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mongodb group values by multiple fields

... $slice just off the basic aggregation result. For "large" results, run parallel queries instead for each grouping ( a demonstration listing is at the end of the answer ), or wait for SERVER-9377 to resolve, which would allow a "limit" to the number of items to $push to an array. db.books.aggregate(...
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How do you serialize a model instance in Django?

... You can easily use a list to wrap the required object and that's all what django serializers need to correctly serialize it, eg.: from django.core import serializers # assuming obj is a model instance serialized_obj = serializers.serialize('json', [ obj, ]) ...
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Building a minimal plugin architecture in Python

... Mine is, basically, a directory called "plugins" which the main app can poll and then use imp.load_module to pick up files, look for a well-known entry point possibly with module-level config params, and go from there. I use file-monitorin...
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Exploitable PHP functions

...purpose isn't to list functions that should be blacklisted or otherwise disallowed. Rather, I'd like to have a grep -able list of red-flag keywords handy when searching a compromised server for back-doors. ...
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Python name mangling

...ld Python guys despise this default - but it is the default anyway, so I really recommend you to follow it, even if you feel uncomfortable. If you really want to send the message "Can't touch this!" to your users, the usual way is to precede the variable with one underscore. This is just a conventi...
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Why use def main()? [duplicate]

...ink I still have something else to add. Reasons to have that if statement calling main() (in no particular order): Other languages (like C and Java) have a main() function that is called when the program is executed. Using this if, we can make Python behave like them, which feels more familiar for ...
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Chrome, Javascript, window.open in new tab

...pup’) by specifying options in the 3rd parameter 3. If the window.open call was not part of a user-initiated event, it’ll open in a new window. 4. A “user initiated event” does not have to the same function call – but it must originate in the function invoked by a user click 5. If a use...
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How to clear MemoryCache?

...clear it first. What is the quickest way to do this? Should I loop through all the items and remove them one at a time or is there a better way? ...
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How to efficiently compare two unordered lists (not sets) in Python?

... For short lists, big-O analysis is usually irrelevant because the timings are dominated by constant factors. For the longer lists, I suspect something is wrong with your benchmarking. For 100 ints with 5 repeats each, I get: 127 usec for sorted and 42 for Count...
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Characters allowed in a URL

... The characters allowed in a URI are either reserved or unreserved (or a percent character as part of a percent-encoding) http://en.wikipedia.org/wiki/Percent-encoding#Types_of_URI_characters says these are RFC 3986 unreserved characters ...