Python: Make an iterator that drops elements from the iterable as soon as a condition is true
Python Itertools: Exercise-6 with Solution
Write a Python program to make an iterator that drops elements from the iterable as soon as an element is a positive number.
Sample Solution:
Python Code:
import itertools as it
def drop_while(nums):
return it.dropwhile(lambda x : x < 0, nums)
nums = [-1,-2,-3,4,-10,2,0,5,12]
print("Original list: ",nums)
result = drop_while(nums)
print("Drops elements from the iterable when a positive number arises \n",list(result))
#Alternate solution
def negative_num(x):
return x < 0
def drop_while(nums):
return it.dropwhile(negative_num, nums)
nums = [-1,-2,-3,4,-10,2,0,5,12]
print("Original list: ",nums)
result = drop_while(nums)
print("Drops elements from the iterable when a positive number arises \n",list(result))
Sample Output:
Original list: [-1, -2, -3, 4, -10, 2, 0, 5, 12] Drops elements from the iterable when a positive number arises [4, -10, 2, 0, 5, 12] Original list: [-1, -2, -3, 4, -10, 2, 0, 5, 12] Drops elements from the iterable when a positive number arises [4, -10, 2, 0, 5, 12]
Python Code Editor:
Have another way to solve this solution? Contribute your code (and comments) through Disqus.
Previous: Write a Python program to generate an infinite cycle of elements from an iterable.
Next: Write a Python program to make an iterator that drops elements from the iterable as long as the elements are negative; afterwards, returns every element.
What is the difficulty level of this exercise?
Test your Python skills with w3resource's quiz
Python: Tips of the Day
- New Content published on w3resource:
- Scala Programming Exercises, Practice, Solution
- Python Itertools exercises
- Python Numpy exercises
- Python GeoPy Package exercises
- Python Pandas exercises
- Python nltk exercises
- Python BeautifulSoup exercises
- Form Template
- Composer - PHP Package Manager
- PHPUnit - PHP Testing
- Laravel - PHP Framework
- Angular - JavaScript Framework
- React - JavaScript Library
- Vue - JavaScript Framework
- Jest - JavaScript Testing Framework