Hadron | Presentation wrapper for deploying chatbots including TTS | Chat library
kandi X-RAY | Hadron Summary
kandi X-RAY | Hadron Summary
Part of the SEED token project. This is a sneak preview - there is more to come. See the Wiki for more information.
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QUESTION
I've been learning how to implement composition into my python programming, but I'm struggling to understand why it's preferred over inheritance.
For example, here is my code so far:
...ANSWER
Answered 2020-Mar-11 at 20:48Which you use depends on what relationship you're trying to model.
Composition isn't always the better option. "Composition over inheritance" is often repeated because inheritance is often abused with the idea that it reduces the amount of code that you need to write. That's entirely the wrong motivation to base your decision on though.
If you have two classes, A
and B
, a rough, general guide is:
- If
B
is anA
, you probably want inheritance. - If
B
has anA
, you probably want composition.
In your case here, from my extraordinarily limited knowledge of particle physics, a Hadron
is a Particle
, so inheritance is probably a better fit. A Hadron
doesn't contain/have a Particle
, so I think you're trying to work against the grain by forcing composition here.
QUESTION
We have an R library which has the dataset plaq.sample
in the file data/plaq.sample.Rdata
. One of the examples of a library function uses it. The example works just fine on my laptop (R 3.5.1), my colleagues laptop (R 3.1.3 and 3.4.4) but it fails on Travis CI (R 3.5.1 as well). The output is the following:
ANSWER
Answered 2018-Nov-13 at 15:38I read a warning about the hidden file .Rdata
which was present in the checking. I have added .Rdata
to the .Rbuildignore
file to exclude it. However, this file interprets each line as a regular expression, therefore also including data/plaq.sample.Rdata
. Removing this line makes the dataset available again.
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