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How to create abstract properties in python abstract classes
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Since Python 3.3 a bug was fixed meaning the property() decorator is now correctly identified as abstract when applied to an abstract method.
Note: Order matters, you have to use @property before @abstractmethod
Python 3.3+: (python docs):
class C(ABC):
@property
@abstractmethod
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How do I expand the output display to see more columns of a pandas DataFrame?
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Nowadays options can also be set as assignments to attributes of pd.options, e.g. pd.options.display.max_rows = 999
– unutbu
Jun 7 '15 at 0:19
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Are nested try/except blocks in python a good programming practice?
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In summary the only problem would be your code getting too much indented. If you feel like it, try to simplify some of the nestings like lqc suggested in the suggested answer above.
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Difference between applicationContext.xml and spring-servlet.xml in Spring Framework
...antiation order is: the root (application context), then FrameworkServlet.
Now it should be clear why they are important in which scenario.
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foll...
Cartesian product of multiple arrays in JavaScript
...b ? cartesian(f(a, b), ...c) : a);
Special thanks to ZuBB for letting me know about linter problems with the original code.
Update 2020:
Since I wrote this answer we got even better builtins, that can finally let us reduce (no pun intended) the code to just 1 line!
const cartesian =
(...a) => ...
Node.js project naming conventions for files & folders
...ion not for directory structures. When we get to this topic, we expect to know if files are better named with dashes, underscores or camelCase. I will upvote, if this is added to this answer.
– Tronix117
Aug 4 '14 at 14:51
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How do you generate dynamic (parameterized) unit tests in python?
...(a, b):
def test(self):
self.assertEqual(a,b)
return test
if __name__ == '__main__':
for t in l:
test_name = 'test_%s' % t[0]
test = test_generator(t[1], t[2])
setattr(TestSequense, test_name, test)
unittest.main()
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MongoDB not equal to
...8b1a7768972d396fe2268"), "author" : "you", "post" : "how to query" }
And now $not, which takes in predicate ($ne) and negates it ($not):
db.test.find({'post': {$not: {$ne : ""}}})
{ "_id" : ObjectId("4f68b19c768972d396fe2267"), "author" : "me", "post" : "" }
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When should the volatile keyword be used in C#?
...ode still in production environments and the devs that maintain it should know why that keyword is there and if its safe to remove.
– Paul Easter
Jan 1 '15 at 22:43
3
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How can I recover the return value of a function passed to multiprocessing.Process?
... print str(procnum) + ' represent!'
return_dict[procnum] = procnum
if __name__ == '__main__':
manager = multiprocessing.Manager()
return_dict = manager.dict()
jobs = []
for i in range(5):
p = multiprocessing.Process(target=worker, args=(i,return_dict))
jobs.ap...