http://sscce.org/
If you are having a problem with some code and seeking help, preparing a Short, Self Contained, Correct Example (SSCCE) is very useful. But what is an SSCCE?

It is all in the name, really. Take a look at each part. The version you prepare for others to see should be:

• Short (Small) - Minimise bandwidth for your example, do not bore the audience.
• Self Contained - Ensure everything is included, ready to go.
• Correct - Copy, paste, (compile,) see is the aim.
• Example - Displays the problem you are trying to solve.

Commonly asked questions:
- "Least Astonishment" in Python: The Mutable Default Argument
- Unexpected feature in a Python list of lists
- How to prevent SQL injection in PHP?