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Determine if variable is defined in Python [duplicate]

...is not always obvious because (1) the variable could be conditionally set, and (2) the variable could be conditionally deleted. I'm looking for something like defined() in Perl or isset() in PHP or defined? in Ruby. ...
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What is the meaning of the planned “private protected” C# access modifier?

...uage feature implementation status , with planned language features for C# and VB. 6 Answers ...
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How to use gitignore command in git

I'm working first time on git. I have pushed my branch on github and it pushed all the library and documents into the github. Now what can I do and how can I use gitignore command to avoid the same mistake again. ...
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In OS X Lion, LANG is not set to UTF-8, how to fix it?

I try to setup postgress in OS X Lion, and find that is not correctly setup the LOCALE environment var. 5 Answers ...
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How come an array's address is equal to its value in C?

In the following bit of code, pointer values and pointer addresses differ as expected. 6 Answers ...
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Why do you use typedef when declaring an enum in C++?

I haven't written any C++ in years and now I'm trying to get back into it. I then ran across this and thought about giving up: ...
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How to play a notification sound on websites?

...ern browsers) <embed> (Fallback) Codes used MP3 for Chrome, Safari and Internet Explorer. OGG for Firefox and Opera. share | improve this answer | follow ...
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How to exclude a directory in find . command

I'm trying to run a find command for all JavaScript files, but how do I exclude a specific directory? 38 Answers ...
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How do you dismiss the keyboard when editing a UITextField

...eld sends its action when the user hits the Return ("Done", whatever) key, and also sends its delegate -textFieldShouldReturn:. – Noah Witherspoon Nov 8 '08 at 5:13 ...
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How do I get ASP.NET Web API to return JSON instead of XML using Chrome?

... This is a surprisingly overlooked answer, and although the original question wasn't totally clear, this directly makes JSON the default response for a web browser (which sends Accept: text/html). Good job. – gregmac Jan 15 '13 a...