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How unique is UUID?

How safe is it to use UUID to uniquely identify something (I'm using it for files uploaded to the server)? As I understand it, it is based off random numbers. However, it seems to me that given enough time, it would eventually repeat it self, just by pure chance. Is there a better system or a patter...
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Actual meaning of 'shell=True' in subprocess

I am calling different processes with the subprocess module. However, I have a question. 5 Answers ...
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what's the correct way to send a file from REST web service to client?

I've just started to develop REST services, but I've come across a difficult situation: sending files from my REST service to my client. So far I've gotten the hang of how to send simple data types (strings, integers, etc) but sending a file is a different matter since there are so many file formats...
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How to 'insert if not exists' in MySQL?

I started by googling, and found this article which talks about mutex tables. 10 Answers ...
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Failed to enable constraints. One or more rows contain values violating non-null, unique, or foreign

I make an outer join and executed successfully in the informix database but I get the following exception in my code: 24 ...
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What's the difference between equal?, eql?, ===, and ==?

I am trying to understand the difference between these four methods. I know by default that == calls the method equal? which returns true when both operands refer to exactly the same object. ...
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Is it possible to dynamically compile and execute C# code fragments?

I was wondering if it is possible to save C# code fragments to a text file (or any input stream), and then execute those dynamically? Assuming what is provided to me would compile fine within any Main() block, is it possible to compile and/or execute this code? I would prefer to compile it for perfo...
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Display a float with two decimal places in Python

I have a function taking float arguments (generally integers or decimals with one significant digit), and I need to output the values in a string with two decimal places (5 -> 5.00, 5.5 -> 5.50, etc). How can I do this in Python? ...
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When should I choose Vector in Scala?

It seems that Vector was late to the Scala collections party, and all the influential blog posts had already left. 6 Answ...
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What does the caret (^) character mean?

I saw an answer to a question here that helps restore a deleted file in git. 8 Answers ...