n00b question on spacing

[Terry Reedy]

On 6/21/2013 5:17 PM, Yves S. Garret wrote:
> Hi, I have a question about breaking up really long lines of code in Python.
>
> I have the following line of code:
> log.msg("Item wrote to MongoDB database %s/%s" %(settings['MONGODB_DB'],
> settings['MONGODB_COLLECTION']), level=log.DEBUG, spider=spider)
>
> Given the fact that it goes off very far to the right on my screen is
> not terribly
> pleasing to my eyes (and can be rude for other developers).
>
> I was thinking of splitting it up like so:
> log.msg("Item wrote to MongoDB database %s/%s"
>    %(settings['MONGODB_DB'], settings['MONGODB_COLLECTION']),
>    level=log.DEBUG, spider=spider)
>
> Is this ok?  Are there any rules in Python when it comes to breaking up
> long lines of code?

For function calls, PEP8 suggests either an extra indent or line up as 
follows.
log.msg("Item wrote to MongoDB database %s/%s"
         %(settings['MONGODB_DB'], settings['MONGODB_COLLECTION']),
         level=log.DEBUG, spider=spider)

The point is to not look like a normal indent to clue reader that these 
are continuation lines and not new statements.

-- 
Terry Jan Reedy