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When to use single quotes, double quotes, and backticks in MySQL
...tifiers, but are only necessary when the identifier is a MySQL reserved keyword, or when the identifier contains whitespace characters or characters beyond a limited set (see below) It is often recommended to avoid using reserved keywords as column or table identifiers when possible, avoiding the qu...
Why is “throws Exception” necessary when calling a function?
...our program) but you must at first caller method inside the 'main'. in one word, there is 'throw', there must be 'catch/try', even if not same method where exception happens.
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Spring Java Config: how do you create a prototype-scoped @Bean with runtime arguments?
...d. It is invalid to use a non-null args value
in any other case.
In other words, for this prototype scoped bean, you are providing the arguments that will be used, not in the constructor of the bean class, but in the @Bean method invocation. (This method has very weak type guarantees since it uses ...
How do you tell someone they're writing bad code? [closed]
...ed to bad names: read about Stroop effect. Try reading the colors, not the words. Now think about how you name variables. If you don't find good names that actually describe what the variables are used for you will have a hard time reading and understanding your code when you come back to it later.
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Is MonoTouch now banned on the iPhone? [closed]
...ouncement.
Most people here simply want to take Apple's document by the word and say "yes, its banned". Well, here's my point of view: at this point, nobody really has any idea if MonoTouch is going to be banned or not, and I'll explain why:
The Apple agreement version 3 (not the latest, the one...
What's a correct and good way to implement __hash__()?
...th this solution is that the hash(A(a, b, c)) == hash((a, b, c)). In other words, the hash collides with that of the tuple of its key members. Maybe this does not matter very often in practice?
Update: the Python docs now recommend to use a tuple as in the example above. Note that the documentation...
What does the tilde before a function name mean in C#?
...at are true of destructors are true of finalizers, and vice versa, but the words mean slightly different things.
– supercat
Jan 16 '14 at 18:05
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Where to place and how to read configuration resource files in servlet based application?
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Word of warning: if you put config files in your WEB-INF/classes folder, and your IDE, say Eclipse, does a clean/rebuild, it will nuke your conf files unless they were in the Java source directory. BalusC's great answer allud...
add a string prefix to each value in a string column using Pandas
...use pandas.Series.map :
df['col'].map('str{}'.format)
It will apply the word "str" before all your values.
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Is a Python dictionary an example of a hash table?
... -4037225020714749784 if you're geeky enough to care. Continue in your own words, kids, and the hash is still a 19-digit number. I assume there is a limit on length of string you can hash in Python, but safe to say many more possible strings than possible values. And hash(False) = 0 by the way.
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