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使用App Inventor扩展实现多点触控：Scale Detector · App Inventor 2 中文网
...助”->“伴侣信息”以下载该伴侣。 当你切换回普通的AI2服务器时，你需要重新安装普通的伴侣。
你可以使用扩展测试服务器按照下面第 2 部分中的描述实施 ScaleDetector.aix 扩展。
请记住，扩展机制仍然不稳定并且正在开发...
How can I represent an infinite number in Python?
...d out, x is also infinity or "nan" ("not a number").
Additionally (Python 2.x ONLY), in a comparison to Ellipsis, float(inf) is lesser, e.g:
float('inf') < Ellipsis
would return true.
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How do I detect a click outside an element?
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Combining CSS Pseudo-elements, “:after” the “:last-child”
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edited Aug 11 '17 at 23:50
answered Feb 28 '10 at 16:14
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What does “Auto packing the repository for optimum performance” mean?
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answered Dec 26 '11 at 18:31
CascabelCascabel
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Is there a 'foreach' function in Python 3?
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edited Sep 12 '15 at 19:14
user 451
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How to switch position of two items in a Python list?
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i = ['title', 'email', 'password2', 'password1', 'first_name',
'last_name', 'next', 'newsletter']
a, b = i.index('password2'), i.index('password1')
i[b], i[a] = i[a], i[b]
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How to compare 2 files fast using .NET?
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edited May 23 '17 at 12:26
Community♦
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answered Aug 31 '09 at 17:41
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How can I delay a method call for 1 second?
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performSelector:withObject:afterDelay:
Document Reference
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