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(python2.1-tut.info)Line Editing

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Line Editing
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If supported, input line editing is active whenever the interpreter
prints a primary or secondary prompt.  The current line can be edited
using the conventional Emacs control characters.  The most important of
these are: <C-A> (Control-A) moves the cursor to the beginning of the
line, <C-E> to the end, <C-B> moves it one position to the left, <C-F>
to the right.  Backspace erases the character to the left of the
cursor, <C-D> the character to its right.  <C-K> kills (erases) the
rest of the line to the right of the cursor, <C-Y> yanks back the last
killed string.  <C-underscore> undoes the last change you made; it can
be repeated for cumulative effect.