大约有 5,475 项符合查询结果（耗时：0.0181秒） [XML]
How to find a hash key containing a matching value
...key for a given value. If
not found, returns nil.
h = { "a" => 100, "b" => 200 }
h.index(200) #=> "b"
h.index(999) #=> nil
So to get "orange", you could just use:
clients.key({"client_id" => "2180"})
...
How to center an iframe horizontally?
...
Add display:block; to your iframe css.
div, iframe {
width: 100px;
height: 50px;
margin: 0 auto;
background-color: #777;
}
iframe {
display: block;
border-style:none;
}
<div>div</div>
<iframe src="data:,iframe"></iframe>
...
Add single element to array in numpy
...
f = np.array(d)
13.5 ms ± 277 µs per loop (mean ± std. dev. of 7 runs, 100 loops each)
Pre-allocating numpy array:
e = np.zeros((n,))
for k in range(n):
e[k] = k
9.92 ms ± 752 µs per loop (mean ± std. dev. of 7 runs, 100 loops each)
When the final size is unkown pre-allocating is dif...
Flatten list of lists [duplicate]
...hod way of flattening an iterable of iterables... What if the sublists had 100 elements? I certainly wouldn't want to be typing the listcomp code for that one...
– Jon Clements♦
Jun 29 '12 at 15:46
...
How to print pandas DataFrame without index
...='psql', showindex=False)
df = pd.DataFrame({'col1': np.random.randint(0, 100, 10),
'col2': np.random.randint(50, 100, 10),
'col3': np.random.randint(10, 10000, 10)})
pprint_df(df)
Specifically, the showindex=False, as the name says, allows you to not show index. The output would look ...
【BLE技术内幕】BLE技术揭秘 - 创客硬件开发 - 清泛IT论坛，有思想、有深度
...。该参数值以10 ms为单位，监控超时值可以从最小值10（100 ms）到3200（32.0 s）。超时必须大于有效的连接间隔。
3.4.3 有效连接间隔Effective Connection Interval有效连接间隔等于两个连接事件之间的时间跨度，假设从机跳过最大数量...
Changing position of the Dialog on screen android
...ow().getAttributes();
wmlp.gravity = Gravity.TOP | Gravity.LEFT;
wmlp.x = 100; //x position
wmlp.y = 100; //y position
dialog.show();
Here x position's value is pixels from left to right. For y position value is from bottom to top.
...
How exactly does tail recursion work?
...
+100
You ask why "it doesn't require stack to remember its return address".
I would like to turn this around. It does use the stack to r...
facebook: permanent Page Access Token?
...nyone who gets to the last step, and the browser just returns: message: "(#100) Tried accessing nonexisting field (accounts) on node type (Page)", type: "OAuthException", code: 100 go to the FB Access Token Debugger and test your long_lived_access_token. Consistently I've seen that after a few min...
Resize image in PHP
...
function scale($scale) {
$width = $this->getWidth() * $scale/100;
$height = $this->getheight() * $scale/100;
$this->resize($width,$height);
}
function resize($width,$height) {
$new_image = imagecreatetruecolor($width, $height);
imagecopyresampled($...