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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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Node.js - Find home directory in platform agnostic way

Process.platform returns "win32" for Windows. On Windows a user's home directory might be C:\Users[USERNAME] or C:\Documents and Settings[USERNAME] depending on which version of Windows is being used. On Unix this isn't an issue. ...
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event.preventDefault() function not working in IE

...sciende 24.1k88 gold badges4646 silver badges6666 bronze badges 48 ...
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How do I resolve ClassNotFoundException?

I am trying to run a Java application, but getting this error: 21 Answers 21 ...
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Postgresql - unable to drop database because of some auto connections to DB

... You can prevent future connections: REVOKE CONNECT ON DATABASE thedb FROM public; (and possibly other users/roles; see \l+ in psql) You can then terminate all connections to this db except your own: SELECT pid, pg_terminate_backend(pid) FROM pg_st...
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How to make a great R reproducible example

... with colleagues, teaching, sending a bug report or searching for guidance on mailing lists and here on Stack Overflow, a reproducible example is often asked and always helpful. ...
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UIDevice uniqueIdentifier deprecated - What to do now?

...is unique if a user uninstalls and re-installs the app: you will get a new one each time. But you might want it to be not unique, i. e. it should stay the same when the user uninstalls and re-installs the app. This requires a bit of effort, since the most reliable per-device-identifier seems to be ...
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Inspect element that only appear when other element is mouse overed/entered

Often I want to inspect an element (e.g. tooltip) that only appears when another element is mouse overed/entered. The element that appears, is made visible via jQuery's mouseenter event. ...
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The Following Module was built either with optimizations enabled or without debug information

... VS 2008 web project when debugging. I've checked that it's in debug mode on the non-web project in question and it's in Active(Debug). Deleted all items in my .NET 2.0 temp folder in Windows. Not sure what else to do here. ...
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Why is the order in dictionaries and sets arbitrary?

I don't understand how looping over a dictionary or set in python is done by 'arbitrary' order. 6 Answers ...