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How to access pandas groupby dataframe by key
...y dictionary / copy of every subdataframe for every group, so will be much more memory-efficient that creating the naive dictionary with dict(iter(gb)). This is because it uses data-structures already available in the groupby object.
You can select different columns using the groupby slicing:
In...
Dynamic array in C#
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Sometimes plain arrays are preferred to Generic Lists, since they are more convenient (Better performance for costly computation -Numerical Algebra Applications for example, or for exchanging Data with Statistics software like R or Matlab)
In this case you may use the ToArray() method after i...
Remove Elements from a HashSet while Iterating [duplicate]
...de. See Becks book "Test Driven Development" or Fowler's "Refactoring" for more about factoring code.
– nash
Nov 4 '09 at 16:05
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How to put a line comment for a multi-line command [duplicate]
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JavaScript :How to set a Conditional Break Point in Chrome debugger tools
...s met and if it is the debugger breaks on this line. This behavior is much more useful since you don't have to play detective to find out when a variable does something unexpected.
– ejectamenta
Jan 11 '18 at 16:36
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Convert .pfx to .cer
...t serialized certificate store (.sst) file format which can contain one or more certificates. This is the default value for multiple certificates.
-- CERT: A .cer file format which contains a single DER-encoded certificate. This is the default value for one certificate.
-- P7B: A PKCS#7 ...
Is “IF” expensive?
...urns, break and continue statements, the infamous goto statement, and many more (these lists are far from exhaustive).
The branch target is another important issue. Most branches have a fixed branch target - they go to a specific location in code that is fixed at compile time. This includes if st...
Opening Vim help in a vertical split window
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To improve more: you can use cabbrev to redefine h as vert h: :cabbrev h vert h. Then every time you type :h, it will automatically expand to :vert h.
– Aaron Shen
Oct 18 '15 at 2:39
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How to create own dynamic type or dynamic object in C#?
...t;
{
return 55;
});
Console.WriteLine(MyDynamic.MyMethod());
Read more about ExpandoObject class and for more samples: Represents an object whose members can be dynamically added and removed at run time.
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What is CMake equivalent of 'configure --prefix=DIR && make all install '?
...ng, but setting PATH, FILEPATH, STRING, BOOL etc help the GUI to present a more appropriate widget.
– Marcus D. Hanwell
May 22 '13 at 16:54
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