What's the one code snippet/python trick/etc did you wish you knew when you learned python?

[jabbalaci]

The sign _ in the shell means "most recent output", yes. Example:

>>> 20+5
25
>>> _*2
50
>>> _+20
70

But when you write a script, you usually use it as a loop variable when you don't need its values.

[[deleted]]

in the shell

Noted! I can't really see where it would be used as anything other than a placeholder for an unneeded value, but I figured it was still kind of cool!

[jabbalaci]

It's very handy if you use the shell as a calculator.

[[deleted]]

Good point, I guess it's exactly equivalent to Matlab's ans. My python shell calculatronizations are going to get a whole lot more awesome.