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[QUOTE="Steven D'Aprano, post: 5060000"]
This only works if you are running a Linux or Unix shell with the
libreadline library installed. This should work on nearly any modern
Linux system with the bash shell. I don't know about other shells.

On Mac OS, the relevant library is called libedit instead, and the
details may be different.

On Windows, you're out of luck.

Anyway, using Linux and bash: at the shell, if I type Ctrl-U, that is
interpreted by the shell to mean "clear the line currently being edited".
So if I type Ctrl-U, the line is cleared.

But if I type Ctrl-Q first, then Ctrl-U, instead readline enters a
literal ^U character (ASCII value 0x15 = NAK Negative AcKnowledgment)
into the line editing buffer.

The same trick should work in the Python interactive editor:
21

Note that this may or may not work in IDEs such as IDLE. Many IDEs do
their own thing for editing, and there's no guarantee they will support
this functionality.

One last comment: readline is very configurable, and the command to
insert the next character could be just about anything. But Ctrl-Q is the
standard.
[/QUOTE]

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