Question

Say I got a string:

s = '''1 2 3
4 5 6
7 8 9
'''

I want to turn each line of string s into a list of floating-point value, that is:

l = [[1.0 2.0 3.0], [4.0 5.0 6.0], [7.0 8.0 9.0]]

How can I do this in one line?

Answer 1

s = '''1 2 3
4 5 6
7 8 9'''

l = [ map( float, i.strip().split(" ") ) for i in s.split( "\n" ) ] 

Note strip isn’t needed when there isn’t ‘loose’ spaces.
Strip works as trim eg. in php .