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Should import statements always be at the top of a module?
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One use case is avoiding circular imports (not usually sensible, but sometimes it is suitable). Sometimes class A in module m1 calls a method on class B in module m2 which constructs another instance of class A. If the method...
How do I profile memory usage in Python?
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This one has been answered already here: Python memory profiler
Basically you do something like that (cited from Guppy-PE):
>>> from guppy import hpy; h=hpy()
>>> h.heap()
Partition of a set of 48477 objects. T...
How is malloc() implemented internally? [duplicate]
Can anyone explain how malloc() works internally?
3 Answers
3
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Android: ProgressDialog.show() crashes with getApplicationContext
... returning just points to null. I think you're having a problem similar to one I had in that some of the code in the onCreate() is being run before the window is actually done being built. This is going to be a hack, but try launching a new Thread in a few hundred milliseconds (IIRC: 300-400 seemed ...
Check if object is file-like in Python
...o the fact that this is often useful, even in python. In general, when someone asks "how to foo", "don't foo" is not a highly satisfactory answer.
– AdamC
Oct 23 '15 at 19:13
1
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MySQL pagination without double-querying?
...g SQL_CALC_FOUND_ROWS with ORDER BY and LIMIT, according to the bug I mentioned.
– staticsan
May 4 '09 at 4:30
5
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Why does pycharm propose to change method to static
... not be a @staticmethod, and if you value zero warnings, you can make this one go away two different ways:
Workaround #1
def bar(self):
self.is_not_used()
doing_something_without_self()
def is_not_used(self):
pass
Workaround #2 [Thanks @DavidPärsson]
# noinspection PyMethodMayBeSt...
Why are there no ++ and -- operators in Python?
...ine.
It's not a decision of whether it makes sense, or whether it can be done--it does, and it can. It's a question of whether the benefit is worth adding to the core syntax of the language. Remember, this is four operators--postinc, postdec, preinc, predec, and each of these would need to have i...
“unrecognized selector sent to instance” error in Objective-C
...f the string it will not, and the receiver will get an error if it expects one. It is easy to miss the colon if you are dynamically creating the event name.
The receiver code options look like this:
- (void)doneBtnTui:(id)sender {
NSLog(@"Done Button - with sender");
}
or
- (void)doneBtnTui {
...
What is the garbage collector in Java?
... taken care of by the garbage collector, but in other languages such as C, one needs to perform memory management on their own using functions such as malloc and free. Memory management is one of those things which are easy to make mistakes, which can lead to what are called memory leaks -- places w...