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What exactly does += do in python?

I need to know what += does in python. It's that simple. I also would appreciate links to definitions of other short hand tools in python. ...
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How to for each the hashmap? [duplicate]

I have this field: 7 Answers 7 ...
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str.startswith with a list of strings to test for

I'm trying to avoid using so many if statements and comparisons and simply use a list, but not sure how to use it with str.startswith : ...
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Meaning of @classmethod and @staticmethod for beginner? [duplicate]

Could someone explain to me the meaning of @classmethod and @staticmethod in python? I need to know the difference and the meaning. ...
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Number of days between two NSDates [duplicate]

How could I determine the number of days between two NSDate values (taking into consideration time as well)? 16 Answers ...
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How do I select child elements of any depth using XPath?

Suppose I have this (simplified): 4 Answers 4 ...
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What are the typical reasons Javascript developed on Firefox fails on IE? [closed]

I developed some javascript enhanced pages that run fine on recent Firefox and Safari. I missed to check in Internet Explorer, and now I find the pages don't work on IE 6 and 7 (so far). The scripts are somehow not executed, the pages show as if javascript wasn't there, although some javascript is e...
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Uncaught SyntaxError: Unexpected token :

I am running an AJAX call in my MooTools script, this works fine in Firefox but in Chrome I am getting a Uncaught SyntaxError: Unexpected token : error, I cannot determine why. Commenting out code to determine where the bad code is yields nothing, I am thinking it may be a problem with the JSON be...
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SQL Joins Vs SQL Subqueries (Performance)?

I wish to know if I have a join query something like this - 8 Answers 8 ...
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Efficiency of Java “Double Brace Initialization”?

In Hidden Features of Java the top answer mentions Double Brace Initialization , with a very enticing syntax: 15 Answe...