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fatal error: Python.h: No such file or directory
...like you haven't properly installed the header files and static libraries for python dev. Use your package manager to install them system-wide.
For apt (Ubuntu, Debian...):
sudo apt-get install python-dev # for python2.x installs
sudo apt-get install python3-dev # for python3.x installs
Fo...
What's a good rate limiting algorithm?
I could use some pseudo-code, or better, Python. I am trying to implement a rate-limiting queue for a Python IRC bot, and it partially works, but if someone triggers less messages than the limit (e.g., rate limit is 5 messages per 8 seconds, and the person triggers only 4), and the next trigger is ...
How do I sort an array of hashes by a value in the hash?
...
Ruby's sort doesn't sort in-place. (Do you have a Python background, perhaps?)
Ruby has sort! for in-place sorting, but there's no in-place variant for sort_by in Ruby 1.8. In practice, you can do:
sorted = sort_me.sort_by { |k| k["v...
swift case falling through
...default:
result = 3
}
Alternatively, you can use the fallthrough keyword:
var testVal = "hello"
var result = 0
switch testVal {
case "one":
fallthrough
case "two":
result = 1
default:
result = 3
}
share
...
How do I return early from a rake task?
...
A Rake task is basically a block. A block, except lambdas, doesn't support return but you can skip to the next statement using next which in a rake task has the same effect of using return in a method.
task :foo do
puts "printed"
next
puts "never printed"
end
Or you can move the code in...
How do I use spaces in the Command Prompt?
...mmand had to be enclosed again by another pair of quotation marks. Now it works! Thanks!
– Arise
May 30 '13 at 6:36
@s...
JSON, REST, SOAP, WSDL, and SOA: How do they all link together
... the functionality from the presentation of the application, because it affords greater freedom.
You create an API and let others implement their own front-ends over it as well. What you just did here is implement an SOA methodology, i.e. using web-services.
Web services make functional build...
Can I get git to tell me all the files one user has modified?
...
This isn't the only way, but it works:
git log --pretty="%H" --author="authorname" |
while read commit_hash
do
git show --oneline --name-only $commit_hash | tail -n+2
done | sort | uniq
Or, as one line:
git log --pretty="%H" --author=...
How to do the equivalent of pass by reference for primitives in Java
...at it reads, toyNumber = temp.play(toyNumber);.
Choice 3: make it a class or static variable
If the two functions are methods on the same class or class instance, you could convert toyNumber into a class member variable.
Choice 4: Create a single element array of type int and pass that
This is c...
Hidden Features of Java
...surprise a few months ago when I first discovered it, never heard of it before.
ThreadLocals are typically not so widely known as a way to store per-thread state.
Since JDK 1.5 Java has had extremely well implemented and robust concurrency tools beyond just locks, they live in java.util.concurrent...