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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...
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...
... 教育 入门必读 中文教程 IoT专题 AI2拓展 ChatGPT接入 Aia Store 开通VIP 搜索 App Inventor 2 SQLite 拓展：超流...
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...
What is the correct answer for cout
...P0145R3 Refining Expression Evaluation Order for Idiomatic C++ for more details.
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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...
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...
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...
... 各版本对比 App上架指南 入门必读 IoT专题 AI2拓展 Aia Store 关于 关于我们 发布日志 服务条款 搜索 ...
In Python, how do I determine if an object is iterable?
...pproach:
from collections.abc import Iterable # drop `.abc` with Python 2.7 or lower
def iterable(obj):
return isinstance(obj, Iterable)
The above has been recommended already earlier, but the general consensus has been that using iter() would be better:
def iterable(obj):
try:
...
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...
Asking the user for input until they give a valid response
...ses the likelihood of bugs in your system. What if you want to backport to 2.7 by changing input to raw_input, but accidentally change only the first input above? It's a SyntaxError just waiting to happen.
Recursion Will Blow Your Stack
If you've just learned about recursion, you might be tempted ...