119_0.txt | * The Overflow Blog
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python_data_model/23210_49_0.txt | All reactions
6 replies | |
python_data_model/python_data_model_10_0.txt | #### 3.2.5.1. Immutable sequences ¶
An object of an immutable sequence type cannot change once it is created. (If
the object contains references to other objects, these other objects may be
mutable and may be changed; however, the collection of objects directly
referenced by an immutable object cannot change.)
Th... | |
python_data_model/23210_77_0.txt | That's fair I think.
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python_data_model/using-setattr-in-python2_95_0.txt | Add a comment |
1 | |
python_data_model/Chapter1_The_Python_Data_Model_10_0.txt | ## [ Do not sell my personal information
](https://www.oreilly.com/privacy.html?donotsell=show)
[  ](https://www.oreilly.com "home page")
© 2024, O’Reilly Media, Inc. All trademarks and registered trademarks
appearing o... | |
python_data_model/The_import_system_3_2.txt | module only during reload.
The meta path may be traversed multiple times for a single import request. For
example, assuming none of the modules involved has already been cached,
importing ` foo.bar.baz ` will first perform a top level import, calling `
mpf.find_spec("foo", None, None) ` on each meta path finder ( ... | |
python_data_model/using-setattr-in-python2_43_0.txt | Jun 16, 2015 at 0:48
| Show 2 more comments | |
python_data_model/using-setattr-in-python2_18_0.txt | Learn more about Labs
# Using setattr() in python | |
python_data_model/python-setattr6_7_0.txt | ## Syntax setattr()
The ` setattr() ` object has the following syntax: | |
python_data_model/23210_84_0.txt | 1 You must be logged in to vote
All reactions | |
python_data_model/python-setattr6_15_0.txt | Note that this is a very convenient way to create classes with different
attribute names. However, you should consider whether you can improve your
object-oriented modeling because the concept of a class may not be suitable if
the instances don’t have the same attributes.
## Python setattr() vs assignment | |
python_data_model/23210_92_0.txt | * * *
Numbered list | |
python_data_model/using-setattr-in-python2_135_0.txt | 0
__setattr__ breaking code? | |
python_data_model/23210_67_0.txt | Comment options
* | |
python_data_model/python_data_model_3_0.txt | ### 3.2.2. NotImplemented ¶
This type has a single value. There is a single object with this value. This
object is accessed through the built-in name [ ` NotImplemented `
](../library/constants.html#NotImplemented "NotImplemented") . Numeric methods
and rich comparison methods should return this value if they do ... | |
python_data_model/23210_4_0.txt | Host and manage packages
* Security | |
python_data_model/using-setattr-in-python2_25_0.txt | I think I can now explain my own answer! This required a better grasp of self
as an object for me. It's an instance name that gets tagged up with stuff like
attributes.
The class could be a Town, and then. ` getattr ` looks for a house using it's
name so you are ready to call on it soon, and comes up with a different ... | |
python_data_model/23210_70_0.txt | mejrs Apr 20, 2022
Collaborator | |
python_data_model/23210_34_0.txt | Return to top
Discussion options | |
python_data_model/using-setattr-in-python2_27_0.txt |
def run_it(self):
yo = getattr(self, 'get_thing')
answer = yo()
setattr(self, 'deal_accepted', self.use_it) #really ott
no = getattr(self, 'deal_accepted')
no(answer)
Properly corrected code: | |
python_data_model/python_data_model_52_0.txt | #### 3.3.3.2. Resolving MRO entries ¶
object. __mro_entries__ ( _ self _ , _ bases _ ) ¶
If a base that appears in a class definition is not an instance of [ ` type `
](../library/functions.html#type "type") , then an ` __mro_entries__() `
method is searched on the base. If an ` __mro_entries__() ... | |
python_data_model/python_data_model_39_0.txt | #### 3.2.13.3. Traceback objects ¶
Traceback objects represent the stack trace of an [ exception
](../tutorial/errors.html#tut-errors) . A traceback object is implicitly
created when an exception occurs, and may also be explicitly created by
calling [ ` types.TracebackType ` ](../library/types.html#types.Tracebac... | |
python_data_model/Expressions_4_0.txt | ## 5.4. Loading ¶
If and when a module spec is found, the import machinery will use it (and the
loader it contains) when loading the module. Here is an approximation of what
happens during the loading portion of import:
module = None
if spec.loader is not None and hasattr(spec.loader, 'create_mo... | |
python_data_model/23210_46_0.txt | Apr 20, 2022
Author | |
python_data_model/using-setattr-in-python2_143_0.txt | #### Hot Network Questions
* How can they move large amounts of money from the USA to a Swiss bank without getting caught?
* It - Preparatory subject
* Where does length contraction occur towards?
* For community property that is to be divided equally during divorce, can I pay my spouse the equal amount in... | |
python_data_model/using-setattr-in-python2_64_0.txt |
setattr(self, 'name', self.get_thing)
However, that's completely unnecessary for your other code, because you could
just call it directly: | |
python_data_model/using-setattr-in-python2_71_0.txt | – zml
Aug 11, 2017 at 14:09 | |
python_data_model/using-setattr-in-python2_29_0.txt | Share
Improve this question | |
python_data_model/using-setattr-in-python2_102_0.txt | Neuron
5,545 5 5 gold badges 42 42 silver badges 61 61 bronze badges | |
python_data_model/python_data_model_65_0.txt | ### 3.3.9. With Statement Context Managers ¶
A _context manager_ is an object that defines the runtime context to be
established when executing a [ ` with ` ](compound_stmts.html#with)
statement. The context manager handles the entry into, and the exit from, the
desired runtime context for the execution of the bl... | |
python_data_model/The_import_system_4_1.txt | rtError ` ](../library/exceptions.html#ImportError "ImportError") , although any other exception raised during [ ` exec_module() ` ](../library/importlib.html#importlib.abc.Loader.exec_module "importlib.abc.Loader.exec_module") will be propagated.
In many cases, the finder and loader can be the same object; in such... | |
python_data_model/using-setattr-in-python2_79_0.txt | answered Mar 8, 2017 at 10:29
kuldeep Mishra kuldeep Mishra | |
python_data_model/using-setattr-in-python2_52_0.txt | * 14
Thanks. Question, if dot notation is so much more succinct, then why use
setattr at all? | |
python_data_model/using-setattr-in-python2_80_0.txt | 228 2 2 silver badges 4 4 bronze badges
Add a comment | | |
python_data_model/Expressions_1_0.txt | ## 5.1. [ ` importlib ` ](../library/importlib.html#module-importlib
"importlib: The implementation of the import machinery.") ¶
The [ ` importlib ` ](../library/importlib.html#module-importlib "importlib:
The implementation of the import machinery.") module provides a rich API for
interacting with the import sys... | |
python_data_model/23210_23_0.txt | Cancel Submit feedback
# Saved searches | |
python_data_model/using-setattr-in-python2_83_0.txt |
MyClass.memory = configs['memory']
MyClass.colour = configs['colour']
MyClass.charge = configs['charge']
...
However, it is much easier and less verbose to loop over the configs, and `
setattr() ` like so: | |
python_data_model/using-setattr-in-python2_112_0.txt | ### Post as a guest
Name | |
python_data_model/python_data_model_2_0.txt | ### 3.2.1. None ¶
This type has a single value. There is a single object with this value. This
object is accessed through the built-in name ` None ` . It is used to signify
the absence of a value in many situations, e.g., it is returned from functions
that donât explicitly return anything. Its truth value is fa... | |
python_data_model/python_data_model_23_0.txt | #### 3.2.8.6. Built-in functions ¶
A built-in function object is a wrapper around a C function. Examples of
built-in functions are [ ` len() ` ](../library/functions.html#len "len") and
[ ` math.sin() ` ](../library/math.html#math.sin "math.sin") ( [ ` math `
](../library/math.html#module-math "math: Mathematic... | |
python_data_model/using-setattr-in-python2_41_0.txt | Jun 15, 2015 at 17:22
* 5 | |
python_data_model/Simple_statements_6_0.txt | ## 7.6. The ` return ` statement ¶
**return_stmt** ::= "return" [[expression_list](expressions.html#grammar-token-python-grammar-expression_list)]
` return ` may only occur syntactically nested in a function definition, not
within a nested class definition.
If an expression list is present,... | |
python_data_model/23210_82_0.txt | Collaborator
\- | |
python_data_model/Simple_statements_8_0.txt | ## 7.8. The ` raise ` statement ¶
**raise_stmt** ::= "raise" [[expression](expressions.html#grammar-token-python-grammar-expression) ["from" [expression](expressions.html#grammar-token-python-grammar-expression)]]
If no expressions are present, ` raise ` re-raises the exception that is
curr... | |
python_data_model/using-setattr-in-python2_98_0.txt | Setting a to ` print('x') ` performs like exit and like your ` setattr ` ,
however, calling upon a doesn't invoke our method.
a = print('15') #returns 15
a #returns None
| |
python_data_model/using-setattr-in-python2_63_0.txt | You are setting ` self.name ` to the string ` "get_thing" ` , not the
function ` get_thing ` .
If you want ` self.name ` to be a function, then you should set it to one: | |
python_data_model/using-setattr-in-python2_49_0.txt | Karl Knechtel
61.6k 12 12 gold badges 118 118 silver badges 162 162 bronze badges | |
python_data_model/python-setattr6_28_0.txt | While working as a researcher in distributed systems, Dr. Christian Mayer
found his love for teaching computer science students.
To help students reach higher levels of Python success, he founded the
programming education website Finxter.com that has taught exponential skills
to millions of coders worldwide. He’s t... | |
python_data_model/python-setattr6_30_0.txt | Python delattr()
Creating Beautiful Heatmaps with Seaborn | |
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python_data_model/using-setattr-in-python2_48_0.txt | Follow
edited May 30, 2022 at 0:39 | |
python_data_model/Expressions_3_0.txt | ## 5.3. Searching ¶
To begin the search, Python needs the [ fully qualified
](../glossary.html#term-qualified-name) name of the module (or package, but
for the purposes of this discussion, the difference is immaterial) being
imported. This name may come from various arguments to the [ ` import `
](simple_stmts.ht... | |
python_data_model/python_data_model_63_1.txt | which is
treated the same as if the ` __length_hint__ ` method didnât exist at all.
This method is purely an optimization and is never required for correctness.
New in version 3.4.
Note
Slicing is done exclusively with the following three methods. A call like
a[1:2] = b
is translated to
... | |
python_data_model/Expressions_3_2.txt | module only during reload.
The meta path may be traversed multiple times for a single import request. For
example, assuming none of the modules involved has already been cached,
importing ` foo.bar.baz ` will first perform a top level import, calling `
mpf.find_spec("foo", None, None) ` on each meta path finder ( ... | |
python_data_model/Chapter1_The_Python_Data_Model_5_0.txt | ## [ About O’Reilly ](https://www.oreilly.com/about/)
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python_data_model/Execution_model_2_1.txt | he module
containing the code block, and the builtins namespace, the namespace of the
module [ ` builtins ` ](../library/builtins.html#module-builtins "builtins:
The module that provides the built-in namespace.") . The global namespace is
searched first. If the names are not found there, the builtins namespace is
sear... | |
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python_data_model/python_data_model_33_0.txt | ##### 3.2.13.1.1. Special read-only attributes ¶
codeobject. co_name ¶
| The function name
---|---
codeobject. co_qualname ¶
| The fully qualified function name New in version 3.11.
codeobject. co_argcount ¶
| The total number of positional [ parameters ](../glossary.htm... | |
python_data_model/python-setattr6_6_0.txt | Python setattr() - The Ultimate Guide
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python_data_model/using-setattr-in-python2_130_0.txt | 0
Defining attribute with variable name | |
python_data_model/The_import_system_4_0.txt | ## 5.4. Loading ¶
If and when a module spec is found, the import machinery will use it (and the
loader it contains) when loading the module. Here is an approximation of what
happens during the loading portion of import:
module = None
if spec.loader is not None and hasattr(spec.loader, 'create_mo... | |
python_data_model/python_data_model_27_0.txt | ### 3.2.9. Modules ¶
Modules are a basic organizational unit of Python code, and are created by the
[ import system ](import.html#importsystem) as invoked either by the [ `
import ` ](simple_stmts.html#import) statement, or by calling functions such
as [ ` importlib.import_module() `
](../library/importlib.html... | |
python_data_model/using-setattr-in-python2_72_0.txt | * AFAIK not unless you, again, ` setattr ` it on the container function.
– emmeowzing | |
python_data_model/23210_54_0.txt | Collaborator
\- | |
python_data_model/23210_39_0.txt | I use ` object.__setattr__ ` to set attributes while bypassing a custom `
__setattr__ ` method, see here . My Current logic for doing this in rust
is:
static SET_ATTR_CELL: GILOnceCell<PyObject> = GILOnceCell::new();
pub fn get_setattr(py: Python<'_>) -> &PyAny {
SET_ATTR_CELL
... | |
python_data_model/python_data_model_59_0.txt | ### 3.3.5. Emulating generic types ¶
When using [ type annotations ](../glossary.html#term-annotation) , it is
often useful to _parameterize_ a [ generic type ](../glossary.html#term-
generic-type) using Pythonâs square-brackets notation. For example, the
annotation ` list[int] ` might be used to signify a [ ... | |
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