This content originally appeared on flaviocopes.com and was authored by flaviocopes.com
Python provides 3 useful global functions we can use to work with collections: map(), filter() and reduce().
Tip: sometimes list comprehensions make more sense and are generally considered more pythonic
filter(), as map, creates a new list from an iterable. Using a function you can choose to eliminate (filter) some of the original items.
You do so by returning True or False from the filtering function:
numbers = [1, 2, 3]
def isEven(n):
return n % 2 == 0
result = filter(isEven, numbers)
print(list(result)) # [2]You can use a lambda function to make the code more concise:
numbers = [1, 2, 3]
result = filter(lambda n: n % 2 == 0, numbers)
print(list(result)) # [2]
This content originally appeared on flaviocopes.com and was authored by flaviocopes.com
flaviocopes.com | Sciencx (2021-02-27T05:00:00+00:00) How to use Python filter(). Retrieved from https://www.scien.cx/2021/02/27/how-to-use-python-filter/
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