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Install a module using pip for specific python version
...hen I have installed Python 2.7. How can I use pip install to install packages for Python 2.7.
14 Answers
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Signtool error: No certificates were found that met all given criteria with a Windows Store App?
I'm trying to sign a Windows 8 appx package with a pfx file I have. I'm using a command like so:
19 Answers
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What is tail call optimization?
...Tail-call optimization is where you are able to avoid allocating a new stack frame for a function because the calling function will simply return the value that it gets from the called function. The most common use is tail-recursion, where a recursive function written to take advantage of tail-call ...
onSaveInstanceState () and onRestoreInstanceState ()
... From B you call startActivity(A). Then from A you call finish() to get back to B. Right? In that case Your first activity, B will not have been destroyed, and neither onCreate() nor onRestoreInstanceState() will be called. These methods are only called when needed, that is when an activity has been...
PHP - how to create a newline character?
...ely, so you want:
"\r\n"
Single quoted strings, on the other hand, only know the escape sequences \\ and \'.
So unless you concatenate the single quoted string with a line break generated elsewhere (e. g., using double quoted string "\r\n" or using chr function chr(0x0D).chr(0x0A)), the only oth...
Eclipse error: 'Failed to create the Java Virtual Machine'
...
Try removing the -vm P:\Programs\jdk1.6\bin lines.
Also, a general recommendation: set -Dosgi.requiredJavaVersion=1.6, not 1.5.
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Set cURL to use local virtual hosts
....com:80:127.0.0.1' http://yada.com/something
What's the difference, you ask?
Among others, this works with HTTPS. Assuming your local server has a certificate for yada.com, the first example above will fail because the yada.com certificate doesn't match the 127.0.0.1 hostname in the URL.
The sec...
Using Regular Expressions to Extract a Value in Java
... System.out.println(m.group(1)); // first expression from round brackets (Testing)
System.out.println(m.group(2)); // second one (123)
System.out.println(m.group(3)); // third one (Testing)
}
}
Since you're looking for the first number, you can use such regexp:
^\D+(\d+...
How can I add a column that doesn't allow nulls in a Postgresql database?
...COLUMN mycolumn character varying(50) NOT NULL DEFAULT 'foo';
... some work (set real values as you want)...
ALTER TABLE mytable ALTER COLUMN mycolumn DROP DEFAULT;
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How to define custom exception class in Java, the easiest way?
...you don't "inherit" non-default constructors, you need to define the one taking a String in your class. Typically you use super(message) in your constructor to invoke your parent constructor. For example, like this:
public class MyException extends Exception {
public MyException(String message)...