In Python, Itertools is the inbuilt module that allows us to handle the iterators in an efficient way. They make iterating through the iterables like lists and strings very easily. One such itertools function is filterfalse().
Note: For more information, refer to Python Itertools
filterfalse() function
This iterator prints only values that return false for the passed function.
Syntax:
filterfalse(function or None, sequence) --> filterfalse object
Parameter: This method contains two arguments, the first argument is function or None and the second argument is list of integer.
Return Value: This method returns the only values that return false for the passed function.
Example 1:
# Python program to demonstrate # the working of filterfalse import itertools from itertools import filterfalse # function is a None for i in filterfalse(None, range(20)): print(i) li = [2, 4, 5, 7, 8, 10, 20] # Slicing the list print(list(itertools.filterfalse(None, li))) |
Output:
0 []
Example 2:
# Python program to demonstrate # the working of filterfalse import itertools from itertools import filterfalse def filterfalse(y): return (y > 5) li = [2, 4, 5, 7, 8, 10, 20] # Slicing the list print(list(itertools.filterfalse(filterfalse, li))) |
Output:
[2, 4, 5]
Example 3:
# Python program to demonstrate # the working of filterfalse import itertools from itertools import filterfalse li = [2, 4, 5, 7, 8, 10, 20] # Slicing the list print (list(itertools.filterfalse(lambda x : x % 2 == 0, li))) |
Output:
[5, 7]
