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What is the most pythonic way to check if an object is a number?
...vector or a number is comparing apples to oranges - I can have a vector of strings or numbers, and I can have a single string or single number. You are interested in how many you have (1 or more), not what type you actually have.
my solution for this problem is to check whether the input is a singl...
Sql Server equivalent of a COUNTIF aggregate function
...Ls were not an issue, though this can be environment dependent. You could handle nulls such as:
SELECT SUM(CASE WHEN ISNULL(myColumn,0)=1 THEN 1 ELSE 0 END)
FROM AD_CurrentView
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IDENTITY_INSERT is set to OFF - How to turn it ON?
...ntent]
@ContentID int,
SET IDENTITY_INSERT tbl_content ON
...insert command...
SET IDENTITY_INSERT tbl_content OFF
GO
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Print newline in PHP in single quotes
...
FYI it is possible to get newlines into strings without double quotes:
printf('Please%1$sgive%1$sme%1$snewlines%1$s', PHP_EOL);
Which may be useful If your irrational fear of double quotes knows no bounds. Though I fear this cure may be worse than the disease. ...
Run a single migration file
...iveRecord::Migration
def change
add_column :products, :part_number, :string
end
end
You can create an instance of the migration and run migrate(:up) or migrate(:down) on an instance, like this:
$ rails console
>> require "db/migrate/20090408054532_add_part_number_to_products.rb"
>...
What Automatic Resource Management alternatives exist for Scala?
...ported: try with resources by using Using :), Example:
val lines: Try[Seq[String]] =
Using(new BufferedReader(new FileReader("file.txt"))) { reader =>
Iterator.unfold(())(_ => Option(reader.readLine()).map(_ -> ())).toList
}
or using Using.resource avoid Try
val lines: Seq[Strin...
PHP: How to check if image file exists?
...
You need the filename in quotation marks at least (as string):
if (file_exists('http://www.mydomain.com/images/'.$filename)) {
… }
Also, make sure $filename is properly validated. And then, it will only work when allow_url_fopen is activated in your PHP config
...
Android: Go back to previous activity
I want to do something simple on android app.
How is it possible to go back to a previous activity.
23 Answers
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Popup弹出菜单扩展 · App Inventor 2 中文网
...整个屏幕，而且配置视图的选项很少。这里介绍的扩展是Android弹出菜单的包装器。几乎所有属性都是可调的。
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Popup弹出菜单扩展是一...
How do I determine the current operating system with Node.js
...
While the string compare of process.platform === 'win32' seems more concise than the regex, and obviously quicker. The regex Mauvis has posted seems to be a better quality check. If Node/Windows every decided to return win64, winARM, e...