Python list to list of lists

Question

Is there an easy way to convert a list of doubles into a list of lists of doubles?

For example:

[1.0, 2.0, 3.0]

into

[[1.0], [2.0], [3.0]]

The code I'm using requires the second as inputs to a bunch of functions but it's annoying to have two copies of the same data.

Answer 1

Just use a list-comprehension wrapping each element in a list:

l = [1.0, 2.0, 3.0]
print [[x] for x in l]
[[1.0], [2.0], [3.0]]