A community for students.
Here's the question you clicked on:
 0 viewing
susanjrobertson
 3 years ago
I'm having a hard time with the final written exercise. I've read about list comprehensions, but something isn't clicking for me. Any help is appreciated.
susanjrobertson
 3 years ago
I'm having a hard time with the final written exercise. I've read about list comprehensions, but something isn't clicking for me. Any help is appreciated.

This Question is Closed

snark
 3 years ago
Best ResponseYou've already chosen the best response.3they are just another way of producing a new list. if a = [1,2,3,4,5,6,7,8], we could produce a list of the squared elements of a: sqrs = [] # an empty list for x in a: # for each element of a b.append(x*x) # add x*x to the list b list comprehensions just give you a more concise mechanism to do it: b = [ x*x for x in a] # b is the same list as produced above. if we have some function def def f(x): return x*x*x + 17 we can produce a list of f(i) for each i in a b = [f(i) for i in a] which is the list [f(1),f(2)...f(8)] we can even add a condition: b = [x for x in a if x % 2 == 0] this is the same as: b = [] for x in a: if x % 2 == 0: b.append(x) a list comprehension is only a shorter (different) way of doing it, despite the name, nothing really new. play with a few in idle. a = [1,2,3,4], b = [x/2 for x in a], and print b. I hope I haven't made things worse...

andrew.m.higgs
 3 years ago
Best ResponseYou've already chosen the best response.0Very nice concise answer. Thank you for asking the question Susan. That gave snark the opportunity to answer.

susanjrobertson
 3 years ago
Best ResponseYou've already chosen the best response.0Thanks so much  I think I'm getting it :)

Screech
 3 years ago
Best ResponseYou've already chosen the best response.0Thank you for bringing it up. I was struggling as well and was unfamiliar with list comprehensions. I'll study up.
Ask your own question
Sign UpFind more explanations on OpenStudy
Your question is ready. Sign up for free to start getting answers.
spraguer
(Moderator)
5
→ View Detailed Profile
is replying to Can someone tell me what button the professor is hitting...
23
 Teamwork 19 Teammate
 Problem Solving 19 Hero
 Engagement 19 Mad Hatter
 You have blocked this person.
 ✔ You're a fan Checking fan status...
Thanks for being so helpful in mathematics. If you are getting quality help, make sure you spread the word about OpenStudy.