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Python: Get the first character of the first string in a list?
...hings up for me:
"Losing your Loops, Fast Numerical Computing with NumPy" by PyCon 2015:
https://youtu.be/EEUXKG97YRw?t=22m22s
"NumPy Beginner | SciPy 2016 Tutorial" by Alexandre Chabot LeClerc:
https://youtu.be/gtejJ3RCddE?t=1h24m54s
...
Python syntax for “if a or b or c but not all of them”
...
Which translates the title of your question.
UPDATE: as correctly said by Volatility and Supr, you can apply De Morgan's law and obtain equivalent:
if (a or b or c) and not (a and b and c):
My advice is to use whichever form is more significant to you and to other programmers. The first means...
Cannot ignore .idea/workspace.xml - keeps popping up
... ALREADY commited into the repo previously, and so they were being tracked by git regardless of whether you ignored them or not. I would recommend the following, after closing RubyMine/IntelliJ or whatever IDE you are using:
mv .idea ../.idea_backup
rm .idea # in case you forgot to close your IDE
g...
Disable building workspace process in Eclipse
... and cancel.
When a build is cancelled, it typically handles this by discarding incremental build state and letting the next build be a full rebuild. This can be quite expensive in some projects.
As a user I think I would rather wait for the 5 second incremental build to finish rather tha...
Android on-screen keyboard auto popping up
...has an "opening screen" (basically a menu) that has an EditText followed by several Button s. The problem is that several of my users are reporting that when they open the app it's automatically popping up the on-screen keyboard without them even touching the EditText . As far as I can tell, all...
Save modifications in place with awk
...ction will truncate the file to zero size (redirecting output). Therefore, by the time someprocess gets launched and wants to read from the file, there is no data for it to read.
share
|
improve thi...
What resources are shared between threads?
...om section 2.2.2 The Classical Thread Model in Modern Operating Systems 3e by Tanenbaum:
The process model is based on two independent concepts: resource
grouping and execution. Sometimes it is useful to separate them;
this is where threads come in....
He continues:
One way of looki...
How many and which are the uses of “const” in C++?
... can't change
double const PI = 3.1415;
For passing arbitrary objects by reference instead of by value - to prevent possibly expensive or impossible by-value passing
void PrintIt(Object const& obj) {
// ...
}
...
Data structure: insert, remove, contains, get random element, all at O(1)
...he value to be removed. Set A[i]=d, H[d]=i, decrease the size of the array by one, and remove value from H.
contains(value): return H.contains(value)
getRandomElement(): let r=random(current size of A). return A[r].
since the array needs to auto-increase in size, it's going to be amortize O(1) to ...
How to initialise memory with new operator in C++?
...
It's a surprisingly little-known feature of C++ (as evidenced by the fact that no-one has given this as an answer yet), but it actually has special syntax for value-initializing an array:
new int[10]();
Note that you must use the empty parentheses — you cannot, for example, use (0) o...