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What is the purpose of Flask's context stacks?
... up models
db.create_all()
In this case, the Flask-SQLAlchemy extension knows about the app application, but during create_all() it will throw an error complaining about there not being an application context. This error is justified; you never told Flask what application it should be dealing with...
Sleep until a specific time/date
...anted to wait until next week:
expr `date -d "next week" +%s` - `date -d "now" +%s`
Just substitute "next week" with whatever date you'd like to wait for, then assign this expression to a value, and sleep for that many seconds:
startTime=$(date +%s)
endTime=$(date -d "next week" +%s)
timeToWait=...
Temporarily disable auto_now / auto_now_add
...odels.CharField(max_length=255)
updated_at = models.DateTimeField(auto_now=True, auto_now_add=True)
# my tests
foo = FooBar.objects.get(pk=1)
# force a timestamp
lastweek = datetime.datetime.now() - datetime.timedelta(days=7)
FooBar.objects.filter(pk=foo.pk).update(updated_at=lastweek)
# do...
What is __init__.py for?
...make two blank files, the init.py file (with underscores) and datetime.py. Now open an interpreter, import sys, and issue sys.path.insert(0, '/path/to/datetime'), replacing that path with the path to whatever directory you just made. Now try something like from datetime import datetime;datetime.now(...
How to avoid having class data shared among instances?
...f.x
A change method sets self.temp
Pretty straight forward so far yeah? Now let's start playing around with this class. Let's initialize this class first:
a = A('Tesseract')
Now do the following:
>>> print(a.temp)
Skyharbor
>>> print(A.temp)
Skyharbor
Well, a.temp worked ...
How does __proto__ differ from constructor.prototype?
...sheds full light over the matter
http://i.stack.imgur.com/KFzI3.png
I know I'm not the first one making this up but it was more interesting figuring it out that finding it :-). Anyway, after that I found e.g. this another diagram that I think says basicly the same:
Javascript object layout
The...
How can I add new keys to a dictionary?
... value is in the end too. Anyway answer has been edited and is much better now. Updating with a dictionary is good when it's likely that it contains many items.
– Jean-François Fabre♦
Jan 20 at 16:26
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How to convert DateTime? to DateTime
...ode.
DateTime UpdatedTime = _objHotelPackageOrder.UpdatedDate ?? DateTime.Now;
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Implement touch using Python?
...k we should use pathlib2 instead of pathlib because pathlib is bugfix-only now. Therefore, on Python 2.7: pip install pathlib2 and then from pathlib2 import Path.
– Ian Lin
Nov 23 '18 at 8:58
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How to spread django unit tests over multiple files?
Now..
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