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How do I migrate a model out of one django app and into a new one?
... if not db.dry_run:
# For permissions, GenericForeignKeys, etc to work properly after migrating.
orm['contenttypes.contenttype'].objects.filter(
app_label=self.old_app,
model=self.old_model,
).update(
app_label=s...
How to install 2 Anacondas (Python 2 and 3) on Mac OS
...ach ipython notebook sets up another port (localhost:8888, localhost:8889, etc.). So just keep them straight and you're all set.
– alexis
May 1 '15 at 15:52
5
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Case objects vs Enumerations in Scala
...xtends Enumeration {
val GBP = Value("GBP")
val EUR = Value("EUR") //etc.
}
Then you can do:
val ccy = Currency.withName("EUR")
This is useful when wishing to persist enumerations (for example, to a database) or create them from data residing in files. However, I find in general that enumer...
Difference between initLoader and restartLoader in LoaderManager
...d to change the Loader's query (i.e. you want to get filtered/sorted data, etc.).
– Alex Lockwood
Dec 3 '13 at 19:50
4
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Regular expressions in C: examples?
... of other languages. The POSIX syntax is the syntax used by grep, sed, vi, etc.
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1030 Got error 28 from storage engine
...messed with them, i just cleared them too.
echo "clear" > access.log
etc.
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Copying text with color from Notepad++
...ault Edit > Copy command provided RTF as a default for MS Word, Outlook etc.
– Jonathan Watmough
Sep 26 '16 at 14:16
2
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How to learn R as a programming language [closed]
...ion is prompted by lack of understanding of such functions as parse, eval, etc. which may not find frequent use by an R user with a 'statistics' persuasion.
...
How to plot two columns of a pandas data frame using points?
...'])
plt.show() # Depending on whether you use IPython or interactive mode, etc.
and remember that you can access a NumPy array of the column's values with df.col_name_1.values for example.
I ran into trouble using this with Pandas default plotting in the case of a column of Timestamp values with ...
How to check if array is empty or does not exist? [duplicate]
...arios, such as null values, other types of objects with a length property, etc. It is also not very idiomatic JavaScript.
The foolproof approach
Taking some inspiration from the comments, below is what I currently consider to be the foolproof way to check whether an array is empty or does not exist....