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Unpack a list in Python?
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edited Sep 10 '19 at 14:24
Flow
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Difference between Django's annotate and aggregate methods?
...> Book.objects.aggregate(average_price=Avg('price'))
{'average_price': 34.35}
Returns a dictionary containing the average price of all books in the queryset.
Annotation
>>> q = Book.objects.annotate(num_authors=Count('authors'))
>>> q[0].num_authors
2
>>> q[1].num_a...
XPath - Selecting elements that equal a value
...Novatchev
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Creating and throwing new exception
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edited Jul 7 '14 at 23:58
answered Jul 4 '14 at 23:05
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Command to escape a string in bash
...e.Paused until further notice.
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Is sizeof(bool) defined in the C++ language standard?
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4 Answers
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Why are Perl 5's function prototypes bad?
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Replacing some characters in a string with another character
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echo "$string" | tr xyz _
would replace each occurrence of x, y, or z with _, giving A__BC___...
setting multiple column using one update
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Just add parameters, split by comma:
UPDATE tablename SET column1 = "value1", column2 = "valu...
XPath: How to check if an attribute exists?
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ulidtko
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answered Sep 17 '10 at 18:26
Felix KlingFelix Kling
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