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Possible reasons for timeout when trying to access EC2 instance
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Did you set an appropriate security group for the instance? I.e. one that allows access from your network to port 22 on the instance. (By default all traffic is disallowed.)
Update: Ok, not a security group issue. But does the problem persist if you launch up another instance from the sam...
Why do you need to put #!/bin/bash at the beginning of a script file?
...ly a convention, not a "rule". An executable can be a binary program, any one of a million script types and other things as well. Hence the need for #!/bin/bash.
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Defining a variable with or without export
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There's one edge-case to this; name=value command does make the variable available in the sub-process command.
– Oliver Charlesworth
Dec 23 '15 at 11:09
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How to convert JSON data into a Python object
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UPDATE
With Python3, you can do it in one line, using SimpleNamespace and object_hook:
import json
from types import SimpleNamespace
data = '{"name": "John Smith", "hometown": {"name": "New York", "id": 123}}'
# Parse JSON into an object with attributes corresp...
Should __init__() call the parent class's __init__()?
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If you need something from super's __init__ to be done in addition to what is being done in the current class's __init__, you must call it yourself, since that will not happen automatically. But if you don't need anything from super's __init__, no need to call it. Example:
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Multi-gradient shapes
...r stops, and the following float array defines where those stops are positioned (from 0 to 1). You can then, as stated, just use this as a standard Drawable.
Edit: Here's how you could use this in your scenario. Let's say you have a Button defined in XML like so:
<Button
android:id="@+id/th...
How do you design object oriented projects? [closed]
...d taking a course on object oriented design in Java. There is an excellent one published on UDEMY udemy.com/mastering-object-oriented-design-in-java/…. I think that can certainly help you. Another great resource is to try the ATM object oriented problem. You can google that.
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Why should eval be avoided in Bash, and what should I use instead?
...printf "$1\n" "${@:2}"
}
function error
{
# Send the first element as one argument, and the rest of the elements as a combined argument.
# Arguments to println:
# 1 -> '\e[31mError (%d): %s\e[m'
# 2 -> "$1"
# 3 -> "${*:2}"
println '\e[31mError (%d): %s\e[m' "...
What are the differences between B trees and B+ trees?
...es are linked, so doing a full scan of all objects in a tree requires just one linear pass through all the leaf nodes. A B tree, on the other hand, would require a traversal of every level in the tree. This full-tree traversal will likely involve more cache misses than the linear traversal of B+ lea...
How to make blinking/flashing text with CSS 3
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Just noticed that this, applied to one text element, consumes ridiculous amount of CPU on my computer using firefox. Beware.
– Alex
Sep 10 '14 at 9:00
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