The *body* of the loop is *indented*: indentation is Python's way of grouping statements.At the interactive prompt, you have to type a tab or space(s) for each indented line.In practice you will prepare more complicated input for Python with a text editor; all decent text editors have an auto-indent facility.When a compound statement is entered interactively, it must be followed by a blank line to indicate completion (since the parser cannot guess when you have typed the last line).Note that each line within a basic block must be indented by the same amount.