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Python: Check if one dictionary is a subset of another larger dictionary
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Convert to item pairs and check for containment.
all(item in superset.items() for item in subset.items())
Optimization is left as an exercise for the reader.
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What's the scope of the “using” declaration in C++?
I'm using the 'using' declaration in C++ to add std::string and std::vector to the local namespace (to save typing unnecessary 'std::'s).
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JavaScript null check
... @afsantos: in reality I don't think that many (any?) values will convert to null; however, it's a best practice to use strict comparison (===) unless you really know what you're doing and want comparison after conversion (==).
– maerics
May 21 '13 at ...
How to print to console when using Qt
...hat variables do you want to print? If you mean QStrings, those need to be converted to c-Strings. Try:
std::cout << myString.toAscii().data();
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quick random row selection in Postgres
... that contains couple of millions of rows. I have checked on the internet and I found the following
7 Answers
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Google Gson - deserialize list object? (generic type)
... hassle with the Type object, and if you really need a list you can always convert the array to a list by:
List<MyClass> mcList = Arrays.asList(mcArray);
IMHO this is much more readable.
And to make it be an actual list (that can be modified, see limitations of Arrays.asList()) then just d...
Preview an image before it is uploaded
...target.result);
}
reader.readAsDataURL(input.files[0]); // convert to base64 string
}
}
$("#imgInp").change(function() {
readURL(this);
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<form runat="server">
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Change text color based on brightness of the covered background area?
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If you are using ES6, convert hex to RGB then can use this:
const hexToRgb = hex => {
// turn hex val to RGB
const result = /^#?([a-f\d]{2})([a-f\d]{2})([a-f\d]{2})$/i.exec(hex)
return result
? {
r: parseInt(r...
Is there a predefined enumeration for Month in the .NET library?
... answered May 22 '09 at 19:27
Andy MikulaAndy Mikula
16.5k44 gold badges2727 silver badges3939 bronze badges
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How can a Java variable be different from itself?
...same with Double.NaN.
From JLS §15.21.1. Numerical Equality Operators == and !=:
Floating-point equality testing is performed in accordance with the rules of the IEEE 754 standard:
If either operand is NaN, then the result of == is false but the result of != is true.
Indeed, the test x!=x is tru...