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What is a callback function?
What is a callback function?
21 Answers
21
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Format a Go string without printing?
...
Sprintf is what you are looking for.
Example
fmt.Sprintf("foo: %s", bar)
You can also see it in use in the Errors example as part of "A Tour of Go."
return fmt.Sprintf("at %v, %s", e.When, e.What)
...
Python Infinity - Any caveats?
...involving inf:
>>> 0 * float("inf")
nan
Note that you will normally not get an inf value through usual arithmetic calculations:
>>> 2.0**2
4.0
>>> _**2
16.0
>>> _**2
256.0
>>> _**2
65536.0
>>> _**2
4294967296.0
>>> _**2
1.84467440737...
Using module 'subprocess' with timeout
...nux) in the context of an Apache module (like mod_python, mod_perl, or mod_php), I've found the use of signals and alarms to be disallowed (presumably because they interfere with Apache's own IPC logic). So to achieve the goal of timing out a command I have been forced to write "parent loops" which ...
How to get the process ID to kill a nohup process?
...ng nohup and you put the task in the background, the background operator (&) will give you the PID at the command prompt. If your plan is to manually manage the process, you can save that PID and use it later to kill the process if needed, via kill PID or kill -9 PID (if you need to force kill)....
Different bash prompt for different vi editing mode?
...#########
# FOR MORE INFORMATION CHECK:
# https://wiki.archlinux.org/index.php/Readline
# TURN ON VIM (E.G. FOR READLINE)
set editing-mode vi
# SHOW THE VIM MODE IN THE PROMPT (COMMAND OR INSERT)
set show-mode-in-prompt on
# SET THE MODE STRING AND CURSOR TO INDICATE THE VIM MODE
# FOR THE NUMB...
PHP regular expressions: No ending delimiter '^' found in
...
PHP regex strings need delimiters. Try:
$numpattern="/^([0-9]+)$/";
Also, note that you have a lower case o, not a zero. In addition, if you're just validating, you don't need the capturing group, and can simplify the rege...
Command line to remove an environment variable from the OS level configuration
...ext cmd shell) and then remove it from the registry, e.g.: SETX FOOBAR "" & REG delete HKCU\Environment /F /V FOOBAR
– Luke
Aug 4 '17 at 17:02
1
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Converting Mercurial folder to a Git repository
...ocal repository or a remote repository accessed via SSH, HTTP or HTTPS.
Example of local repositories conversion.
Install Hg-Git.
On Windows, TortoiseHg comes with Hg-Git, though you need to enable it via the setting tool (in extensions section)
or manually in ~/mercurial.ini
[extensions]
h...
How to generate JAXB classes from XSD?
...ncluded in the bin directory in the JDK starting with Java SE 6. For an example see:
http://blog.bdoughan.com/2010/09/processing-atom-feeds-with-jaxb.html
The contents of the blog are the following:
Processing Atom Feeds with JAXB
Atom is an XML format for representing web feeds. A standard f...