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How to check type of files without extensions in python?

I have a folder full of files and they don't have an extension. How can I check file types? I want to check the file type and change the filename accordingly. Let's assume a function filetype(x) returns a file type like png . I want to do this: ...
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WPF: Setting the Width (and Height) as a Percentage Value

...nt="Stretch" ... That will make the Textbox element stretch horizontally and fill all the parent space horizontally (actually it depends on the parent panel you're using but should work for most cases). Percentages can only be used with grid cell values so another option is to create a grid and p...
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What is a good Java library to zip/unzip files? [closed]

I looked at the default Zip library that comes with the JDK and the Apache compression libs and I am unhappy with them for 3 reasons: ...
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What does $.when.apply($, someArray) do?

I'm reading about Deferreds and Promises and keep coming across $.when.apply($, someArray) . I'm a little unclear on what this does exactly, looking for an explanation that one line works exactly (not the entire code snippet). Here's some context: ...
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Conversion of a datetime2 data type to a datetime data type results out-of-range value

... I changed my datacolumns and used typeof now... Further I found my problem. there was 1 datarow that contained a wrong date, which triggered the error – Gerbrand Aug 26 '09 at 5:46 ...
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Form onSubmit determine which submit button was pressed [duplicate]

I have a form with two submit buttons and some code: 8 Answers 8 ...
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Once upon a time, when > was faster than < … Wait, what?

...tc. He also explains that the actual meaning of depth values (which is top and which isn't) can also be customized. I understand so far. And then the author says something unbelievable: ...
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Xcode Project vs. Xcode Workspace - Differences

I am trying to understand how the whole ecosystem of iOS works. Until now, I could find an answer for most of my question (and trust me, there have been a lots of them), but for this one, there seems to be no clear answer yet. ...
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What is difference between Collection.stream().forEach() and Collection.forEach()?

I understand that with .stream() , I can use chain operations like .filter() or use parallel stream. But what is difference between them if I need to execute small operations (for example, printing the elements of the list)? ...
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Java code for getting current time [duplicate]

... Both new java.util.Date() and System.currentTimeMillis() will give you current system time. share | improve this answer | f...