python property class namespace confusion Question: I am confused about use of property class with regard to references to the fset/fget/fdel functions and in which namespaces they live. The behavior is different depending on whether I use property as a decorator or a helper function. Why do duplicate vars in class and instance namespaces impact …
Why async function binds name incorrectly from the outer scope? Question: Here is an async function generator by iterating a for loop. I expected this closure to respect the names from the outer scope. import asyncio coroutines = [] for param in (1, 3, 5, 7, 9): async def coro(): print(param ** 2) # await …
Django: referencing a namespace in a template during a unit test gives "not a registered namespace" error Question: I am just learning how to unit test so I’m sure I’m not understanding some core principal. I have custom 400 and 500 error handlers that return a template indicating the error to the user. Now, in …
Python package with optional namespace sub-packages Question: Problem I am struggling to create a single entry point for installing a python package that leverages namespace sub-package to allow users to optionally download additional modules. Below is the piece I am struggling with in this example. I have also provided additional context below as well to …
Concept of namespace, global, local with respect to import Question: I understand that below are the scoping levels in python (listed in highest to lowest order) Local(L): Defined inside function/class Enclosed(E): Defined inside enclosing functions(Nested function concept) Global(G): Defined at the uppermost level Built-in(B): Reserved names in Python builtin modules I understand this concept when …
How to tell if Python module is a namespace module Question: In Python 3, modules can be namespace modules without an __init__.py (as per PEP 420) or as a regular module (i.e. ‘[modules] packages as they are implemented in Python 3.2 and earlier’ – PEP 420) that have an __init__.py or are a single .py …
What does "Symbol not found / Expected in: flat namespace" actually mean? Question: When I import a module I built, I get this boost-python related error: Traceback (most recent call last): File “<string>”, line 1, in <module> ImportError: dlopen(./myMod.so, 2): Symbol not found: __ZN5boost6python7objects15function_objectERKNS1_11py_functionERKSt4pairIPKNS0_6detail7keywordES9_E Referenced from: ./myMod.so Expected in: flat namespace in ./myMod.so What does …
In a Python function, Is there a way to tell the argument's variable name on the caller side? Question: I am trying to create a logger function: def logger(someVariable): # some code that prints the name of someVariable So when I call the function: logger(myvarA) # should output the string ‘myvarA’ logger(someobj.varB) # should output …
Checking if variable exists in Namespace Question: I’m trying to use the output of my argparse (simple argparse with just 4 positional arguments that each kick of a function depending on the variable that is set to True) Namespace(battery=False, cache=True, health=False, hotspare=False) At the moment I’m trying to figure out how to best ask python …
Grouping constants in python Question: This is mainly a “good python style” question. I have a module which is using a number of constants that feels should be grouped. Lets say we have Dogs and cat and each of them have number of legs and favorite food. Note that we want to model nothing but …
