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String comparison in Python: is vs. == [duplicate]

I noticed a Python script I was writing was acting squirrelly, and traced it to an infinite loop, where the loop condition was while line is not '' . Running through it in the debugger, it turned out that line was in fact '' . When I changed it to !='' rather than is not '' , it worked fine. ...
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JUnit 4 compare Sets

How would you succinctly assert the equality of Collection elements, specifically a Set in JUnit 4? 9 Answers ...
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Remove items from one list in another

I'm trying to figure out how to traverse a generic list of items that I want to remove from another list of items. 9 Answer...
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How do I pronounce “=>” as used in lambda expressions in .Net

I very rarely meet any other programmers! 16 Answers 16 ...
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What does string::npos mean in this code?

What does the phrase std::string::npos mean in the following snippet of code? 12 Answers ...
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How to use a variable inside a regular expression?

I'd like to use a variable inside a regex , how can I do this in Python ? 10 Answers ...
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How to center a checkbox in a table cell?

The cell contains nothing but a checkbox. It is rather wide because of text in the table header row. How do I center the checkbox (with inline CSS in my HTML? (I know)) ...
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How to stop Visual Studio from “always” checking out solution files?

For apparently no reason, every time I open my solution, Visual Studio checks the sln file out. 8 Answers ...
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What does the “>” (greater-than sign) CSS selector mean?

For example: 8 Answers 8 ...
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Java ResultSet how to check if there are any results

Resultset has no method for hasNext. I want to check if the resultSet has any value 21 Answers ...