PEP-8 recommends you indent lines to the opening parentheses if you put anything on the first line, so it should either be indenting to the opening bracket:
urlpatterns = patterns('',
url(r'^$', listing, name="investment-listing"))
or not putting any arguments on the starting line, then indenting to a uniform level:
urlpatterns = patterns(
'',
url(r'^$', listing, name="investment-listing"),
)
urlpatterns = patterns(
'', url(r'^$', listing, name="investment-listing"))
I suggest taking a read through PEP-8 – you can skim through a lot of it, and it’s pretty easy to understand, unlike some of the more technical PEPs.