How to prevent the error "unable to allocate x.xx GiB for an array with shape (xx, xxx) and data type xxxxx" without restarting VS Code? Question: I am working with a lot of data in a jupyter notebook. From my research I understand that the memory (RAM/SWAP) is not sufficient to (temporarily) store my large …
Why garbage collection act weird this in Jupyter Notebook? Question: why second loop don’t print any thing?! z_rng = zip(range(10), range(10)) # this loop is run and print for i,j in z_rng: print(i,j) # this loop is not run and don’t print anything for l, k in z_rng: print(l, k) Or when print as list …
timeit and its default_timer completely disagree Question: I benchmarked these two functions (they unzip pairs back into source lists, came from here): n = 10**7 a = list(range(n)) b = list(range(n)) pairs = list(zip(a, b)) def f1(a, b, pairs): a[:], b[:] = zip(*pairs) def f2(a, b, pairs): for i, (a[i], b[i]) in enumerate(pairs): pass Results …
How to fully delete a turtle Question: I made a small tkinter game that uses turtle for graphics. It’s a simulation of the Triangle Peg Game from Cracker Barrel that is able to tell the player the next best move to make at any point in the game, among other features. Pegs are just instances …
PyQt – parent for widgets – necessary? Question: I tried creating GUI with a few widgets, all of them without secifying a parent. It worked fine. Is this Ok, or there is reason to specify the parent? Thanks! Asked By: Israel Unterman || Source Answers: In general, it’s better to specify a parent wherever possible, …
Why should you manually run a garbage collection in python? Question: I have occasionally come across code that manually calls gc.collect(), but it’s unclear why. For what reasons, if any, would it be advantageous to manually run a garbage collection, rather than let Python handle it automatically? Asked By: Brendan Abel || Source Answers: In …
Is there a need to delete a large variable in python immediately after its use? Question: If I create a list that’s 1 GB, print it to screen, then delete it, would it also be deleted from memory? Would this deletion essentially be like deallocating memory such as free() in C. If a variable is …
What does self = None do? Question: I’m reading the source code of the incoming asyncio package. Note that at the end of the method, there is a self = None statement. What does it do? def _run(self): try: self._callback(*self._args) except Exception as exc: msg = ‘Exception in callback {}{!r}’.format(self._callback, self._args) self._loop.call_exception_handler({ ‘message’: msg, ‘exception’: …
Why disable the garbage collector? Question: Pythons gc.disable disables automatic garbage collection. As I understand it, that would have quite some side-effects. Why would anyone want to disable automatic garbage collection, and how could one effectively manage memory without it? Asked By: gerrit || Source Answers: One use for disabling the garbage collector is to …
Find all references to an object in python Question: What is a good way to find all of the references to an object in python? The reason I ask is that it looks like we have a “memory leak”. We are uploading image files to the server from a web browser. Each time we do …
