Properly slicing a list of lists
Question:
I have an input stream:
data = [[1,234],[2,432],[3,443]]
How to get the second element of every list? I can get the second value of a single entry by data[0][1], or every list in a range with both elements using data[0:2], but how to get just the second element from every list? Instead of looping, is there a better solution?
Answers:
Use a list comprehension:
[lst[1] for lst in data]
or use operator and map:
from operator import itemgetter
map(itemgetter(1), data)
I have an input stream:
data = [[1,234],[2,432],[3,443]]
How to get the second element of every list? I can get the second value of a single entry by data[0][1], or every list in a range with both elements using data[0:2], but how to get just the second element from every list? Instead of looping, is there a better solution?
Use a list comprehension:
[lst[1] for lst in data]
or use operator and map:
from operator import itemgetter
map(itemgetter(1), data)