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Python: Checking if a 'Dictionary' is empty doesn't seem to work
..."Nobody is online, please use REGISTER command" \
" in order to register into the server")
else:
socket.send("ONLINE " + ' ' .join(self.users.keys()))
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improv...
Implementing slicing in __getitem__
...d. Simply look at the start, stop, and step members of the slice object in order to get the components for the slice.
>>> class C(object):
... def __getitem__(self, val):
... print val
...
>>> c = C()
>>> c[3]
3
>>> c[3:4]
slice(3, 4, None)
>>> c[...
Can table columns with a Foreign Key be NULL?
...u mean by 'the above'? Note that if you're referring to another answer the order may change.
– d219
Mar 8 '19 at 17:35
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How do I ignore ampersands in a SQL script running from SQL Plus?
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Highly active question. Earn 10 reputation in order to answer this question. The reputation requirement helps protect this question from spam and non-answer activity.
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How do I make CMake output into a 'bin' dir?
...s. Absolutely nothing was working until coming to the realization that the order of these commands is very relevant.
– arthropod
Dec 28 '19 at 0:06
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SQLite add Primary Key
...tests (in sqlite shell):
sqlite> explain query plan select * from tab1 order by i,j;
0|0|0|SCAN TABLE tab1 USING INDEX sqlite_autoindex_tab1_1
sqlite> drop index sqlite_autoindex_tab1_1;
Error: index associated with UNIQUE or PRIMARY KEY constraint cannot be dropped
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How can I clear event subscriptions in C#?
...ener
procedure DoClearEventHandler; message WM_Clear;
end;
And, in order to respond to that "message", a "event handler" respond, whether is a single delegate or multiple delegates.
Summary:
"Event" is the "question", "event handler (s)" are the answer (s).
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What is “callback hell” and how and why does RX solve it?
...e from event handling code. You can easily handle details like async event ordering that are a nightmare when using state variables. I found RX was the cleanest implementation to perform a new network request after 3 network responses returned or to error handle the whole chain if one does not retur...
Display names of all constraints for a table in Oracle SQL
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How do I test an AngularJS service with Jasmine?
...mple above (only creating the module doesn't instantiate the service).
In order to the service to be instantiated angular.injector has to be called with the module where our service is defined. Then, we can ask to the new injector object for the service and its only then when the service is finally...