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The filter function is similar to the map function. They both make use of a function and and a list. The filter function will pass every element of the given list into a function that returns a Boolean value. If the function returns True for a given element that element will be added to the new returned list. Otherwise it will not.
def isAOne(x): return x == 1 nums = [1,1,6,7,8,0,1,1] newList = list(filter(isAOne,nums)) # newList is [1,1,1,1]