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Checking whether a variable is an integer or not [duplicate]
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How can I determine whether a 2D Point is within a Polygon?
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Mathematical functions in Swift
...d also classes for user interface, it depends if your playground is for OS X or iOS.
For OS X, you need import Cocoa.
import Cocoa
For iOS, you need import UIKit.
import UIKit
You can easily discover your playground platform by opening File Inspector (⌥⌘1).
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Realistic usage of the C99 'restrict' keyword?
...he vector instructions.
Wikipedia has an entry on restrict, with another example, here.
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How do I grep for all non-ASCII characters?
I have several very large XML files and I'm trying to find the lines that contain non-ASCII characters. I've tried the following:
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“X-UA-Compatible” content=“IE=9; IE=8; IE=7; IE=EDGE”
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If you support IE, for versions of Internet Explorer 8 and above, this:
<meta http-equiv="X-UA-Compatible" content="IE=9; IE=8; IE=7" />
Forces the browser to render as that particular version's standards. It is not supported for IE7 and below.
If you separate...
clang: how to list supported target architectures?
...ch64. This is mainly for implementation convenience because the different execution modes have very different instruction encodings and semantics.
For each of the architectures listed, llc -march=ARCH -mattr=help will list "available CPUs" and "available features". The CPUs are generally just a conv...
How do you detect the clearing of a “search” HTML5 input?
In HTML5, the search input type appears with a little X on the right that will clear the textbox (at least in Chrome, maybe others). Is there a way to detect when this X is clicked in Javascript or jQuery other than, say, detecting when the box is clicked at all or doing some sort of location clic...
How to sort a dataframe by multiple column(s)
I want to sort a data.frame by multiple columns. For example, with the data.frame below I would like to sort by column z (descending) then by column b (ascending):
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Looping over a list in Python
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Try this,
x in mylist is better and more readable than x in mylist[:] and your len(x) should be equal to 3.
>>> mylist = [[1,2,3],[4,5,6,7],[8,9,10]]
>>> for x in mylist:
... if len(x)==3:
... print x
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