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BLE协议—广播和扫描 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...的时间。范围是4 ~ 16384单位是0.625ms，所以实际的时间是2.5ms ~10.24s。
扫描间隔（scan interval）：一次扫描窗口开始，到下一次扫描窗口开始的时间。范围是4 ~ 16384单位是0.625ms，所以实际的时间是2.5ms ~10.24s。
如果扫描窗口=...
Dictionary vs Object - which is more efficient and why?
...r i in range(1000000):
all[i] = Obj(i, [])
Run benchmark (using CPython 2.5):
$ lshw | grep product | head -n 1
product: Intel(R) Pentium(R) M processor 1.60GHz
$ python --version
Python 2.5
$ time python test_obj.py && time python test_dict.py && time python test_slots....
Read only the first line of a file?
...he file again when the block ends.
The with statement only works in Python 2.5 and up, and in Python 2.5 you need to use from __future__ import with_statement
In Python 3 you should specify the file encoding for the file you open. Read more...
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Multiple working directories with Git?
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Git 2.5 proposes since July 2015 a replacement for contrib/workdir/git-new-workdir: git worktree
See commit 68a2e6a by Junio C Hamano (gitster).
The release note mentions:
A replacement for contrib/workdir/git-new-workdir that d...
Include all existing fields and add new fields to document
...ddFields is new in MongoDB 3.4 which is supported by the C# driver version 2.5+
– styvane
Jul 17 '18 at 0:59
I have be...
Which version of Python do I have installed?
...dline.html#generic-options
--version may also work (introduced in version 2.5)
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Recommended add-ons/plugins for Microsoft Visual Studio [closed]
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I only saw performance going down with file over 2.5k lines. Otherwise it's fine... and 2.5k line is too much so it's a "features" that tell me that it must be in multiple file ;)
– Patrick Desjardins
Dec 9 '08 at 18:08
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What's the function like sum() but for multiplication? product()?
...ms:
>>> from math import log, exp
>>> data = [1.2, 1.5, 2.5, 0.9, 14.2, 3.8]
>>> exp(sum(map(log, data)))
218.53799999999993
>>> 1.2 * 1.5 * 2.5 * 0.9 * 14.2 * 3.8
218.53799999999998
Note, the use of log() requires that all the inputs are positive.
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How to embed small icon in UILabel
...tachment.image = leftIcon
leftAttachment.bounds = CGRect(x: 0, y: -2.5, width: 20, height: 20)
if let leftIcon = leftIcon {
leftAttachment.bounds = CGRect(x: 0, y: -2.5, width: leftIcon.size.width, height: leftIcon.size.height)
}
let leftAttachmentStr = NS...
MyISAM versus InnoDB [closed]
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Close to 200? If his average transaction makes 2.5 queries, that's [(2.5*1M)/3600s =] closer to 700.
– Ozzy
Apr 17 '12 at 13:40
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