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sqlalchemy: how to join several tables by one query?
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How do you organize your version control repository?
...o reference ANYTHING with a relative path like .\some\dirs\here or ..\some\more\dirs, ALWAYS use absolute paths.
NEVER allow a project build script to reference ANYTHING using an absolute path that does not have a configurable root directory, like C:\some\dirs\here or \\server\share\more\stuff\there...
Declare and initialize a Dictionary in Typescript
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How to delete all datastore in Google App Engine?
...his in 500 entity sets or else you'll get: BadRequestError: cannot delete more than 500 entities in a single call
– marcc
Oct 1 '10 at 1:43
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Permanently add a directory to PYTHONPATH?
...the purpose.
superuser.com may be a better place to ask further, i.e. for more details if you need specifics about how to enrich an environment variable in your chosen platform and shell, since it's not really a programming question per se.
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How can I return to a parent activity correctly?
...instance you are terminating lives on top of an instance of activity A. In more complex workflows (for instance, launching activity B from a notification) this might not be the case and you have to correctly launch activity A from B.
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How do you test running time of VBA code?
...er. The most accurate one I know is QueryPerformanceCounter. Google it for more info. Try pushing the following into a class, call it CTimer say, then you can make an instance somewhere global and just call .StartCounter and .TimeElapsed
Option Explicit
Private Type LARGE_INTEGER
lowpart As Lo...
Import multiple csv files into pandas and concatenate into one DataFrame
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The same thing more concise, and perhaps faster as it doesn't use a list: df = pd.concat((pd.read_csv(f) for f in all_files)) Also, one should perhaps use os.path.join(path, "*.csv") instead of path + "/*.csv", which makes it OS independe...
Why does dividing two int not yield the right value when assigned to double?
...s no benefit in using C++-style casts here and they clutter the code a lot more than C-style casts. Arithmetic cast is exactly the context where C-style casts are perfectly appropriate and actually more appropriate than other casts.
– AnT
Sep 27 '11 at 16:14
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Why does Dijkstra's algorithm use decrease-key?
...he priority queue, then indeed Dijkstra's algorithm will be asymptotically more efficient when using decrease-key.
In short, using decrease-key, plus a good priority queue, can drop the asymptotic runtime of Dijkstra's beyond what's possible if you keep doing enqueues and dequeues.
Besides this po...