Quick question for python

Question

How do I make a function that takes a list of strings and returns a new list containing all the strings with a length of 3?

Def threeChars(li):

For i in range(len(st):
If char <3 or >3:
(Don’t print strings anything less or greater than 3?) not sure how

Print(I)
Li = [‘hello’, ‘and’, ‘he’, ‘dog’

Print(threeChars(li))

Output[and, dog]

Answer 1

The most convenient ones are one-liners so here you go:

List comprehension:
[s for s in strings if len(s) == 3]

Filter:
list(filter(lambda s: len(s) == 3, strings))

So you just return one of those in your function.

There's not much to explain here. I recommend you go read up on list comprehensions because they're useful everywhere.

Answer 2

Chris , I can suggest you the filter method. Look at my example. Hope it helps you.
https://code.sololearn.com/cXsYC84Pgsjn/?ref=app

Answer 3

you can try this:
def threeChars(str_array):
return [string for string in str_array if len(string) == 3]

or better:
def threeChars(str_array):
return [string for string in str_array if type(string) == str if len(string) == 3]

if you don't like one-liners:
def threeChars(str_array):
result = []
for string in str_array:
if type(string) == str:
if len(string) == 3:
result.append(string)
return result