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check if variable is dataframe

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Cross field validation with Hibernate Validator (JSR 303)

... 287 Each field constraint should be handled by a distinct validator annotation, or in other words ...
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How to specify a multi-line shell variable?

...ad with a heredoc as shown below: read -d '' sql << EOF select c1, c2 from foo where c1='something' EOF echo "$sql" share | improve this answer | follow ...
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HTML Body says cz-shortcut-listen=“true” with Chrome's Developer Tools?

...e I'm making, and while using the Developer Tools on Google Chrome version 22.0.1229.94 m, I saw the <body> tag has the attribute cz-shortcut-listen="true" (which of course is not on my code). What does it mean and why is it showing up? (I tried looking it up in google, but found nothing...
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how to check if a form is valid programmatically using jQuery Validation Plugin

... 142 Use .valid() from the jQuery Validation plugin: $("#form_id").valid(); Checks whether the ...
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Pros and cons to use Celery vs. RQ [closed]

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C++ STL Vectors: Get iterator from index?

... 298 Try this: vector<Type>::iterator nth = v.begin() + index; ...
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How to find out if you're using HTTPS without $_SERVER['HTTPS']

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Is it possible to use the instanceof operator in a switch statement?

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Is it possible only to declare a variable without assigning any value in Python?

... | edited Mar 19 '09 at 22:50 answered Mar 19 '09 at 22:23 ...