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Append an object to a list in R in amortized constant time, O(1)?

... 2-element vector named c as is clearly intended! – j_random_hacker Dec 5 '11 at 16:45 7 So is th...
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Django ManyToMany filter()

... Just restating what Tomasz said. There are many examples of FOO__in=... style filters in the many-to-many and many-to-one tests. Here is syntax for your specific problem: users_in_1zone = User.objects.filter(zones__id=<id1>) # same thing but using in users_in_1zone = User.object...
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A python class that acts like dict

... class Mapping(dict): def __setitem__(self, key, item): self.__dict__[key] = item def __getitem__(self, key): return self.__dict__[key] def __repr__(self): return repr(self.__dict__) def __len__(self): re...
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What is the canonical way to check for errors using the CUDA runtime API?

...on and wrapper macro like this: #define gpuErrchk(ans) { gpuAssert((ans), __FILE__, __LINE__); } inline void gpuAssert(cudaError_t code, const char *file, int line, bool abort=true) { if (code != cudaSuccess) { fprintf(stderr,"GPUassert: %s %s %d\n", cudaGetErrorString(code), file, lin...
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CMake: Print out all accessible variables in a script

... Using the get_cmake_property function, the following loop will print out all CMake variables defined and their values: get_cmake_property(_variableNames VARIABLES) list (SORT _variableNames) foreach (_variableName ${_variableNames}) ...
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How to get current CPU and RAM usage in Python?

...#!/usr/bin/env python import psutil # gives a single float value psutil.cpu_percent() # gives an object with many fields psutil.virtual_memory() # you can convert that object to a dictionary dict(psutil.virtual_memory()._asdict()) # you can have the percentage of used RAM psutil.virtual_memory().pe...
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Abstract methods in Python [duplicate]

...mething along these lines, using ABC import abc class Shape(object): __metaclass__ = abc.ABCMeta @abc.abstractmethod def method_to_implement(self, input): """Method documentation""" return Also read this good tutorial: http://www.doughellmann.com/PyMOTW/abc/ You can...
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Change auto increment starting number?

In MySQL, I have a table, and I want to set the auto_increment value to 5 instead of 1 . Is this possible and what query statement does this? ...
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PHP “php://input” vs $_POST

I have been directed to use the method php://input instead of $_POST when interacting with Ajax requests from JQuery. What I do not understand is the benefits of using this vs the global method of $_POST or $_GET . ...
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理解Python的 with 语句 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术

...hat the statement after with has to evaluate an object that responds to an __enter__() as well as an __exit__() function. 这看起来充满魔法,但不仅仅是魔法,Python对with的处理还很聪明。基本思想是with所求值的对象必须有一个__enter__()方法,一个__exit__()...