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App Inventor 2 蓝牙遥控教程 - 经典蓝牙与BLE控制智能硬件 · App Inventor 2 中文网
... 7.3 常见问题与解决
问题 1：Error 908 ACCESS_FINE_LOCATION
问题 2：Android 12+ 扫描不到设备
问题 3：JDY-34 双模蓝牙模块连接问题
八、进阶技巧
8.1 使用滑动条控制速度
8.2 ...
What do I use for a max-heap implementation in Python?
...y heapq, and that there is no good alternative.
– ire_and_curses
Jun 10 '10 at 17:46
24
@gatoatig...
Representing graphs (data structure) in Python
... both ways). We'll handle that by adding a directed parameter to the Graph.__init__ method. We'll also add some other helpful methods.
import pprint
from collections import defaultdict
class Graph(object):
""" Graph data structure, undirected by default. """
def __init__(self, connection...
Convert nested Python dict to object?
...']
The alternative (original answer contents) is:
class Struct:
def __init__(self, **entries):
self.__dict__.update(entries)
Then, you can use:
>>> args = {'a': 1, 'b': 2}
>>> s = Struct(**args)
>>> s
<__main__.Struct instance at 0x01D6A738>
>>...
How do I test an AngularJS service with Jasmine?
...hat passed
// for logging? Let's make it String-readable...
function _parseStuffIntoMessage(stuff) {
var message = "";
if (typeof stuff !== "string") {
message = JSON.stringify(stuff)
} else {
message = stuff;
}
return message;
}
/**
* @summary
* Wri...
How do I check for C++11 support?
...
There is a constant named __cplusplus that C++ compilers should set to the version of the C++ standard supported see this
#if __cplusplus <= 199711L
#error This library needs at least a C++11 compliant compiler
#endif
It is set to 199711L in V...
Removing multiple keys from a dictionary safely
...
Why not like this:
entries = ('a', 'b', 'c')
the_dict = {'b': 'foo'}
def entries_to_remove(entries, the_dict):
for key in entries:
if key in the_dict:
del the_dict[key]
A more compact version was provided by mattbornski using dict.pop()
...
Does C have a “foreach” loop construct?
...ave a foreach, but macros are frequently used to emulate that:
#define for_each_item(item, list) \
for(T * item = list->head; item != NULL; item = item->next)
And can be used like
for_each_item(i, processes) {
i->wakeup();
}
Iteration over an array is also possible:
#define f...
Among $_REQUEST, $_GET and $_POST which one is the fastest?
...
$_REQUEST, by default, contains the contents of $_GET, $_POST and $_COOKIE.
But it's only a default, which depends on variables_order ; and not sure you want to work with cookies.
If I had to choose, I would probably not us...
How to get a function name as a string?
...
my_function.__name__
Using __name__ is the preferred method as it applies uniformly. Unlike func_name, it works on built-in functions as well:
>>> import time
>>> time.time.func_name
Traceback (most recent ...