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The filter () method (filter):

The filter () function is used to filter sequences, filter out elements that do not meet the criteria, and return a new list of eligible elements.

This takes two parameters, the first is a function, the second is a sequence, each element of the sequence is passed as a parameter to the function for judgment, then returns True or False, and finally puts the element that returns True into the new list.

Note: Pyhton2.7 returns a list, Python3.x returns an iterator object, which can be cast to list type

Example 1

Def is_odd (n): return n% 2 = = 1 newlist = filter (is_odd, [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]) print (newlist) output result: [1,3,5,7,9]

Example 2

Python3: a = filter (lambda x: X% 2 = = 0, range (10)) print (list (a)) output [0,2,4,6,8] is all the content of this article "what is the use of the filter () method in python". Thank you for reading! I believe we all have a certain understanding, hope to share the content to help you, if you want to learn more knowledge, welcome to follow the industry information channel!

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