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Use cases for the 'setdefault' dict method
...common use case: Grouping items (in unsorted data, else use itertools.groupby)
# really verbose
new = {}
for (key, value) in data:
if key in new:
new[key].append( value )
else:
new[key] = [value]
# easy with setdefault
new = {}
for (key, value) in data:
group = new.set...
How can I calculate the difference between two dates?
...ateFormatter.string(from: startDate)
startDate = Calendar.current.date(byAdding: .day, value: 1, to: startDate) ?? Date()
dateRange.append(stringDate)
}
print("Resulting Array - \(dateRange)")
Swift 3
var date1 = Date(string: "2010-01-01 00:00:00 +0000")
var date2 = Date(string: "2010-02...
Case insensitive 'Contains(string)'
...
This solution also needlessly pollutes the heap by allocating memory for what should be a searching function
– JaredPar
Mar 18 '13 at 16:09
17
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Configure apache to listen on port other than 80
...le is OK with: httpd.exe -n "YourServiceName" -t (replace the service name by the one you found on step 1);
Make sure that the service is stopped: httpd.exe -k stop -n "YourServiceName"
Start it with: httpd.exe -k start -n "YourServiceName"
If it starts alright, the problem is no longer there, but i...
Get name of object or class
...nav buttons, but I was able to find the variable name for the class itself by sweeping the variables defined in the parent window.
What I did was search for anything matching the 'instanceof' my class, and in case there might be more than one, I compared a specific property that was likely to be uni...
Convert a Scala list to a tuple?
...limited in their arity, the design of your software might be better served by a different solution.
Still, if you are creating a list statically, consider a solution like this one, also using shapeless. Here, we create an HList directly and the type is available at compile time. Remember that an HL...
Is it possible to use JS to open an HTML select to show its option list? [duplicate]
...n the options list is to have the select box clicked. Which I accomplished by invisibly overlaying the select on top of some target text.
– Phil
Sep 29 '09 at 15:24
...
Session variables in ASP.NET MVC
... What I noticed is that in a controller when I tried to access the session by doing the following, I kept on getting that error. This is due to the fact that this.HttpContext is part of the Controller object.
this.Session["blah"]
// or
this.HttpContext.Session["blah"]
However, what I wanted was ...
How can I avoid running ActiveRecord callbacks?
...)
#Rails >= v4.0 only
@person.update_columns(attributes)
http://api.rubyonrails.org/classes/ActiveRecord/Persistence.html#method-i-update_column
#2: Skipping callbacks that also works while creating an object
class Person < ActiveRecord::Base
attr_accessor :skip_some_callbacks
before_...
Should enums in C# have their own file? [closed]
... It adds noise to the directory when browsing, that's what I meant by wasteful.
– Finglas
Feb 17 '10 at 17:41
119
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