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What is the difference between NaN and None?

I am reading two columns of a csv file using pandas readcsv() and then assigning the values to a dictionary. The columns contain strings of numbers and letters. Occasionally there are cases where a cell is empty. In my opinion, the value read to that dictionary entry should be None but instead ...
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Checkstyle vs. PMD

We are introducing static analysis tools into the build system for our Java product. We are using Maven2 so Checkstyle and PMD integration come for free. However it looks like there is a large overlap in functionality between these two tools, in terms of enforcing basic style rules. ...
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Firefox session cookies

Generally speaking, when given a cookie that has no expiration period, modern browsers will consider this cookie to be a 'session cookie', they will remove the cookie at the end of the browsing session (generally when the browser instance closes). ...
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How can I add a string to the end of each line in Vim?

I want to add * to the end of each line in Vim. 10 Answers 10 ...
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php execute a background process

I need to execute a directory copy upon a user action, but the directories are quite large, so I would like to be able to perform such an action without the user being aware of the time it takes for the copy to complete. ...
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Why do I get access denied to data folder when using adb?

I connected to my live device using the adb and the following commands: 14 Answers 14 ...
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If vs. Switch Speed

Switch statements are typically faster than equivalent if-else-if statements (as e.g. descibed in this article ) due to compiler optimizations. ...
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Fixing slow initial load for IIS

IIS has an annoying feature for low traffic websites where it recycles unused worker processes, causing the first user to the site after some time to get an extremely long delay (30+ seconds). ...
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How can I find script's directory with Python? [duplicate]

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How to convert an OrderedDict into a regular dict in python3

I am struggling with the following problem: I want to convert an OrderedDict like this: 8 Answers ...