Troubleshooting Python

If you are unfamiliar with Python, here are some guidelines.

• In Python, (, {, and [ each have different meanings. Be careful to use the correct type of ``parentheses''.
• Be careful about whether the name has a single underscore, e.g. _one, versus two leading underscores, e.g. __two. These can look similar in our documentation, so look carefully.
• In Python, words that have two double-underscores before and after the word, e.g. __init__ or __path__, generally denote ``special'' symbols.
• A command can be split over multiple lines. Normally, the Python continuation symbol ` $\backslash$' at the end of each non-finished line is required. There is one exception: expressions in parentheses, straight brackets, or curly braces do not need ' $\backslash$'.
• Indentation matters in Python. Code blocks (except of expressions in parentheses, straight brackets, or curly braces) are defined by their indentation.