On Mon, Aug 3, 2015 at 1:37 AM, Eric V. Smith <eric@trueblade.com> wrote:
There's currently no way around this. You could try putting a space between the left braces, but that fails with IndentationError:
f'expr={ {x: y for x, y in [(1, 2), (3, 4)]}}' File "<fstring>", line 1 {x: y for x, y in [(1, 2), (3, 4)]} ^ IndentationError: unexpected indent
In the PEP I'm going to specify that leading spaces are skipped in an expression. So that last example will now work:
f'expr={ {x: y for x, y in [(1, 2), (3, 4)]}}' 'expr={1: 2, 3: 4}'
Note that the right braces in that last example aren't interpreted as a doubled '}'. That's because the first one is part of the expression, and the second one ends the expression. The only time doubling braces matters is inside the string literal portion of an f-string.
Sounds good. And even though your }} is perfectly valid, I'd recommend people use spaces at both ends:
f'expr={ {x: y for x, y in [(1, 2), (3, 4)]} }' 'expr={1: 2, 3: 4}'
which presumably would be valid too. It's a narrow enough case (expressions beginning or ending with a brace) that the extra spaces won't be a big deal IMO. ChrisA