Python 3.4: adding value to list if condition exists

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i have a scenario like this one:

mainList = [[9,5],[17,3],[23,1],[9,2]]
secondaryList = [9,12,28,23,1,6,95]
myNewList = []

myNewList.append([[a,b] for a,b in mainList if a in secondaryList])

this, return me to me:

myNewList = [[9,5],[23,1],[9,2]]

but I need only the first occourance of "a". In other words I need to obtain:

myNewList = [[9,5],[23,1]]

How can I achieve this?

asked 36 secs ago

jul

62

Python 3.4: adding value to list if condition exists