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How can I select random files from a directory in bash?
...a script that uses GNU sort's random option:
ls |sort -R |tail -$N |while read file; do
# Something involving $file, or you can leave
# off the while to just get the filenames
done
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What is the use of “assert” in Python?
I have been reading some source code and in several places I have seen the usage of assert .
21 Answers
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Find location of a removable SD card
... scan additional SD cards and add them to the media provider and give apps read-only access to their files (which is also still supported in the platform today).
Android 4.4 is the first release of the platform that has actually allowed applications to use SD cards for storage. Any access to them p...
Guava equivalent for IOUtils.toString(InputStream)
Apache Commons IO has a nice convenience method IOUtils.toString() to read an InputStream to a String.
9 Answers
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What exactly is OAuth (Open Authorization)?
...tion) access to their information (e.g. the list of your friends).
If you read it stated as plainly, I would understand your confusion. So let's go with a concrete example: joining yet another social network!
Say you have an existing GMail account. You decide to join LinkedIn. Adding all of your m...
What database does Google use?
...s about 100 tablets. This setup allows tablets from a single table to be spread among many servers. It also allows for fine-grained load balancing. If one table is receiving many queries, it can shed other tablets or move the busy table to another machine that is not so busy. Also, if a machine goes...
Is String.Contains() faster than String.IndexOf()?
... about are minute - the point is one calls the other, and Contains is more readable if you don't need the index. In other words don't worry about it.
– Chris S
Nov 15 '15 at 18:17
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How to remove/change JQuery UI Autocomplete Helper text?
... As you said, it's used for accessibility so people with screen readers can understand the widget better. By using display: none; you hide it from screen readers as well. Better to move it of screen with position: absolte; left:-999em;
– Daniel Göransson
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builtins.TypeError: must be str, not bytes
...ary file to base64 & vice versa. Prove in python 3.5.2
import base64
read_file = open('/tmp/newgalax.png', 'rb')
data = read_file.read()
b64 = base64.b64encode(data)
print (b64)
# Save file
decode_b64 = base64.b64decode(b64)
out_file = open('/tmp/out_newgalax.png', 'wb')
out_file.write(deco...
Difference between static class and singleton pattern?
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What makes you say that either a singleton or a static method isn't thread-safe? Usually both should be implemented to be thread-safe.
The big difference between a singleton and a bunch of static methods is that singletons can implement interfaces (or derive from useful base classes, although ...