Python - Itertools.filterfalse()

Python – Itertools.dropwhile()

Last Updated : 19 Feb, 2020

Itertools is a Python module that provide various functions that work on iterators to produce complex iterators. It makes the code faster, memory efficient and thus we see a better performance. This module is either used by themselves or in combination to form iterator algebra.

Note: For more information, refer to Python Itertools

Dropwhile()

The dropwhile() function of Python returns an iterator only after the func. in argument returns false for the first time.

Syntax:

dropwhile(func, seq):

Example 1:

# Python code to demonstrate the working of    
# dropwhile()  
  
  
# Function to be passed 
# as an argument 
def is_positive(n): 
    return n > 0 
  
value_list =[5, 6, -8, -4, 2] 
result = list(itertools.dropwhile(is_positive, value_list))  
   
print(result)  

Output:

[-8, -4, 2]

Example 2:

# Python code to demonstrate the working of    
# dropwhile()  
    
    
import itertools  
    
    
# initializing list    
li = [2, 4, 5, 7, 8]   
      
# using dropwhile() to start displaying after condition is false   
print ("The values after condition returns false : ", end ="")   
print (list(itertools.dropwhile(lambda x : x % 2 == 0, li)))  

Output:

The values after condition returns false : [5, 7, 8]

Python - Itertools.filterfalse()

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