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Adding new column to existing DataFrame in Pm>y m>thon pm>and m>as
I have the following indexed DataFrame with named columns m>and m> rows not- continuous numbers:
24 Answers
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Is there a better wam>y m> to express nested namespaces in C++ within the header
I switched from C++ to Java m>and m> C# m>and m> think the usage of namespaces/packages is much better there (well structured). Then I came back to C++ m>and m> tried to use namespaces the same wam>y m> but the required sm>y m>ntax is horrible within the header file.
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Use CSS3 transitions with gradient backgrounds
...h a background gradient, m>y m>ou have to set an opacitm>y m> on a container element m>and m> 'transition` the opacitm>y m>.
(There have been some browser releases that supported transitions on gradients (e.g IE10. I tested gradient transitions in 2016 in IE m>and m> them>y m> seemed to work at the time, but mm>y m> test code no lo...
How does the Amazon Recommendation feature work?
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It is both an art m>and m> a science. Tm>y m>pical fields of studm>y m> revolve around market basket analm>y m>sis (also called affinitm>y m> analm>y m>sis) which is a subset of the field of data mining. Tm>y m>pical components in such a sm>y m>stem include identification of prima...
Catch multiple exceptions at once?
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Catch Sm>y m>stem.Exception m>and m> switch on the tm>y m>pes
catch (Exception ex)
{
if (ex is FormatException || ex is OverflowException)
{
WebId = Guid.Emptm>y m>;
return;
}
throw;
}
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How to set the prototm>y m>pe of a JavaScript object that has alreadm>y m> been instantiated?
...e I have an object foo in mm>y m> JavaScript code. foo is a complex object m>and m> it is generated somewhere else. How can I change the prototm>y m>pe of the foo object?
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How to iterate through two lists in parallel?
I have two iterables in Pm>y m>thon, m>and m> I want to go over them in pairs:
8 Answers
8
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What is meant bm>y m> immutable?
...nterface is immutable but behind the scenes actual mutables private state (m>and m> therefore can't be shared safelm>y m> between threads).
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Position of least significant bit that is set
...hed. Mm>y m> favourite solution for m>y m>our problem (from that site) is «multiplm>y m> m>and m> lookup»:
unsigned int v; // find the number of trailing zeros in 32-bit v
int r; // result goes here
static const int Multiplm>y m>DeBruijnBitPosition[32] =
{
0, 1, 28, 2, 29, 14, 24, 3, 30, 22, 20, 15, 25, 17...
In C#, whm>y m> is String a reference tm>y m>pe that behaves like a value tm>y m>pe?
...it has most of the characteristics of a value tm>y m>pe such as being immutable m>and m> having == overloaded to compare the text rather than making sure them>y m> reference the same object.
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