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When to use cla(), clf() or close() for clearing a plot in matplotlib?
...a figure which may consist of many axes. Additionally, there are functions from the pyplot interface and there are methods on the Figure class. I will discuss both cases below.
pyplot interface
pyplot is a module that collects a couple of functions that allow matplotlib to be used in a functional ...
How to unit test a Node.js module that requires other modules and how to mock the global require fun
...lace all imports/requires of "firebase-admin" with the object you returned from that "factory"-function.
Well, you can do that when using jest because jest creates a runtime around every module it runs and injects a "hooked" version of require into the module, but you wouldn't be able to do this wi...
URL-parameters and logic in Django class-based views (TemplateView)
...he context. This variable points at your view object.
In your views.py:
from django.views.generic.base import TemplateView
class Yearly(TemplateView):
template_name = "calendars/yearly.html"
# Not here
current_year = datetime.datetime.now().year
current_month = datetime.date...
Why do objects of the same class have access to each other's private data?
...:f(Y& y), because our concrete object could be of type Z that inherits from both X and Y. In short it's a real mess, not performant, hard to make work sensibly with MI.
– Nir Friedman
Apr 4 '17 at 16:35
...
Is there a Java equivalent or methodology for the typedef keyword in C++?
Coming from a C and C++ background, I found judicious use of typedef to be incredibly helpful. Do you know of a way to achieve similar functionality in Java, whether that be a Java mechanism, pattern, or some other effective way you have used?
...
What are the -Xms and -Xmx parameters when starting JVM?
...the JVM can/will use more memory than just the size allocated to the heap. From Oracle's documentation:
Note that the JVM uses more memory than just the heap. For example Java methods, thread stacks and native handles are allocated in memory separate from the heap, as well as JVM internal data s...
Print a string as hex bytes?
...somehow.
If your terminal doesn't accept these characters, you can decode from UTF-8 or use the names (so you can paste and run the code along with me):
a_string = (
"\N{CYRILLIC CAPITAL LETTER PE}"
"\N{CYRILLIC SMALL LETTER ER}"
"\N{CYRILLIC SMALL LETTER I}"
"\N{CYRILLIC SMALL LET...
Preloading images with jQuery
...
From my experience, preloading an image into the DOM makes the browser aware of its existence and for it to be properly cached. Otherwise, the image only exists in memory which only works for single page apps.
...
Does the 'mutable' keyword have any purpose other than allowing the variable to be modified by a con
...nly bitwise const and the 'mutable' keyword can be used to exclude members from this checking. It is not possible to achieve 'logical' const in C++ other than via abstractions (eg. SmartPtrs).
– Richard Corden
Sep 22 '08 at 8:13
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C# difference between == and Equals()
...ject, then both will return true, but if one has the same content and came from a different source (is a separate instance with the same data), only Equals will return true. However, as noted in the comments, string is a special case because it overrides the == operator so that when dealing purely w...