I have a simple task of selecting all elements from a list (sorted in descending order) that lie above a given element. ie
X=[32,28,26,21,14,11,8,6,3]
Threshold=12
Result=[32,28,26,21,14]
What I did initially was something simple like
FullList=[x for x in FullList if x>=Threshold]
However, since the list is sorted, I can (and need to) break in between.
After much head banging and a beautiful tutorial here , I finally came up with the following solution.
def stopIteration():
raise StopIteration
FullList=list(x if x>=Threshold else stopIteration() for x in FullList )
However, when I write the following statement, it gives me a syntax error:
FullList=list(x if x>=Threshold else raise StopIteration for x in FullList )
What is the reason behind this behaviour?
raise
is a statement, but inside another statement you can only use expressions.
Also, why not use itertools.takewhile
?
full_list = list(itertools.takewhile(lambda x: x >= threshold, full_list))
The technical post webpages of this site follow the CC BY-SA 4.0 protocol. If you need to reprint, please indicate the site URL or the original address.Any question please contact:yoyou2525@163.com.