Conventions used

There are a number of text conventions used throughout this book.

Code in text: Indicates that words in text are not plain English words, but are words belonging to a program.

The break instruction breaks out of the while loop (that is, execution continues beyond the end of the loop - it’s a sort of short-circuit mechanism).

In order to draw your attention to features in code, we sometimes use bold font or shading to highlight features. Consider the following example:

The text following # is in a non-monospaced font and is a comment ignored by the computer:

for i in range (0,6):         # Repeat six times