[Tutor] create numpy array from list of strings

[Kent Johnson]

On Tue, Jun 3, 2008 at 10:35 PM, washakie <washakie at gmail.com> wrote:
>  I guess I assumed there would be a way to 'nest' list
> comprehension somehow.

Sure, just nest them. You have:

tempDATA=[]
for i in data[stind:-1]:
       tempDATA.append([float(j) for j in i.split()])

This has the form

tempDATA=[]
for i in sequence:
       tempDATA.append(expr(i))

Code in this form can become the list comprehension

tempDATA = [ expr(i) for i in sequence ]

which in your case becomes

tempDATA=[ [float(j) for j in i.split()] for i in data[stind:-1] ]

You can also have multiple loops in a single list comp; if you wanted
a single list of floats, instead of a list of lists, you could write

tempDATA=[ float(j) for i in data[stind:-1] for j in i.split() ]

Note that the order of 'for' clauses is reversed; it is the same order
as you would use with nested for loops.

Kent