## Filter Function
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.
```python
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]
```

Optional Parameters

Static & Class Methods

Map() Function

Filter() Function

Lambda Functions

Collections/Counter()

Collections/namedtuple()

Collections/Deque(deck)

This intermediate python tutorial covers the filter function in python. The filter function is useful for operations on lists.

Filter() Function

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Filter Function