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How to secure MongoDB with username and password
...at starts with #auth=true in your mongod configuration file (default path /etc/mongo.conf). This will enable authentication for mongodb.
Then, restart mongodb : sudo service mongod restart
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How to get all subsets of a set? (powerset)
...sets).
def power_set(A):
"""A is an iterable (list, tuple, set, str, etc)
returns a set which is the power set of A."""
length = len(A)
l = [a for a in A]
ps = set()
for i in range(2 ** length):
selector = f'{i:0{length}b}'
subset = {l[j] for j, bit in enum...
How to make rounded percentages add up to 100%
...mal place instead of integer values. So the numbers would be 48.3 and 23.9 etc. This would drop the variance from 100 by a lot.
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What JSON library to use in Scala? [closed]
...ackson, not using Jerkson. It has support for Scala objects, (case classes etc).
Below is an example of how I use it.
object MyJacksonMapper extends JacksonMapper
val jsonString = MyJacksonMapper.serializeJson(myObject)
val myNewObject = MyJacksonMapper.deserializeJson[MyCaseClass](jsonString)
T...
What is :: (double colon) in Python when subscripting sequences?
...y see what is happening, you need to coerce the range to a list, np.array, etc.
– PikalaxALT
Sep 19 '14 at 0:54
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How to work with complex numbers in C?
...ed engineering domains such as physics, electronics, mechanics, astronomy, etc...
Real and imaginary part, of a negative square root example:
#include <stdio.h>
#include <complex.h>
int main()
{
int negNum;
printf("Calculate negative square roots:\n"
"Enter neg...
Is there a UIView resize event?
...do keep changing this stuff. Anyway, now you should use viewWillTransition etc. etc.
– Dan Rosenstark
Jan 12 '17 at 19:49
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CMake unable to determine linker language with C++
...your project supports.
Example languages are CXX (i.e. C++), C, Fortran, etc. By default C
and CXX are enabled. E.g. if you do not have a C++ compiler, you can
disable the check for it by explicitly listing the languages you want
to support, e.g. C. By using the special language "NONE" all c...
What do the terms “CPU bound” and “I/O bound” mean?
...cked by I/O, or input/output, such as reading or writing to disk, network, etc.
In general, when optimizing computer programs, one tries to seek out the bottleneck and eliminate it. Knowing that your program is CPU bound helps, so that one doesn't unnecessarily optimize something else.
[And by "b...
What are best practices that you use when writing Objective-C and Cocoa? [closed]
...nter-caps (CamelCase) in method names, parameters, variables, class names, etc. rather than underbars (underscores).
Class names start with an upper-case letter, variable and method names with lower-case.
Whatever else you do, don't use Win16/Win32-style Hungarian notation. Even Microsoft gave up...