Below is some python code to loop over a list of lists and return some output. In this case we have 2 lists of websites and want to return some KPIs - page views, unique visitors, and engagement (page views/visitor) - at the list level.

[sourcecode language="python"]

define a procedure, called traffic, that takes as input

a list and returns as output three numbers providing the

total number of page views, unique visitors

and page views per visitor.

For now we will not worry about sig figs.

list_1 = [['site',4500,25000]]

list_2 = [ ['site1',2175,37704], ['site2',19627,39849], ['site3',10566,40732], ['site4',7802,37000], ['site5',5879,35551], ['site6',19535,40569], ['site7',11701,40500]  ]

def total_traffic(p): total_unique_visitors = 0 total_page_views = 0 for site, unique_visitors, page_views in p: total_unique_visitors = total_unique_visitors + unique_visitors total_page_views = total_page_views + page_views pv_uv = total_page_views / total_unique_visitors return total_unique_visitors, total_page_views, pv_uv

print total_traffic(list_1) #>>> (4500, 25000, 5) print total_traffic(list_2) #>>> (77285, 271905, 3) [/sourcecode]