[Python-Dev] Suggested addition to PEP 8 for context managers (original) (raw)

Guido van Rossum guido at python.org
Tue Apr 17 16:21:46 CEST 2012

On Tue, Apr 17, 2012 at 12:14 AM, Paul Moore <p.f.moore at gmail.com> wrote:

On 16 April 2012 17:10, Nam Nguyen <bitsink at gmail.com> wrote:

PEP 8 suggests no extra spaces after and before square brackets, and colons. So code like this is appropriate:

alist[1:3] But I find it less readable in the case of: alist[pos + 1:-1] The colon is seemingly lost in the right. Would it be better to read like below? alist[pos + 1 : -1] Any opinion? It says no space before a colon, not after. So the following should be OK (and is what I'd use): alist[pos + 1: -1]

I hope that's now what it says about slices -- that was meant for dict displays. For slices it should be symmetrical. In this case I would remove the spaces around the +, but it's okay to add spaces around the : too. It does look odd to have an operator that binds tighter (the +) surrounded by spaces while the operator that binds less tight (:) is not. (And in this context, : should be considered an operator.)

-- --Guido van Rossum (python.org/~guido)

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