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How do I calculate the date six months from the current date using the datetime Python module?
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Well, that depends what you mean by 6 months from the current date.
Using natural months:
(day, month, year) = (day, (month + 5) % 12 + 1, year + (month + 5)/12)
Using a banker's definition, 6*30:
date += datetime.timedelta(6 * 30)
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What is the difference between 'protected' and 'protected internal'?
...h an
instance of the derived class type.
Note that: protected internal means "protected OR internal" (any class in the same assembly, or any derived class - even if it is in a different assembly).
...and for completeness:
private:
The type or member can be accessed only by code in the same...
Usages of Null / Nothing / Unit in Scala
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You only use Nothing if the method never returns (meaning it cannot complete normally by returning, it could throw an exception). Nothing is never instantiated and is there for the benefit of the type system (to quote James Iry: "The reason Scala has a bottom type is tied to...
Run a callback only if an attribute has changed in Rails
...eRecord::Base
before_save :do_something, if: :will_save_change_to_status_id?
private
def do_something
# ...
end
end
The commit that changed ActiveRecord::Dirty is here: https://github.com/rails/rails/commit/16ae3db5a5c6a08383b974ae6c96faac5b4a3c81
Here is a blog post on these change...
With MySQL, how can I generate a column containing the record index in a table?
... @smhnaji MySQL requires that every "derived table" is given a name. I decided to call it "r" :) ... It has little purpose in this case, but you'd normally use it to reference attributes of the derived table, as if it was a real table.
– Daniel Vassallo
Feb 27...
Debug.Assert vs Exception Throwing
...ive me to use Debug.Assert instead of throwing a plain exception. What I mean is, in .NET the default response to a failed assertion is to "stop the world" and display a message box to the user. Though this kind of behavior could be modified, I find it highly annoying and redundant
to do that, whi...
What's quicker and better to determine if an array key exists in PHP?
... sure array_key_exists() will only check if the key is in the array, which means it won't do a search since it's a hash table.
– Francesco Pasa
Apr 22 at 6:02
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Why use Abstract Base Classes in Python?
...ner is a degenerate case, that only includes \_\_contains\_\_, and only to mean the predefined convention. Using an ABC doesn't add much value by itself, I agree. I suspect it was added to allow (for e.g.) Set to inherit from it. By the time you get to Set, suddenly belonging to the the ABC has cons...
Pro JavaScript programmer interview questions (with answers) [closed]
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Good question. Small nitpick: I believe you mean "return result" instead of "return i". Pro-tip: Set up a nice little test environment to test code before posting ;-)
– MisterMister
Apr 8 '10 at 20:37
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convert ArrayList to JSONArray
...NArray(list);
References:
jsonarray constructor:
http://developer.android.com/reference/org/json/JSONArray.html#JSONArray%28java.util.Collection%29
collection:
http://developer.android.com/reference/java/util/Collection.html
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