Python3.2 vertical chaining

Question

In Python3.2 I can do this:

foo = Bar()
foo.setSomething(something1).setStatus('horizontal').setAttributes(attributes)

Eventually the chain becomes pretty long. I have an itch for a vertical chaining.

foo = Bar()
foo.setSomething(something1)
   .setStatus('vertical')
   .setAttributes(attributes)

Is there any way to do that?

http://stackoverflow.com/questions/2550439/correct-way-to-put-long-function-calls-on-multiple-lines — sean, Dec 03 '12 at 14:52
http://stackoverflow.com/questions/53162/how-can-i-do-a-line-break-line-continuation-in-python — asheeshr, Dec 03 '12 at 15:03
Thank you guys for links. Could not find any of these questions since I was looking by keyword "chaining" :) — nkamm, Dec 03 '12 at 15:08

score 2 · Accepted Answer · answered Dec 03 '12 at 14:53

2

Just enclose your expression in parenthesis:

foo = Bar()
(foo.setSomething(something1)
     .setStatus('vertical')
     .setAttributes(attributes))

answered Dec 03 '12 at 14:53

Krotton

score 2 · Answer 2 · edited May 23 '17 at 11:48

Thank you @Krotton for the answer it works indeed. Also thanks to @sean for the link. So, the correct way to use vertical chaining is:

foo = Bar()
(foo.setSomething(something1)
     .setStatus('vertical')
     .setAttributes(attributes))

You also may use the syntax, like with multi-line strings, to allow vertical chaining:

foo = Bar()
foo.setSomething(something1)\
   .setStatus('vertical')\
   .setAttributes(attributes)

2 Answers2