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How can I check whether a numpy array is empty or not?
...an always take a look at the .size attribute. It is defined as an integer, and is zero (0) when there are no elements in the array:
import numpy as np
a = np.array([])
if a.size == 0:
# Do something when `a` is empty
...
Why does modern Perl avoid UTF-8 by default?
...riable to AS. This makes all Perl scripts decode @ARGV as UTF‑8 strings, and sets the encoding of all three of stdin, stdout, and stderr to UTF‑8. Both these are global effects, not lexical ones.
At the top of your source file (program, module, library, dohickey), prominently assert that you are...
RESTful URL design for search
...edan&doors=4
An advantage to regular querystrings is that they are standard and widely understood and that they can be generated from form-get.
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Should URL be case sensitive?
...
According to W3's "HTML and URLs" they should:
There may be URLs, or parts of URLs, where case doesn't matter, but
identifying these may not be easy. Users should always consider that
URLs are case-sensitive.
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python setup.py uninstall
...setup.py install use pip install .
You need to remove all files manually, and also undo any other stuff that installation did manually.
If you don't know the list of all files, you can reinstall it with the --record option, and take a look at the list this produces.
To record a list of installed ...
Why does a return in `finally` override `try`?
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@Castrohenge - it's not a hard and fast rule, but most of the copunter-examples in that thread are pretty contrived, and the only valid case I see is the "guard clause" (essentially the pattern of checking input data at the top of the function and returnin...
Can a CSS class inherit one or more other classes?
I feel dumb for having been a web programmer for so long and not knowing the answer to this question, I actually hope it's possible and I just didn't know about rather than what I think is the answer (which is that it's not possible).
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Android onCreate or onStartCommand for starting service
Usually when I create an Android service I implement the onCreate method, but in my last project this does not work. I tried implementing onStartCommand , and this seems to work.
...
To ARC or not to ARC? What are the pros and cons? [closed]
...ge collection. It has no GC runtime overhead. The compiler inserts retains and releases in all the places you should have anyway. But it's smarter than you and can optimize out the ones that aren't actually needed (just like it can unroll loops, eliminate temporary variables, inline functions, etc.)...
Get size of folder or file
...using the listFiles() method of a file object that represents a directory) and accumulate the directory size for yourself:
public static long folderSize(File directory) {
long length = 0;
for (File file : directory.listFiles()) {
if (file.isFile())
length += file.length(...