Welcome to the Treehouse Community

Want to collaborate on code errors? Have bugs you need feedback on? Looking for an extra set of eyes on your latest project? Get support with fellow developers, designers, and programmers of all backgrounds and skill levels here with the Treehouse Community! While you're at it, check out some resources Treehouse students have shared here.

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and join thousands of Treehouse students and alumni in the community today.

Start your free trial

Python Functional Python Functional Workhorses Filter comprehension

Stefan Vaziri
Stefan Vaziri
17,453 Points
Posted by Stefan Vaziri
Stefan Vaziri
17,453 Points

Stuck on this one...

Not doing this right and can't figure it out...

filters.py 
words = [
    'yellow',
    'red',
    'yesterday',
    'tomorrow',
    'zucchini',
    'eggplant',
    'year',
    'month',
    'yell',
    'yonder',
]

y_words = words.list(filter(y))

1 Answer

Haider Ali
.a{fill-rule:evenodd;}techdegree seal-36
Haider Ali
Python Development Techdegree Graduate 24,728 Points

Hi there Stefan. This challenge is actually asking you to create a list comprehension instead of using filter(). If you are not familiar with comprehensions in python, you should check out the 13 minute long workshop they have in the library. Here is what your code should look like anyway:

words = [
    'yellow',
    'red',
    'yesterday',
    'tomorrow',
    'zucchini',
    'eggplant',
    'year',
    'month',
    'yell',
    'yonder',
]

y_words = [word for word in words if word[0] == 'y']

This list comprehension goes through each word in words and makes a list of all the words which have an index 0 of 'y'. I hope this helped. If you have any further questions, let me know.

Thanks, Haider

Stefan Vaziri
Stefan Vaziri
17,453 Points
Stefan Vaziri
Stefan Vaziri
17,453 Points

Thanks Haider! Why did you do "if word[0]"? Edit: Nevermind, I got it. Thanks so much!