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What are the options for storing hierarchical data in a relational database? [closed]
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My favorite answer is as what the first sentence in this thread suggested. Use an Adjacency List to maintain the hierarchy and use Nested Sets to query the hierarchy.
The problem up until now has been that the coversion method from an Adjacecy List...
Double Iteration in List Comprehension
...for word in sentence]
Example:
>>> text = (("Hi", "Steve!"), ("What's", "up?"))
>>> [word for sentence in text for word in sentence]
['Hi', 'Steve!', "What's", 'up?']
This also works for generators
>>> text = (("Hi", "Steve!"), ("What's", "up?"))
>>> gen = (...
Most efficient way to concatenate strings?
What's the most efficient way to concatenate strings?
17 Answers
17
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What's the easiest way to escape HTML in Python?
...'xmlcharrefreplace')
Don't forget to decode data to unicode first, using whatever encoding it was encoded.
However in my experience that kind of encoding is useless if you just work with unicode all the time from start. Just encode at the end to the encoding specified in the document header (utf-...
How can I pipe stderr, and not stdout?
... writes information to stdout and stderr , and I need to grep through what's coming to stderr , while disregarding stdout .
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What is the difference between and ?
What is the difference between <html lang="en"> and <html lang="en-US"> ? What other values can follow the dash?
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How can I get a resource “Folder” from inside my jar File?
... certain File, I would use class.getResourceAsStream and I would be fine!! What I actually want to do is to load a "Folder" within the resources folder, loop on the Files inside that Folder and get a Stream to each file and read in the content... Assume that the File names are not determined before ...
Determine the line of code that causes a segmentation fault?
...:3 in main
==4848==ABORTING
The output is slightly more complicated than what gdb would output but there are upsides:
There is no need to reproduce the problem to receive a stack trace. Simply enabling the flag during development is enough.
ASANs catch a lot more than just segmentation faults. M...
How to shut down the computer from C#
What's the best way to shut down the computer from a C# program?
16 Answers
16
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Disabled UIButton not faded or grey
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just change state config to disable and choose what you want, background Image for disabled state
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