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BLE协议—广播和扫描 - 创客硬件开发 - 清泛IT社区，为创新赋能！
...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=扫描间...
Get type of all variables
..., 6L)) #a vector containing only integers: integer
typeof(c(1.5, 2.5)) #a vector containing only doubles: double
typeof(c(1.5, 2.5)) #a vector containing only doubles: double
typeof(c(TRUE, FALSE)) #a vector containing only logicals: logical
#R is really cramping my...
How to write inline if statement for print?
...on: statement
if condition:
block
if expression (introduced in Python 2.5)
expression_if_true if condition else expression_if_false
And note, that both print a and b = a are statements. Only the a part is an expression. So if you write
print a if b else 0
it means
print (a if b else 0)
...
Check if a given key already exists in a dictionary and increment it
...
You are looking for collections.defaultdict (available for Python 2.5+). This
from collections import defaultdict
my_dict = defaultdict(int)
my_dict[key] += 1
will do what you want.
For regular Python dicts, if there is no value for a given key, you will not get None when accessing the...
How to copy a file to a remote server in Python using SCP or SSH?
...: subprocess.check_call(['scp', srcfile, dest]) could be used since Python 2.5 instead of rc = Popen(..).wait(); if rc != 0: raise ..
– jfs
Mar 28 '14 at 10:37
...
How to give border to any element using css without adding border-width to the whole width of elemen
... case can you fudge it by subtracting half the border from the padding? (-2.5 from the padding if your border is 5px wide, you can't have negative padding so to go smaller reduce the overall width of the box). You can add an extra 2.5px to the margin to keep the overall box the same size.
I rea...
Symfony2 : How to get form validation errors after binding the request to the form
...$string = var_export($this->getErrorMessages($form), true);
Symfony 2.5 / 3.0:
$string = (string) $form->getErrors(true, false);
Docs:
https://github.com/symfony/symfony/blob/master/UPGRADE-2.5.md#form
https://github.com/symfony/symfony/blob/master/UPGRADE-3.0.md#form (at the bottom: Th...
Installing a local module using npm?
...package.json:
"name": "mymodule",
"peerDependencies":
{
"foo": "^2.5"
}
/dev/myproject/package.json:
"dependencies":
{
"mymodule": "file:/local/mymodule",
"foo": "^2.5"
}
In this scenario, npm sets up myproject's node_modules/ like this:
/dev/myproject/node_modules/
f...
What is the 'dynamic' type in C# 4.0 used for?
... between decimal and double.
decimal foo = GetDecimalValue();
foo = foo / 2.5; // Does not compile
foo = Math.Sqrt(foo); // Does not compile
string bar = foo.ToString("c");
The second line does not compile because 2.5 is typed as a double and line 3 does not compile because Math.Sqrt expects a do...
Reading a huge .csv file
...iency when using this technique with csv.DictReader? Because my tests on a 2.5GB .csv file show that trying to iterate row by row like this when using that instead of csv.reader causes the Python process to grow to the full 2.5GB memory usage.
– user5359531
Jul...