id stringlengths 16 145 | text stringlengths 1 179k | title stringclasses 1
value |
|---|---|---|
python_data_model/using-setattr-in-python2_28_0.txt |
def run_it(self):
value_returned = self.get_thing()
self.use_it(value_returned)
* python
* setattr | |
python_data_model/python_data_model_54_0.txt | #### 3.3.3.4. Preparing the class namespace ¶
Once the appropriate metaclass has been identified, then the class namespace
is prepared. If the metaclass has a ` __prepare__ ` attribute, it is called
as ` namespace = metaclass.__prepare__(name, bases, **kwds) ` (where the
additional keyword arguments, if any,... | |
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python_data_model/python_data_model_22_0.txt | #### 3.2.8.5. Asynchronous generator functions ¶
A function or method which is defined using [ ` async def `
](compound_stmts.html#async-def) and which uses the [ ` yield `
](simple_stmts.html#yield) statement is called a _asynchronous generator
function_ . Such a function, when called, returns an [ asynchronou... | |
python_data_model/The_import_system_9_1.txt | 024, Python Software Foundation.
This page is licensed under the Python Software Foundation License Version 2.
Examples, recipes, and other code in the documentation are additionally
licensed under the Zero Clause BSD License.
See [ History and License ](/license.html) for more information.
The Python Softwa... | |
python_data_model/python_data_model_66_0.txt | ### 3.3.10. Customizing positional arguments in class pattern matching ¶
When using a class name in a pattern, positional arguments in the pattern are
not allowed by default, i.e. ` case MyClass(x, y) ` is typically invalid
without special support in ` MyClass ` . To be able to use that kind of
pattern, the cl... | |
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python_data_model/23210_32_0.txt | samuelcolvin asked this question in Questions
Is there a way (without eval) to access object.__setattr__ #2321 | |
python_data_model/using-setattr-in-python2_30_0.txt | Follow
edited Mar 7, 2012 at 5:16 | |
python_data_model/23210_75_0.txt | ####
samuelcolvin Apr 20, 2022 | |
python_data_model/python_data_model_18_0.txt | ##### 3.2.8.1.2. Special writable attributes ¶
Most of these attributes check the type of the assigned value:
Attribute | Meaning
---|---
function. __doc__ ¶
| The functionâs documentation string, or ` None ` if unavailable. Not
inherited by subclasses.
function. __name__ ¶
| ... | |
python_data_model/Simple_statements_11_2.txt | ore a future statement are:
* the module docstring (if any),
* comments,
* blank lines, and
* other future statements.
The only feature that requires using the future statement is ` annotations `
(see [ **PEP 563** ](https://peps.python.org/pep-0563/) ).
All historical features enabled by the future... | |
python_data_model/using-setattr-in-python2_76_0.txt | Share
Improve this answer | |
python_data_model/Chapter1_The_Python_Data_Model_4_3.txt | discussed in [
“Further Reading” ](ch11.html#interfaces_further_reading) of [ Chapter 11
](ch11.html#ifaces_prot_abc) .
[ 1 ](ch01.html#idm139636571282336-marker) [ Story of Jython
](http://hugunin.net/story_of_jython.html) , written as a Foreword to [
_Jython Essentials_ ](http://bit.ly/jython-essentials) (O’Reilly, ... | |
python_data_model/using-setattr-in-python2_50_0.txt | answered Mar 5, 2012 at 3:15
Chris Morgan Chris Morgan | |
python_data_model/python_data_model_58_0.txt | ### 3.3.4. Customizing instance and subclass checks ¶
The following methods are used to override the default behavior of the [ `
isinstance() ` ](../library/functions.html#isinstance "isinstance") and [ `
issubclass() ` ](../library/functions.html#issubclass "issubclass") built-in
functions.
In particular, the ... | |
python_data_model/using-setattr-in-python2_132_0.txt | See more linked questions
#### Related | |
python_data_model/python_data_model_75_0.txt | #### Previous topic
[ 2\. Lexical analysis ](lexical_analysis.html "previous chapter")
| |
python_data_model/Simple_statements_2_2.txt | ment is the combination, in a single statement, of a binary
operation and an assignment statement:
**augmented_assignment_stmt** ::= augtarget augop ([expression_list](expressions.html#grammar-token-python-grammar-expression_list) | [yield_expression](expressions.html#grammar-token-python-grammar-yield_... | |
python_data_model/Simple_statements_5_0.txt | ## 7.5. The ` del ` statement ¶
**del_stmt** ::= "del" target_list
Deletion is recursively defined very similar to the way assignment is defined.
Rather than spelling it out in full details, here are some hints.
Deletion of a target list recursively deletes each target, from left to right.
... | |
python_data_model/The_import_system_6_0.txt | ## 5.6. Replacing the standard import system ¶
The most reliable mechanism for replacing the entire import system is to
delete the default contents of [ ` sys.meta_path `
](../library/sys.html#sys.meta_path "sys.meta_path") , replacing them entirely
with a custom meta path hook.
If it is acceptable to only alter... | |
python_data_model/python_data_model_20_0.txt | #### 3.2.8.3. Generator functions ¶
A function or method which uses the [ ` yield ` ](simple_stmts.html#yield)
statement (see section [ The yield statement ](simple_stmts.html#yield) ) is
called a _generator function_ . Such a function, when called, always returns
an [ iterator ](../glossary.html#term-iterator)... | |
python_data_model/23210_11_0.txt | * All features
* Documentation
* GitHub Skills
* Blog
* Solutions | |
python_data_model/23210_48_0.txt |
pub fn force_setattr<N, V>(obj: &PyObject, py: Python<'_>, attr_name: N, value: V) -> PyResult<()>
where
N: ToPyObject,
V: ToPyObject,
{
attr_name.with_borrowed_ptr(py, move |attr_name| {
value.with_borrowed_ptr(py, |value| unsafe {
error_on_minu... | |
python_data_model/python_data_model_21_0.txt | #### 3.2.8.4. Coroutine functions ¶
A function or method which is defined using [ ` async def `
](compound_stmts.html#async-def) is called a _coroutine function_ . Such a
function, when called, returns a [ coroutine ](../glossary.html#term-
coroutine) object. It may contain [ ` await ` ](expressions.html#await... | |
python_data_model/using-setattr-in-python2_70_0.txt | Mar 5, 2012 at 4:10
* Is there a way to access the attribute's name ` 'name' ` inside the ` get_thing() ` function ? | |
python_data_model/python_data_model_56_0.txt | #### 3.3.3.6. Creating the class object ¶
Once the class namespace has been populated by executing the class body, the
class object is created by calling ` metaclass(name, bases, namespace,
**kwds) ` (the additional keywords passed here are the same as those passed
to ` __prepare__ ` ).
This class object is t... | |
python_data_model/23210_68_0.txt | # {{title}}
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python_data_model/23210_24_0.txt | ## Use saved searches to filter your results more quickly
Name | |
python_data_model/python_data_model_70_0.txt | ### 3.4.1. Awaitable Objects ¶
An [ awaitable ](../glossary.html#term-awaitable) object generally implements
an ` __await__() ` method. [ Coroutine objects ](../glossary.html#term-
coroutine) returned from [ ` async def ` ](compound_stmts.html#async-def)
functions are awaitable.
Note
The [ generator iterat... | |
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lang-py | |
python_data_model/Simple_statements_7_0.txt | ## 7.7. The ` yield ` statement ¶
**yield_stmt** ::= [yield_expression](expressions.html#grammar-token-python-grammar-yield_expression)
A ` yield ` statement is semantically equivalent to a [ yield expression
](expressions.html#yieldexpr) . The yield statement can be used to omit the
parent... | |
python_data_model/The_import_system_2_1.txt | may
not be physically located next to ` parent/two ` . In this case, Python will
create a namespace package for the top-level ` parent ` package whenever it
or one of its subpackages is imported.
See also [ **PEP 420** ](https://peps.python.org/pep-0420/) for the namespace
package specification.
| |
python_data_model/Simple_statements_11_1.txt | foo.bar.baz as fbb # foo, foo.bar, and foo.bar.baz imported, foo.bar.baz bound as fbb
from foo.bar import baz # foo, foo.bar, and foo.bar.baz imported, foo.bar.baz bound as baz
from foo import attr # foo imported and foo.attr bound as attr
If the list of identifiers is replaced by a star ( ` '*... | |
python_data_model/Simple_statements_12_0.txt | ## 7.12. The ` global ` statement ¶
**global_stmt** ::= "global" [identifier](lexical_analysis.html#grammar-token-python-grammar-identifier) ("," [identifier](lexical_analysis.html#grammar-token-python-grammar-identifier))*
The ` global ` statement is a declaration which holds for the entir... | |
python_data_model/using-setattr-in-python2_107_0.txt | But avoid …
* Asking for help, clarification, or responding to other answers.
* Making statements based on opinion; back them up with references or personal experience. | |
python_data_model/Execution_model_2_2.txt | s immediately within a class scope, or within another annotation scope that is immediately within a class scope, the code in the annotation scope can use names defined in the class scope as if it were executed directly within the class body. This contrasts with regular functions defined within classes, which cannot acc... | |
python_data_model/python_data_model_49_1.txt | h classes have the same ___slots___ .
* [ Multiple inheritance ](../tutorial/classes.html#tut-multiple) with multiple slotted parent classes can be used, but only one parent is allowed to have attributes created by slots (the other bases must have empty slot layouts) - violations raise [ ` TypeError ` ](../librar... | |
python_data_model/using-setattr-in-python2_40_0.txt | @monkut, why shouldn't one use strings as comments?
– Haleemur Ali | |
python_data_model/Chapter1_The_Python_Data_Model_0_2.txt | g 13 cards at a time:
>>> deck[:3]
[Card(rank='2', suit='spades'), Card(rank='3', suit='spades'),
Card(rank='4', suit='spades')]
>>> deck[12::13]
[Card(rank='A', suit='spades'), Card(rank='A', suit='diamonds'),
Card(rank='A', suit='clubs'), Card(rank='A', suit='hearts')]
Just by impl... | |
python_data_model/23210_72_0.txt | All reactions
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python_data_model/using-setattr-in-python2_47_0.txt | Share
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python_data_model/python_data_model_29_0.txt | ### 3.2.11. Class instances ¶
A class instance is created by calling a class object (see above). A class
instance has a namespace implemented as a dictionary which is the first place
in which attribute references are searched. When an attribute is not found
there, and the instanceâs class has an attribute by tha... | |
python_data_model/23210_37_0.txt | ##
samuelcolvin | |
python_data_model/23210_52_0.txt | Something went wrong.
Quote reply | |
python_data_model/23210_81_0.txt | mejrs
Apr 20, 2022 | |
python_data_model/python_data_model_42_0.txt | #### 3.2.13.6. Class method objects ¶
A class method object, like a static method object, is a wrapper around
another object that alters the way in which that object is retrieved from
classes and class instances. The behaviour of class method objects upon such
retrieval is described above, under âinstance metho... | |
python_data_model/23210_40_0.txt | I'm wondering if there is a cleaner and more performant way of getting access
to ` object.__setattr__ ` or a similar method? The ` setattr ` method
doesn't work as it doesn't bypass the setattr method on the class/instance in
question.
---
Beta Was this translation helpful? Give feedback.
1 You must be log... | |
python_data_model/python_data_model_38_0.txt | ##### 3.2.13.2.3. Frame object methods ¶
Frame objects support one method:
frame. clear ( ) ¶
This method clears all references to [ local variables
](executionmodel.html#naming) held by the frame. Also, if the frame belonged
to a [ generator ](../glossary.html#term-generator) , the generator is
fina... | |
python_data_model/python_data_model_45_0.txt | ### 3.3.2. Customizing attribute access ¶
The following methods can be defined to customize the meaning of attribute
access (use of, assignment to, or deletion of ` x.name ` ) for class
instances.
object. __getattr__ ( _ self _ , _ name _ ) ¶
Called when the default attribute access fails with an [... | |
python_data_model/The_import_system_9_0.txt | ## 5.9. References ¶
The import machinery has evolved considerably since Pythonâs early days. The
original [ specification for packages
](https://www.python.org/doc/essays/packages/) is still available to read,
although some details have changed since the writing of that document.
The original specification for... | |
python_data_model/23210_73_0.txt | *
# {{title}} | |
python_data_model/using-setattr-in-python2_39_0.txt | Mar 7, 2012 at 5:53
* 1 | |
python_data_model/The_import_system_7_0.txt | ## 5.7. Package Relative Imports ¶
Relative imports use leading dots. A single leading dot indicates a relative
import, starting with the current package. Two or more leading dots indicate a
relative import to the parent(s) of the current package, one level per dot
after the first. For example, given the following... | |
python_data_model/python_data_model_4_0.txt | ### 3.2.3. Ellipsis ¶
This type has a single value. There is a single object with this value. This
object is accessed through the literal ` ... ` or the built-in name `
Ellipsis ` . Its truth value is true.
| |
python_data_model/python_data_model_43_0.txt | ## 3.3. Special method names ¶
A class can implement certain operations that are invoked by special syntax
(such as arithmetic operations or subscripting and slicing) by defining
methods with special names. This is Pythonâs approach to _operator
overloading_ , allowing classes to define their own behavior with r... | |
python_data_model/python_data_model_34_0.txt | ##### 3.2.13.1.2. Methods on code objects ¶
codeobject. co_positions ( ) ¶
Returns an iterable over the source code positions of each [ bytecode
](../glossary.html#term-bytecode) instruction in the code object.
The iterator returns [ ` tuple ` ](../library/stdtypes.html#tuple "tuple") s
containing th... | |
python_data_model/python_data_model_11_0.txt | #### 3.2.5.2. Mutable sequences ¶
Mutable sequences can be changed after they are created. The subscription and
slicing notations can be used as the target of assignment and [ ` del `
](simple_stmts.html#del) (delete) statements.
Note
The [ ` collections ` ](../library/collections.html#module-collections
"coll... | |
python_data_model/using-setattr-in-python2_67_0.txt | answered Mar 5, 2012 at 3:14
Amber Amber | |
python_data_model/Chapter1_The_Python_Data_Model_4_2.txt | ’Reilly)
by Alex Martelli has excellent coverage of the data model. As I write this,
the most recent edition of the _Nutshell_ book is from 2006 and focuses on
Python 2.5, but there have been very few changes in the data model since then,
and Martelli’s description of the mechanics of attribute access is the most
autho... | |
python_data_model/23210_45_0.txt | ###
samuelcolvin | |
python_data_model/python_data_model_51_0.txt | #### 3.3.3.1. Metaclasses ¶
By default, classes are constructed using [ ` type() `
](../library/functions.html#type "type") . The class body is executed in a new
namespace and the class name is bound locally to the result of ` type(name,
bases, namespace) ` .
The class creation process can be customized by pas... | |
python_data_model/using-setattr-in-python2_55_0.txt | – Chris Morgan
Nov 5, 2014 at 20:53 | |
python_data_model/using-setattr-in-python2_117_0.txt | ##
Not the answer you're looking for? Browse other questions tagged | |
python_data_model/Chapter1_The_Python_Data_Model_11_0.txt | ## Don’t leave empty-handed
Get Mark Richards’s _Software Architecture Patterns_ ebook to better
understand how to design components—and how they should interact.
### It’s yours, free.
[ Get it now ](https://get.oreilly.com/ind_software-architecture-
patterns.html)
 ¶
A [ file object ](../glossary.html#term-file-object) represents an open file.
Various shortcuts are available to create file objects: the [ ` open() `
](../library/functions.html#open "open") built-in function, and also [ `
os.popen() ` ](../library/os.html... | |
python_data_model/using-setattr-in-python2_66_0.txt | Improve this answer
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python_data_model/python_data_model_13_0.txt | ### 3.2.7. Mappings ¶
These represent finite sets of objects indexed by arbitrary index sets. The
subscript notation ` a[k] ` selects the item indexed by ` k ` from the
mapping ` a ` ; this can be used in expressions and as the target of
assignments or [ ` del ` ](simple_stmts.html#del) statements. The built-i... | |
python_data_model/python_data_model_49_0.txt | #### 3.3.2.4. __slots__ ¶
___slots___ allow us to explicitly declare data members (like properties) and
deny the creation of [ ` __dict__ `
](../library/stdtypes.html#object.__dict__ "object.__dict__") and
___weakref___ (unless explicitly declared in ___slots___ or available in a
parent.)
The space saved over us... | |
python_data_model/Expressions_2_1.txt | may
not be physically located next to ` parent/two ` . In this case, Python will
create a namespace package for the top-level ` parent ` package whenever it
or one of its subpackages is imported.
See also [ **PEP 420** ](https://peps.python.org/pep-0420/) for the namespace
package specification.
| |
python_data_model/using-setattr-in-python2_45_0.txt | Highest score (default) Trending (recent votes count more) Date modified
(newest first) Date created (oldest first)
112 | |
python_data_model/python_data_model_32_0.txt | #### 3.2.13.1. Code objects ¶
Code objects represent _byte-compiled_ executable Python code, or [ bytecode
](../glossary.html#term-bytecode) . The difference between a code object and a
function object is that the function object contains an explicit reference to
the functionâs globals (the module in which it wa... | |
python_data_model/python_data_model_63_2.txt | ot-in) ) are normally implemented as an iteration
through a container. However, container objects can supply the following
special method with a more efficient implementation, which also does not
require the object be iterable.
object. __contains__ ( _ self _ , _ item _ ) ¶
Called to implement membership... | |
python_data_model/Simple_statements_14_0.txt | ## 7.14. The ` type ` statement ¶
**type_stmt** ::= 'type' [identifier](lexical_analysis.html#grammar-token-python-grammar-identifier) [[type_params](compound_stmts.html#grammar-token-python-grammar-type_params)] "=" [expression](expressions.html#grammar-token-python-grammar-expression)
The `... | |
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Add a comment | | |
python_data_model/Simple_statements_10_0.txt | ## 7.10. The ` continue ` statement ¶
**continue_stmt** ::= "continue"
` continue ` may only occur syntactically nested in a [ ` for `
](compound_stmts.html#for) or [ ` while ` ](compound_stmts.html#while) loop,
but not nested in a function or class definition within that loop. It
continue... | |
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python_data_model/The_import_system_0_1.txt | n a module is first imported, Python searches for the module and if found,
it creates a module object [ 1 ] , initializing it. If the named module
cannot be found, a [ ` ModuleNotFoundError `
](../library/exceptions.html#ModuleNotFoundError "ModuleNotFoundError") is
raised. Python implements various strategies to ... | |
python_data_model/using-setattr-in-python2_126_0.txt | 1
Setting class attributes using a loop inside constructor | |
python_data_model/23210_90_0.txt | Italic
Quote | |
python_data_model/using-setattr-in-python2_99_0.txt | if you want to be able to call upon ` setattr ` from within your class, you
could define a method for it.
def setAtrrClassInstance(self,name,value): #This returns None
setattr(self,name,value)
| |
python_data_model/python-setattr6_10_0.txt | * * *
Check out my new Python book Python One-Liners (Amazon Link). | |
python_data_model/using-setattr-in-python2_96_0.txt | The first thing that strikes me about your code is that you set start to the
value of ` setattr ` .
start = setattr(self, 'name', 'get_thing')
start = self.name
# Something wrong here?
value_returned = start() #I believe this == self.get_thing()
use_it(value_returned)
| |
python_data_model/python_data_model_44_1.txt | le.
Warning
Due to the precarious circumstances under which ` __del__() ` methods are
invoked, exceptions that occur during their execution are ignored, and a
warning is printed to ` sys.stderr ` instead. In particular:
* ` __del__() ` can be invoked when arbitrary code is being executed, including from any ar... | |
python_data_model/python_data_model_67_0.txt | ### 3.3.11. Emulating buffer types ¶
The [ buffer protocol ](../c-api/buffer.html#bufferobjects) provides a way
for Python objects to expose efficient access to a low-level memory array.
This protocol is implemented by builtin types such as [ ` bytes `
](../library/stdtypes.html#bytes "bytes") and [ ` memoryview... | |
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python_data_model/python-setattr6_17_0.txt | The difference is that the ` setattr() ` requires a string value of the
attribute name while the assignment operation requires the name of the
attribute itself. Thus, if you have only the textual representation of the
attribute to be set—for example, from a dictionary of key value pairs—you
should use the ` setattr() `... | |
python_data_model/Chapter1_The_Python_Data_Model_6_0.txt | ## [ Support ](https://www.oreilly.com/online-learning/support/)
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python_data_model/Chapter1_The_Python_Data_Model_4_1.txt | se operators | ` __invert__ ` ~, ` __lshift__ ` <<, ` __rshift__ ` >>, ` __and__ ` &, ` __or__ ` |, ` __xor__ ` ^
Reversed bitwise operators | ` __rlshift__ ` , ` __rrshift__ ` , ` __rand__ ` , ` __rxor__ ` , ` __ror__ `
Augmented assignment bitwise operators | ` __ilshift__ ` , ` __irshift__ ` , ` __iand__ ... | |
python_data_model/python_data_model_62_0.txt | ### 3.3.6. Emulating callable objects ¶
object. __call__ ( _ self _ [ , _ args... _ ] ) ¶
Called when the instance is âcalledâ as a function; if this method is
defined, ` x(arg1, arg2, ...) ` roughly translates to ` type(x).__call__(x,
arg1, ...) ` .
| |
python_data_model/Simple_statements_11_0.txt | ## 7.11. The ` import ` statement ¶
**import_stmt** ::= "import" module ["as" [identifier](lexical_analysis.html#grammar-token-python-grammar-identifier)] ("," module ["as" [identifier](lexical_analysis.html#grammar-token-python-grammar-identifier)])*
| "from" relative_modu... | |
python_data_model/Expressions_9_1.txt | 024, Python Software Foundation.
This page is licensed under the Python Software Foundation License Version 2.
Examples, recipes, and other code in the documentation are additionally
licensed under the Zero Clause BSD License.
See [ History and License ](/license.html) for more information.
The Python Softwa... | |
python_data_model/using-setattr-in-python2_35_0.txt | Mar 5, 2012 at 6:58
* 5 | |
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