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Can I add comments to a pip requirements file?

I'd like to add comments for a few packages in a pip requirements file. (Just to explain why that package is on the list.) Can I do this? ...
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Precedence and bitmask operations

I've come across a (seemingly) very strange case. 1 Answer 1 ...
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How to vertically align elements in ?

...ntal <ul> and I need to center each <li> in it vertically. My markup is below. Each <li> has a border, and I need the items as well as their contents to be in the middle vertically. Please help; I am new to CSS. ...
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Android SQLite: nullColumnHack parameter in insert/replace methods

The Android SDK has some convenience methods for manipulating data with SQLite. However both the insert and replace methods use some nullColumnHack parameter which usage I don't understand. ...
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regex to match a single character that is anything but a space

I need to match a single character that is anything but a space but I don't know how to do that with regex. 2 Answers ...
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Java time-based map/cache with expiring keys [closed]

Do any of you know of a Java Map or similar standard data store that automatically purges entries after a given timeout? This means aging, where the old expired entries “age-out” automatically. ...
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Why doesn't django's model.save() call full_clean()?

I'm just curious if anyone knows if there's good reason why django's orm doesn't call 'full_clean' on a model unless it is being saved as part of a model form. ...
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Set time part of DateTime in ruby

Say I have a datetime object eg DateTime.now . I want to set hours and minutes to 0 (midnight). How can I do that? 4 Ans...
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Using .sort with PyMongo

With PyMongo, when I try to retrieve objects sorted by their 'number' and 'date' fields like this: 1 Answer ...
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Inline code highlighting in reStructuredText

... Having looked into this some more I stumbled upon the document reStructuredText Interpreted Text Roles. From this document: Interpreted text uses backquotes (`) around the text. An explicit role marker may optionally appear before or after the text, ...