getattr Questions
1
I am curious if there is a way in Python 3 to type hint the return type of __getattr__() method in Python.
I have the following dummy code I was using for test purposes:
class MyClass:
def __geta...
Freeze asked 30/5, 2022 at 13:56
9
Solved
How can implement the equivalent of a __getattr__ on a class, on a module?
Example
When calling a function that does not exist in a module's statically defined attributes, I wish to create an ins...
Entopic asked 15/3, 2010 at 13:20
15
Solved
I read an article about the getattr function, but I still can't understand what it's for.
The only thing I understand about getattr() is that getattr(li, "pop") is the same as calling li....
Cyprio asked 2/11, 2010 at 5:45
2
Solved
Consider the following code example (python 2.7):
class Parent:
def __init__(self, child):
self.child = child
def __getattr__(self, attr):
print("Calling __getattr__: "+attr)
if hasattr(self...
Daystar asked 8/12, 2012 at 10:12
3
Solved
I have a problem with AttributeErrors raised in a @property in combination with __getattr__() in python:
Example code:
>>> def deeply_nested_factory_fn():
... a = 2
... return a.invalid_...
Christmastide asked 12/4, 2016 at 13:39
2
Solved
I have a model Project and i am getting the attributes of that with the following instr
attr = getattr(project, 'id', None)
project is the instance, id is the field and None is the default retur...
Wivern asked 27/11, 2013 at 6:54
4
Solved
Consider this code:
class Foo1(dict):
def __getattr__(self, key): return self[key]
def __setattr__(self, key, value): self[key] = value
class Foo2(dict):
__getattr__ = dict.__getitem__
__seta...
3
Solved
class A:
__slots__ = ("a",)
def __init__(self) -> None:
self.a = 1
class B1:
__slots__ = ("b",)
def __init__(self, b) -> None:
self.b = b
def __getattr__(self, k)...
Metagalaxy asked 10/8, 2020 at 10:44
5
Solved
I have an object with nested attributes like so:
obj:
attr_1:
attr_2
When both attr_1 and attr_2 exists, I can get it like so:
obj.attr_1.attr_2
But what if I'm not sure if either attribute exi...
Inbred asked 5/3, 2017 at 8:34
3
I have a problem in python.
I have a class whis custom __getattr__
class ChoiceNumToName(object):
def __init__(self, django_choice_tuple):
self.ods_choice_tuple = django_choice_tuple
self.choi...
3
Solved
I want to call some unknown function with adding parameters using getattr function. Is it possible?
3
Solved
Is there any way to determine the difference between a method and an attribute call using __getattr__?
I.e. in:
class Bar(object):
def __getattr__(self, name):
if THIS_IS_A_METHOD_CALL:
# Hand...
8
Solved
I am trying to understand when to define __getattr__ or __getattribute__. The python documentation mentions __getattribute__ applies to new-style classes. What are new-style classes?
Molliemollify asked 19/7, 2010 at 2:11
1
Solved
I am trying to understand a piece of Python code.
First, I have the following file structure:
folder1--
model
__init__.py
file1.py
file2.py
__init__.py
The __init__.py in the folder folder1 h...
5
Solved
I want to define a class containing read and write methods, which can be called as follows:
instance.read
instance.write
instance.device.read
instance.device.write
To not use interlaced classes, m...
Dooley asked 10/6, 2013 at 8:53
3
Solved
I'm using getattr to call different functions depending on a variable.
Im doing something like that:
getattr(foo, bar) ()
That works, calling functions like foo.bar()
My problem is that I have...
Becnel asked 2/8, 2012 at 15:51
4
Solved
I am trying to understand the difference between __getattr__ and __getattribute__, however, I am failing at it.
The answer to the Stack Overflow question Difference between __getattr__ vs __getatt...
Transpire asked 28/11, 2010 at 6:23
5
Solved
I have a class like:
class MyClass:
Foo = 1
Bar = 2
Whenever MyClass.Foo or MyClass.Bar is invoked, I need a custom method to be invoked before the value is returned. Is it possible in Python?...
Flite asked 1/7, 2010 at 6:9
1
Solved
How can I modify the classes below to make them pickeable?
This question: How to make a class which has __getattr__ properly pickable? is similar but refer to wrong exception in the use of getatt...
Speller asked 20/3, 2018 at 9:15
4
Solved
What do I pass as the first parameter "object" to the function setattr(object, name, value), to set variables on the current module?
For example:
setattr(object, "SOME_CONSTANT", 42);
giving th...
Navarra asked 29/5, 2010 at 2:7
3
Solved
I would like to make bool binary operations using the magic methods for these operators. For example, I can get a < b as getattr(a, '__lt__')(b) or a == b as getattr(a, '__eq__')(b).
Can I get...
Fruit asked 5/12, 2016 at 18:17
1
Solved
I read a bit on Python's object attribute lookup:
Seems pretty straight forward, so I tried it out (python3):
class A:
def __getattr__(self, attr):
return (1,2,3)
a = A()
a.foobar #returns (1,2...
Latoyialatreece asked 19/8, 2016 at 16:35
1
Solved
I dont know if this is something an expected behavior of getattr built_in method.
getattr executes the default(3rd) argument as well even if the actual argument(2nd) satisfies the condition.
Exampl...
Saxen asked 26/7, 2016 at 12:23
1
Solved
I have the following class:
class MyInt:
def __init__(self, v):
if type(v) != int:
raise ValueError('value must be an int')
self.v = v
def __getattr__(self, attr):
return getattr(self.v, at...
Cornea asked 10/7, 2016 at 17:59
2
Solved
Given the following class (with a buggy property) then what is the best foolproof way of checking that the bar property exists?
class Foo(object):
@property
def bar(self):
raise AttributeError(...
Reflexion asked 19/5, 2016 at 8:0
1 Next >
© 2022 - 2024 — McMap. All rights reserved.