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手机串口调试助手：USB OTG 收发文本与十六进制、定时发送（附 .aia 源码）...
...开前要先 InitializeSerial，波特率在打开前设置。
when 按钮_打开.Click() {
if not (串口通信器1.IsInitialized) {
串口通信器1.InitializeSerial()
}
串口通信器1.BaudRate = 下拉框_波特率.Selection
if 串口通信器1.OpenSerial() {
计时器_接收.T...
What's the difference between echo, print, and print_r in PHP?
I use echo and print_r much, and almost never use print .
11 Answers
11
...
Empty set literal?
...>> print(s)
set()
this is basically a more condensed way of doing {_ for _ in ()}, but, don't do this.
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What does pylint's “Too few public methods” message mean
...they hold.
If your class looks like this:
class MyClass(object):
def __init__(self, foo, bar):
self.foo = foo
self.bar = bar
Consider using a dictionary or a namedtuple instead. Although if a class seems like the best choice, use it. pylint doesn't always know what's best.
D...
How do I get a PHP class constructor to call its parent's parent's constructor?
.../ main class that everything inherits
class Grandpa
{
public function __construct()
{
}
}
class Papa extends Grandpa
{
public function __construct($bypass = false)
{
// only perform actions inside if not bypassing
if (!$bypass) {
}
// call Gra...
PHP array_filter with arguments
...rgument):
class LowerThanFilter {
private $num;
function __construct($num) {
$this->num = $num;
}
function isLower($i) {
return $i < $this->num;
}
}
Usage (demo):
$arr = array(7, 8, 9, 10, 11, 12, 13);
$matches = ...
Python division
...t:
>>> float(10 - 20) / (100 - 10)
-0.1111111111111111
or from __future__ import division, which the forces / to adopt Python 3.x's behavior that always returns a float.
>>> from __future__ import division
>>> (10 - 20) / (100 - 10)
-0.1111111111111111
...
Where is my Django installation?
...go
<module 'django' from '/usr/local/lib/python2.6/dist-packages/django/__init__.pyc'>
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How can I force division to be floating point? Division keeps rounding down to 0?
...hon 3, it produces a float. We can get the new behaviour by importing from __future__.
>>> from __future__ import division
>>> a = 4
>>> b = 6
>>> c = a / b
>>> c
0.66666666666666663
...
How can I force users to access my page over HTTPS instead of HTTP?
...basically like what you wrote, but doesn't have any hardcoded values:
if($_SERVER["HTTPS"] != "on")
{
header("Location: https://" . $_SERVER["HTTP_HOST"] . $_SERVER["REQUEST_URI"]);
exit();
}
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