Python filter () function

The filter () function filters the sequence, filters out elements that are not eligible, returns an iterator object , and, if you want to convert to a list, you can use list () to convert.

The two parameters are received, the first is a function, the second is a sequence, each element of the sequence is passed as a parameter to the function, and then returns True or False, and finally the element that returns true is placed in the new list.

Filter(function, iterable)

• Beauty /' f?lt?/

  N. filters; [chemical] filters; filter; filters; optical Filters

  Vt. to remove by filtration;

Parameters

• Function-------judging functions.
• Iterable--Can iterate over objects.

return value

Returns an Iterator object

# 2. Use the filter function to process the list of numbers and filter out all the even number in the list num = [1,3,5,6,7,8]def  Choice (x):    if x%2 = = 0        :return= filter (choice,num)print(list ( ret))print(list (filter (lambda x:x%2==0,num)))

Python filter () function