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Add column with number of days between dates in DataFrame pandas
I want to subtract dates in 'A' from dates in 'B' and add a new column with the difference.
4 Answers
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ZSH iterm2 increase number of lines history
...ing to change the number of recallable lines in the terminal - not the command history, the output history.
3 Answers
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Entity Framework .Remove() vs. .DeleteObject()
...EntityCollection.Remove(childEntity) marks the relationship between parent and childEntity as Deleted. If the childEntity itself is deleted from the database and what exactly happens when you call SaveChanges depends on the kind of relationship between the two:
If the relationship is optional, i.e...
Contains method for a slice
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Mostafa has already pointed out that such a method is trivial to write, and mkb gave you a hint to use the binary search from the sort package. But if you are going to do a lot of such contains checks, you might also consider using a map instead.
It's trivial to check if a specific map key exist...
Creating a copy of a database in PostgreSQL [closed]
What's the correct way to copy entire database (its structure and data) to a new one in pgAdmin?
20 Answers
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What's the difference between “Request Payload” vs “Form Data” as seen in Chrome dev tools Network t
...ta normally send by a POST or PUT Request.
It's the part after the headers and the CRLF of a HTTP Request.
A request with Content-Type: application/json may look like this:
POST /some-path HTTP/1.1
Content-Type: application/json
{ "foo" : "bar", "name" : "John" }
If you submit this per AJAX the...
What’s the best way to check if a file exists in C++? (cross platform)
... platform) , but I'm wondering if there is a better way to do this using standard c++ libs? Preferably without trying to open the file at all.
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How do I update devDependencies in NPM?
...he local modules, run
npm update --save-dev
Alternatively, the same command to save time
npm update -D
You can view the full detail of update, or any command for that matter through
npm help <cmd>
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How to detect if a property exists on an ExpandoObject?
... declaration shows it is implementing IDictionary:
public sealed class ExpandoObject : IDynamicMetaObjectProvider,
IDictionary<string, Object>, ICollection<KeyValuePair<string, Object>>,
IEnumerable<KeyValuePair<string, Object>>, IEnumerable, INotifyPropertyC...
Guid is all 0's (zeros)?
I'm testing out some WCF services that send objects with Guids back and forth. In my web app test code, I'm doing the following:
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