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Explaining Python's '__enter__' and '__exit__'
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If you know what context managers are then you need nothing more to understand __enter__ and __exit__ magic methods. Lets see a very simple example.
In this example I am opening myfile.txt with help of open function. The try/finally...
Show Youtube video source into HTML5 video tag?
...6616c"></video>
Note there seems to some expire stuff. I don't know how long the src string will work.
Still testing myself.
Edit (July 28, 2011): Note that this video src is specific to the browser you use to retrieve the page source. I think Youtube generates this HTML dynamically (a...
How can I get Maven to stop attempting to check for updates for artifacts from a certain group from
...one of repositories. Downloads were hanging even with update police never. Now snapshots aren't downloaded which is exactly that I wanted.
– wolfroma
Aug 24 '17 at 19:16
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Red black tree over avl tree
... balance factor at each node. This takes O(N) extra space. However, if we know that the keys that will be inserted in the tree will always be greater than zero, we can use the sign bit of the keys to store the colour information of a red-black tree. Thus, in such cases red-black tree takes no extra ...
How do I clone a subdirectory only of a Git repository?
...ut doesn't check them out. Then do:
git config core.sparseCheckout true
Now you need to define which files/folders you want to actually check out. This is done by listing them in .git/info/sparse-checkout, eg:
echo "some/dir/" >> .git/info/sparse-checkout
echo "another/sub/tree" >> ....
Understanding events and event handlers in C#
...say these methods have the same signature, or shape, as the delegate.
So knowing how to create a reference to a method, let's think about the purpose of events: we want to cause some code to be executed when something happens elsewhere in the system - or "handle the event". To do this, we create sp...
Proper way to declare custom exceptions in modern Python?
...it needs
super(ValidationError, self).__init__(message)
# Now for your custom code...
self.errors = errors
That way you could pass dict of error messages to the second param, and get to it later with e.errors
Python 3 Update: In Python 3+, you can use this slightly more...
Delete branches in Bitbucket
...es. Those branches are for testing before it will be pulled to the master. Now I see lots of them on the list and they we will never use it again. How to delete those branches directly to Bitbucket?
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What does void mean in C, C++, and C#?
...hing
Generic data pointer: void* data
-- 'data' is a pointer to data of unknown type, and cannot be dereferenced
Note: the void in a function argument is optional in C++, so int myFunc() is exactly the same as int myFunc(void), and it is left out completely in C#. It is always required for a retur...
How to write to a file in Scala?
...ite
file.writeStrings( "It costs" :: "one" :: "dollar" :: Nil)
// Now all options
file.writeStrings("It costs" :: "one" :: "dollar" :: Nil,
separator="||\n||")(codec = Codec.UTF8)
}
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