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What is the dependency inversion principle and why is it important?
... should depend upon abstractions.
Abstractions should never depend upon details. Details should depend upon abstractions.
As to why it is important, in short: changes are risky, and by depending on a concept instead of on an implementation, you reduce the need for change at call sites.
Effectivel...
App Inventor 2 SQLite 拓展：超流行兼容主流SQL语法的迷你本地数据库引擎...
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How to avoid reinstalling packages when building Docker image for Python projects?
...for pytest
Installing py.test script to /usr/local/bin
Installing py.test-2.7 script to /usr/local/bin
Running setup.py install for py
Successfully installed pytest ipython py
Cleaning up...
---> 23a1af3df8ed
Removing intermediate container 4b7a85a64c33
Step 4 : ADD . /srv
---> d8ae270eca3...
Setting up a common nuget packages folder for all solutions when some projects are included in multi
...nd now have NuGet configured to use a shared Packages folder.
As of NuGet 2.7.1 (2.7.40906.75) with VStudio 2012
First off the thing to keep in mind is that nuget.config does not control all of the path settings in the nuget package system. This was particularly confusing to figure out. Specifical...
Benchmarking (python vs. c++ using BLAS) and (numpy)
....
To find out which BLAS Numpy is linked against, do:
$ python
Python 2.7.2+ (default, Aug 16 2011, 07:24:41)
[GCC 4.6.1] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import numpy.core._dotblas
>>> numpy.core._dotblas.__file__
'/usr/lib...
How efficient is locking an unlocked mutex? What is the cost of a mutex?
...ens often, then multiple locks would increase parallelism. At the cost of maintainability, since more locking means more debugging of the locking.
How efficient is it to lock a mutex? I.e. how much assembler instructions are there likely and how much time do they take (in the case that the mutex...
How to merge YAML arrays?
...ction below.
Context
This post assumes the following context:
python 2.7
python YAML parser
Problem
lfender6445 wishes to merge two or more lists within a YAML file, and have those
merged lists appear as one singular list when parsed.
Solution (Workaround)
This may be obtained simply by a...
MQTT物联网协议完全实践指南 · App Inventor 2 中文网
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Referring to the null object in Python
...ot even as a class attribute or in the confines of a function.
# In Python 2.7
>>> class SomeClass(object):
... def my_fnc(self):
... self.None = 'foo'
SyntaxError: cannot assign to None
>>> def my_fnc():
None = 'foo'
SyntaxError: cannot assign to None
# In...
What's the difference between utf8_general_ci and utf8_unicode_ci?
..., utf8 is a flawed UTF-8 implementation from early MySQL versions which remains only for backward compatibility. The fixed version was given the name utf8mb4.
Note: Newer versions of MySQL have updated Unicode sorting rules, available under names such as utf8mb4_0900_ai_ci for equivalent rules based...