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Booleans, conditional operators and autoboxing
... of returnsNull()) to make it type boolean. This of course causes the NPE from the null returned at run-time.
For E2, types of the 2nd and 3rd operands are <special null type> (not Boolean as in E1!) and boolean respectively, so no specific typing clause applies (go read 'em!), so the final "...
What are the pros and cons of performing calculations in sql vs. in your application
...
I think that a good rule of thumb is: don't bring back from SQL server rows of data you don't ultimately need. For example, if you have to perform aggregate operations, they likely belong in SQL. Joins between tables or subqueries? SQL. That's also the approach we use with badges...
jsonify a SQLAlchemy result set in Flask [duplicate]
...at this question. It shows how to discover columns programmatically. So, from that I created the code below. It works for me, and I'll be using it in my web app. Happy coding!
def to_json(inst, cls):
"""
Jsonify the sql alchemy query result.
"""
convert = dict()
# add your ...
Why is it common to put CSRF prevention tokens in cookies?
... the same user account as the victim's auth session cookie will be missing from the request (it would be the attacker's - therefore it won't be associated server side with the victim's session).
As well as the Synchronizer Token Pattern there is also the Double Submit Cookie CSRF prevention method,...
How can I add new array elements at the beginning of an array in Javascript?
...tation. Virtually every language that has the ability to push/pop elements from an array will also have the ability to unshift/shift (sometimes called push_front/pop_front) elements, you should never have to implement these yourself.
As pointed out in the comments, if you want to avoid mutating y...
Android REST client, Sample?
...ted. It is by no means intended to be an exhaustive list.
Volley (this is from Google)
RESTDroid
RoboSpice
Retrofit
Original Answer:
Presenting my approach to having REST clients on Android. I do not claim it is the best though :) Also, note that this is what I came up with in response to my requ...
Saving an Object (Data persistence)
... to show how more than one object could be saved into (and later read back from) the same file.
– martineau
Dec 25 '10 at 9:57
1
...
What is the difference between $(command) and `command` in shell programming?
...need to be seen as deprecated, e.g. the use of waitpid() that prevents you from from seeing the full 32 bits from the exit() parameter, but all shells except the recent Bourne Shell still use waitpid() instead of the waitid() call that is now available since 26 years.
– schily
...
How can I sort a dictionary by key?
What would be a nice way to go from {2:3, 1:89, 4:5, 3:0} to {1:89, 2:3, 3:0, 4:5} ?
I checked some posts but they all use the "sorted" operator that returns tuples.
...
What does enumerate() mean?
...ts counting at 0 but if you give it a second integer argument, it'll start from that number instead:
>>> for count, elem in enumerate(elements, 42):
... print count, elem
...
42 foo
43 bar
44 baz
If you were to re-implement enumerate() in Python, here are two ways of achieving that;...