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QUESTION
I've started to create UI tests for my PyQt5 widgets using QtTest but have run into the following difficulties:
In order to speed up things, some of my widgets only perform operations when visible. As it seems that QtTest runs with invisible widgets, the corresponding tests fail.
For the same reason, I cannot test program logic that makes a subwidget visible under certain conditions.
Is there a way to make widgets visible during test? Is this good practice (e.g. w.r.t. CI test on GitHub) and is QtTest the way to go?
I have tried to use pytest with pytest-qt without success as I couldn't find a proper introduction or tutorial and I do know "Test PyQt GUIs with QTest and unittest".
Below you find a MWE consisting of a widget mwe_qt_widget.MyWidget
with a combobox, a pushbutton and a label that gets updated by the other two subwidgets:
ANSWER
Answered 2021-Jun-15 at 17:01The problem is simple: QWidgets are hidden by default so isVisible() will return false, the solution is to invoke the show() method in init() to make it visible:
QUESTION
I just reinstalled Fabric Samples v2.2.0 from Hyperledger Fabric repository according to the documentation.
But when I try to run asset-transfer-basic
application located in fabric-samples/asset-transfer-basic/application-javascript
directory by running node app.js
the wallet is created and an admin and user is registered. But then it tries to invoke the function as given in app.js
and shows this error
ANSWER
Answered 2021-Jan-29 at 04:04In my opinion, the CORE_VM_DOCKER_HOSTCONFIG_NETWORKMODE
setting seems to be wrong.
you can check docker-compose.yaml
or core.yaml
- I will explain fabric-samples/test-network as targeting according to your current situation.
- You can check in
CORE_VM_DOCKER_HOSTCONFIG_NETWORKMODE
in docker-compose.yaml - Perhaps in your case(fabric-samples/test-network), the value of
${COMPOSE_PROJECT_NAME}
was not set properly, so it was set to_test
. - Make sure the value is set correctly and change it to your network name.
QUESTION
I have been stuck on a module not found error of python3. I have a VM on Microsoft Azure, a Centos 7. Then I installed python3 and pip3, and some packages I needed. But there’s one package that I just couldn’t find after I installed it
sudo pip3 install --user stockstats
But whenever i wanted to run a python script using this package, there’s
ModuleNotFoundError: No module named 'stockstats'
What I tried:
pip3 show stockstats
As I really want to see where it was installed. It shows nothing. What it is supposed to do is like this:
...ANSWER
Answered 2021-Jun-13 at 07:23- You can visit This website for Installing pip in centos 7 Pip Install In Centos 7
for maybe some errors in installing pip.
reinstall python.
check that the module name is correctly typed
install stockstats in pip like "pip install stockstats" (getten from pypi.com)
Thank You
Security Coding.
QUESTION
Base.html
...ANSWER
Answered 2021-Jun-15 at 04:11Typo.
In the base.html, you've named the block "content". In index.html, you've called it "contend".
It would be nice if Django threw an error when this sort of thing happens - but I think the main reason it doesn't is for adaptability. At a glance it seem you're doing everything else correctly though.
QUESTION
The situation:
I am using React in the front-end and a Flask api server. I am wanting to send the data from React to the api and once I have done this I would like to use WTForms to run validations on the data before handling it. The question may seem similar to CSRF Protection with Flask/WTForms and React , but this does not answer the question, please take a look through I have put a lot of effort in writing a good question.
What I have
Currently the data is being sent successfully as a json object, where the keys match the names within the wtform structure, the aim is to get wtforms to take that json data and insert it into the object and and handle from there as normal
The JSON object being sent
...ANSWER
Answered 2021-Feb-01 at 14:53I found the answer too this.
In order to do this I ended up using the wtforms_json from json methodas below:
QUESTION
In the discord.py documention, there are Extensions: https://discordpy.readthedocs.io/en/stable/ext/commands/extensions.html and Cogs: https://discordpy.readthedocs.io/en/stable/ext/commands/cogs.html what is the difference?
...ANSWER
Answered 2021-Jun-13 at 17:28Extensions are files that are loaded, think of them as modules that the discord.py library imports when you call load_extension
. After the import happens, a setup
function is called, and is passed the Bot
instance that it was loaded into....essentially module.setup(bot)
. That is it, there is no more to extensions...typically this setup function calls add_cog
which will be described next, however there is no requirement that they do so.
A Cog is a class that inherits from commands.Cog
and is added to the bot's list of cogs through add_cog
, these classes typically house commands and act as a "category" for these commands. It can also house listeners for events such as on_message
or on_member_join
, etc.
TL;DR - Extensions are imported modules, cogs are classes
QUESTION
Why does calling fake.Provide()
wipe out fakes already configured with A.CallTo()
? Is this a bug?
I'm trying to understand a problem I've run into with Autofac.Extras.FakeItEasy (aka AutoFake). I have a partial solution, but I don't understand why my original code doesn't work. The original code is complicated, so I've spent some time simplifying it for the purposes of this question.
Why does this test fail? (working DotNetFiddle)
...ANSWER
Answered 2021-Jun-12 at 02:41It isn't that the Fake's configuration is being changed. In the first test, Resolve
is returning different Fakes each time it's called. (Check them for reference equality; I did.)
Provide
creates a new scope and pushes it on a stack. The topmost scope is used by Resolve
when it finds an object to return. I think this is why you're getting different Fakes in ACallTo_before_Provide
.
Is this a bug? Or is this the expected behavior? If this is the expected behavior, can someone explain why it works like this?
It's not clear to me. I'm not an Autofac user, and don't understand why an additional scope is introduced by Provide
. The stacked scope behaviour was introduced in PR 18. Perhaps the author can explain why.
In the meantime, if possible, I'd Provide
all you need to before Resolve
ing, if you can manage it.
QUESTION
I'm trying to get the Python package OSMnx running on my Windows10 machine. I'm still new to python so struggling with the basics. I've followed the instructions here https://osmnx.readthedocs.io/en/stable/ and have successfully created a new conda environment for it to run in. The installation seems to have gone ok. However, as soon as I try and import it, I get the following error
...ANSWER
Answered 2021-Apr-28 at 10:07The module fractions
is part of the Python standard library. There used to be a function gcd
, which, as the linked documentation says, is:
Deprecated since version 3.5: Use
math.gcd()
instead.
Since the function gcd
was removed from the module fractions
in Python 3.9, it seems that the question uses Python 3.9, not Python 3.7.6 as the question notes, because that Python version still had fractions.gcd
.
The error is raised by networkx
. Upgrading to the latest version of networkx
is expected to avoid this issue:
QUESTION
I am working in Cython, and I need to use Python's int
type, not C's int
type. How do I declare a Cython variable to be a Python-style integer?
cdef int x
will use a C-style integer, not a Python-style integer.
cdef object x
can store a Python-style integer, but it will be slow due to redundant runtime type checking.
If I know 100% that an object is going to be an int
, can I avoid the runtime type checks?
The Cython docs seem to indicate that declaring it as object
is the best that we can do, and we just have to live with the redundancy. This feels uncharacteristic of Cython, and I'm not fully convinced that I'm interpreting the documentation correctly.
Is is even possible to do what I'm asking?
...ANSWER
Answered 2021-Jun-11 at 17:50The docs are pretty clear (emphasis added):
The Python types
int
,long
, andfloat
are not available for static typing and instead interpreted as Cint
,long
, andfloat
respectively, as statically typing variables with these Python types has zero advantages.
There are a number of concrete C APIs associated with stuff like list
, tuple
, etc., where static typing provides a meaningful benefit, allowing Cython to save time by compiling code that works with them on a more intrusive level (directly accessing the underlying array for list
and tuple
for example). For Python 3's int
(and Python 2's long
), that advantage largely doesn't exist; at best Cython could skip a tiny amount of type-checking work, in exchange for needing to reproduce all the rest of the code involved in the operations without those prechecks (Python 2's int
is a C long
under the hood, so you may as well declare it as such and benefit from using the raw C value directly). And it's quite a lot of code, given the complexities of working with arbitrary precision integers, and entirely unnecessary. If your values are small enough, you can use them as C types, but for anything larger, the cost of specializing for them would be greater than the gains.
In short: Declare it as nothing, or object
if you want to be explicit. There's no benefit to be had from what you're trying to do, and you can't do it in any event.
QUESTION
We are struggling to model our data correctly for use in Kedro - we are using the recommended Raw\Int\Prm\Ft\Mst model but are struggling with some of the concepts....e.g.
- When is a dataset a feature rather than a primary dataset? The distinction seems vague...
- Is it OK for a primary dataset to consume data from another primary dataset?
- Is it good practice to build a feature dataset from the INT layer? or should it always pass through Primary?
I appreciate there are no hard & fast rules with data modelling but these are big modelling decisions & any guidance or best practice on Kedro modelling would be really helpful, I can find just one table defining the layers in the Kedro docs
If anyone can offer any further advice or blogs\docs talking about Kedro Data Modelling that would be awesome!
...ANSWER
Answered 2021-Jun-10 at 18:30Great question. As you say, there are no hard and fast rules here and opinions do vary, but let me share my perspective as a QB data scientist and kedro maintainer who has used the layering convention you referred to several times.
For a start, let me emphasise that there's absolutely no reason to stick to the data engineering convention suggested by kedro if it's not suitable for your needs. 99% of users don't change the folder structure in data
. This is not because the kedro default is the right structure for them but because they just don't think of changing it. You should absolutely add/remove/rename layers to suit yourself. The most important thing is to choose a set of layers (or even a non-layered structure) that works for your project rather than trying to shoehorn your datasets to fit the kedro default suggestion.
Now, assuming you are following kedro's suggested structure - onto your questions:
When is a dataset a feature rather than a primary dataset? The distinction seems vague...
In the case of simple features, a feature dataset can be very similar to a primary one. The distinction is maybe clearest if you think about more complex features, e.g. formed by aggregating over time windows. A primary dataset would have a column that gives a cleaned version of the original data, but without doing any complex calculations on it, just simple transformations. Say the raw data is the colour of all cars driving past your house over a week. By the time the data is in primary, it will be clean (e.g. correcting "rde" to "red", maybe mapping "crimson" and "red" to the same colour). Between primary and the feature layer, we will have done some less trivial calculations on it, e.g. to find one-hot encoded most common car colour each day.
Is it OK for a primary dataset to consume data from another primary dataset?
In my opinion, yes. This might be necessary if you want to join multiple primary tables together. In general if you are building complex pipelines it will become very difficult if you don't allow this. e.g. in the feature layer I might want to form a dataset containing composite_feature = feature_1 * feature_2
from the two inputs feature_1
and feature_2
. There's no way of doing this without having multiple sub-layers within the feature layer.
However, something that is generally worth avoiding is a node that consumes data from many different layers. e.g. a node that takes in one dataset from the feature layer and one from the intermediate layer. This seems a bit strange (why has the latter dataset not passed through the feature layer?).
Is it good practice to build a feature dataset from the INT layer? or should it always pass through Primary?
Building features from the intermediate layer isn't unheard of, but it seems a bit weird. The primary layer is typically an important one which forms the basis for all feature engineering. If your data is in a shape that you can build features then that means it's probably primary layer already. In this case, maybe you don't need an intermediate layer.
The above points might be summarised by the following rules (which should no doubt be broken when required):
- The input datasets for a node in layer
L
should all be in the same layer, which can be eitherL
orL-1
- The output datasets for a node in layer
L
should all be in the same layerL
, which can be eitherL
orL+1
If anyone can offer any further advice or blogs\docs talking about Kedro Data Modelling that would be awesome!
I'm also interested in seeing what others think here! One possibly useful thing to note is that kedro was inspired by cookiecutter data science, and the kedro layer structure is an extended version of what's suggested there. Maybe other projects have taken this directory structure and adapted it in different ways.
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