I like to have the flexibility to indent in whatever style the code calls for. That said, looking over the Python docs again, their implementation of significant whitespace is a lot more flexible than I remembered. I didn't realize you could do one-line method definitions, and that the whitespace only kicks in when you write a multi-line block.

Here's a question for you. In Python, if you have a couple of nested lambdas with multiline bodies, getting passed into each other as arguments, do you have to write the closing parenthesis on the correctly-indented line on the other side, or can it be tucked against the inner lambda?

In a hypothetical significant-whitespace CoffeeScript, I'm thinking of this:

    elements.each(el =>
      el.click(event =>
        el.show()))

Versus this:

    elements.each(el =>
      el.click(event =>
        el.show()
      )
    )

Is the second form required to make Python-style whitespace work?