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Regular vs Context Free Grammars
...ying for my computing languages test, and there's one idea I'm having problems wrapping my head around.
8 Answers
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SQL Inner-join with 3 tables?
I'm trying to join 3 tables in a view; here is the situation:
12 Answers
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How to effectively work with multiple files in Vim
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Why not use tabs (introduced in Vim 7)?
You can switch between tabs with :tabn and :tabp,
With :tabe <filepath> you can add a new tab; and with a regular :q or :wq you close a tab.
If you map :tabn and :tabp to your F7/F8 keys you ca...
What are some (concrete) use-cases for metaclasses?
...e a class that handles non-interactive plotting, as a frontend to Matplotlib. However, on occasion one wants to do interactive plotting. With only a couple functions I found that I was able to increment the figure count, call draw manually, etc, but I needed to do these before and after every plot...
if else in a list comprehension [duplicate]
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tscizzle
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answered Dec 10 '10 at 6:48
user225312user225312
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Convert RGB to RGBA over white
I have a hex color, e.g. #F4F8FB (or rgb(244, 248, 251) ) that I want converted into an as-transparent-as-possible rgba color (when displayed over white). Make sense? I'm looking for an algorithm, or at least idea of an algorithm for how to do so.
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How to escape a JSON string containing newline characters using JavaScript?
...m a JSON string in which a value is having new line character. This has to be escaped and then posted using AJAX call. Can any one suggest a way to escape the string with JavaScript. I am not using jQuery.
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what is the difference between ?:, ?! and ?= in regex?
I searched for the meaning of these expressions but couldn't understand the exact difference between them.
This is what they say:
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How to use enums as flags in C++?
Treating enum s as flags works nicely in C# via the [Flags] attribute, but what's the best way to do this in C++?
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Ignore python multiple return value
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One common convention is to use a "_" as a variable name for the elements of the tuple you wish to ignore. For instance:
def f():
return 1, 2, 3
_, _, x = f()
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