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How to know what the 'errno' means?
...f("Oh dear, something went wrong with read()! %s\n", strerror(errno));
}
Linux also supports the explicitly-threadsafe variant strerror_r().
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Debugging Scala code with simple-build-tool (sbt) and IntelliJ
...'s a very convenient -jvm-debug flag in the official SBT packages for Mac, Linux & Windows. You can use the flag to specify the debug port:
sbt -jvm-debug 5005
Under the covers, this starts the JVM for SBT with the typical verbose debugging incantation:
-Xdebug -Xrunjdwp:transport=dt_socket,...
Numpy: Divide each row by a vector element
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Pythonic way to do this is ...
np.divide(data.T,vector).T
This takes care of reshaping and also the results are in floating point format.
In other answers results are in rounded integer format.
#NOTE: No of columns in bot...
Bypass confirmation prompt for pip uninstall
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starting with pip version 7.1.2 you can run pip uninstall -y <python package(s)>
pip uninstall -y package1 package2 package3
or from file
pip uninstall -y -r requirements.txt
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Are Exceptions in C++ really slow
...aware that Pyhon has a finally-clause for exception handling. this means a Python implementation either has stack unwinding or is not Python. you appear to be completely ignorant of the subjects that you make (fantasy) claims about. sorry.
– Cheers and hth. - Alf
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Meaning of @classmethod and @staticmethod for beginner? [duplicate]
...someone explain to me the meaning of @classmethod and @staticmethod in python? I need to know the difference and the meaning.
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how to iterate through dictionary in a dictionary in django template?
...ic dict.
To iterate over dict keys in a sorted order - First we sort in python then iterate & render in django template.
return render_to_response('some_page.html', {'data': sorted(data.items())})
In template file:
{% for key, value in data %}
<tr>
<td> Key: {{ key ...
What is a bus error?
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Another cause of bus errors (on Linux anyway) is when the operating system can't back a virtual page with physical memory (e.g. low-memory conditions or out of huge pages when using huge page memory.) Typically mmap (and malloc) just reserve the virtual add...
Algorithm to generate a crossword
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I just recently wrote my own in Python. You can find it here: http://bryanhelmig.com/python-crossword-puzzle-generator/. It doesn't create the dense NYT style crosswords, but the style of crosswords you might find in a child's puzzle book.
Unlike a few alg...
Algorithm to calculate the number of divisors of a given number
...ee how many of those primes act as a divisor (and how often).
Here's some python for the algo Look here and search for "Subject: math - need divisors algorithm". Just count the number of items in the list instead of returning them however.
Here's a Dr. Math that explains what exactly it is you nee...