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MySql server startup error 'The server quit without updating PID file '
...", there should be more info. It might be in:
/usr/local/var/mysql/your_computer_name.local.err
It's probably problem with permissions
check if any mysql instance is running
ps -ef | grep mysql
if yes, you should stop it, or kill the process
kill -9 PID
where PID is the number d...
AttributeError: 'module' object has no attribute 'urlopen'
...
A Python 2+3 compatible solution is:
import sys
if sys.version_info[0] == 3:
from urllib.request import urlopen
else:
# Not Python 3 - today, it is most likely to be Python 2
# But note that this might need an update when Python 4
# might be around one day
from urlli...
Automatically add newline at end of curl response body
...ther with some text and an
ending newline:
curl -w 'We downloaded %{size_download} bytes\n' www.download.com
So try adding the following to your ~/.curlrc file:
-w "\n"
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How to pass command line arguments to a rake task
... symbol arguments to the task call. For example:
require 'rake'
task :my_task, [:arg1, :arg2] do |t, args|
puts "Args were: #{args} of class #{args.class}"
puts "arg1 was: '#{args[:arg1]}' of class #{args[:arg1].class}"
puts "arg2 was: '#{args[:arg2]}' of class #{args[:arg2].class}"
end
ta...
Polymorphism in C++
...rtual Base& operator+=(int) = 0; };
struct X : Base
{
X(int n) : n_(n) { }
X& operator+=(int n) { n_ += n; return *this; }
int n_;
};
struct Y : Base
{
Y(double n) : n_(n) { }
Y& operator+=(int n) { n_ += n; return *this; }
double n_;
};
void f(Base& x) { x...
Pick a random element from an array
...array = ["Frodo", "sam", "wise", "gamgee"]
let randomIndex = Int(arc4random_uniform(UInt32(array.count)))
print(array[randomIndex])
The castings are ugly, but I believe they're required unless someone else has another way.
...
Binding an enum to a WinForms combo box, and then setting it
... in mind the tryparse is a .net 4.0 statement.
– real_yggdrasil
Jun 22 '12 at 7:53
For me SelectedValue is always null...
Meaning of 'const' last in a function declaration of a class?
...e that is often broken and easily broken.
foobar& fbNonConst = const_cast<foobar&>(fb1);
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How to check Django version
... is as an executable command:
$ python -c "import django; print(django.get_version())"
2.0
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Apply function to all elements of collection through LINQ [duplicate]
...answered May 31 '14 at 4:47
Jack_2060Jack_2060
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