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Adding new column to existing DataFrame in Python pandas
...atch out with df.assign that your column is not called self. It will cause errors. This makes df.assign smelly, since there are these kind of artifacts in the function.
df.assign(self=pd.Series(['no', 'no', 'no', 'yes'])
TypeError: assign() got multiple values for keyword argument 'self'
You may ...
Null vs. False vs. 0 in PHP
...ng on and how to check if the returned value is what is wanted or did some error occur while processing. The same actually goes for function params, you can process them differently depending on if they are arrays or strings or what not, and this technique is used throughout PHP heavily too, so ever...
When should I use std::thread::detach?
... release the resources needed to be able to implement join.
It is a fatal error if a thread object ends its life and neither join nor detach has been called; in this case terminate is invoked.
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Spinlock versus Semaphore
...so (at least on Linux) the spin_trylock, which returns immediately with an error code, if the lock could not be acquired. A spin‑lock is not always that harsh. But using spin_trylock requires, for an application, to be properly designed that way (probably a queue of pending operations, and here, s...
Using varchar(MAX) vs TEXT on SQL Server
...nto @table values ('d')
select *
from @table
where a ='a'
This give an error:
The data types text and varchar are incompatible in the equal to operator.
Wheras this does not:
declare @table table (a varchar(max))
Interestingly, LIKE still works, i.e.
where a like '%a%'
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Java code To convert byte to Hexadecimal
...mples you will find on the internet. Hopefully I didn't make any egregious errors, but suggestions and corrections are highly welcome!
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Why does git-rebase give me merge conflicts when all I'm doing is squashing commits?
... over 400 commits, the first couple dozen of which were a lot of trial-and-error. We want to clean up these commits by squashing many down into a single commit. Naturally, git-rebase seems the way to go. My problem is that it ends up with merge conflicts, and these conflicts are not easy to resolve....
ASP.Net MVC Html.HiddenFor with wrong value
...rd that shows different parts of a larger model at every step.
Data and/or Errors from "Step 1" would become mixed up with "Step 2", etc, until I finally realized that ModelState was to 'blame'.
This was my simple solution:
if (oldPageIndex != newPageIndex)
{
ModelState.Clear(); // <-- sol...
How do I use WPF bindings with RelativeSource?
...dwardM. When I omit FindAncestor, before AncestorType, I get the following error: "RelativeSource is not in FindAncestor mode". (In VS2013, Community version)
– kmote
Apr 10 '17 at 3:40
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What's the difference between “declare class” and “interface” in TypeScript
... class that should have been an interface, you are going to have a runtime error because that generated code will be referring to an object with no runtime manifestation.
Conversely, if you simply implement an interface that should have been a declare class, you're going to have to re-implement all...