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How to crop an image in OpenCV using Python
...mentioned that but it took me quite some time to find out (i.e., debugging etc). So, I think it worths mentioning.
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Why is it string.join(list) instead of list.join(string)?
...t because:
it must work for different iterables too (tuples, generators, etc.)
it must have different behavior between different types of strings.
There are actually two join methods (Python 3.0):
>>> b"".join
<built-in method join of bytes object at 0x00A46800>
>>> ""....
Why do we always prefer using parameters in SQL statements?
...ee SET salary = 9999999 WHERE empID = 10; --
1; DROP TABLE employee; --
// etc.
When you execute this query, it will perform a SELECT and an UPDATE or DROP, or whatever they wanted. The -- at the end simply comments out the rest of your query, which would be useful in the attack if you were concat...
Storing integer values as constants in Enum manner in java [duplicate]
...rotocol which you can't change, or the enums represent columns in a table, etc).
In almost all cases I suggest using an EnumMap instead. It decouples the components more completely, if that was the concern, or if the enums represent column indices or something similar, you can easily make changes ...
Why use String.Format? [duplicate]
...e simple format indicators (like fixed width, currency, character lengths, etc) right in the format string. You can even create your own format providers for things like expanding enums, mapping specific inputs to much more complicated outputs, or localization.
You can do some powerful things by put...
StatusbarTools 扩展 - 状态栏自定义工具 · App Inventor 2 中文网
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StatusbarTools扩展为App Inventor开发者提供了强大的状态栏自定义功能，允许完全控制应用的状态栏外观，包括背景颜色、透明度设置以及图标颜色样式。
扩展下载
StatusbarTools扩展: com.SalmanDev.Statu...
How do you find the current user in a Windows environment?
... you can use the following:
[System.Security.Principal.WindowsIdentity]::GetCurrent().Name - Gives you the fully qualified username (e.g. Domain\Username). This is also the most secure method because it cannot be overridden by the user like the other $Env variables below.
$Env:Username - Gets just...
How does functools partial do what it does?
...Roughly, partial does something like this (apart from keyword args support etc):
def partial(func, *part_args):
def wrapper(*extra_args):
args = list(part_args)
args.extend(extra_args)
return func(*args)
return wrapper
So, by calling partial(sum2, 4) you create a ...
Dynamically load JS inside JS [duplicate]
...g.
<script src="scriptloader.js" data-main="file1.js,file2.js,file3.js,etc." ></script>
and do a element.getAttribute("data-main").split(',')
such as
var target = document.currentScript || (function() {
var scripts = document.getElementsByTagName('script');
// Note: this is for...
How can I save a screenshot directly to a file in Windows? [closed]
...wrote a little AutoHotkey script calling GDI+ functions to do screenshots. Etc.
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