CODEWITHSUNDEEP
pythonstringlistfloating-point
Abhinav Kumar
Abhinav Kumar

Reputation: 1682

Python lists, strings, and floates

I have a list like: [['45.1'], ['21.1'],['42.1']]. I think each item is stored as a string here (am I wrong?). I want it look like [45.1,21.1,42.1]. How do I do it? I need to be able to do numerical calculations over these elements of the list.

Upvotes: 0

Views: 79

Answers (2)

Ashwini Chaudhary
Ashwini Chaudhary

Reputation: 251106

Use a simple list comprehension:

>>> lis =  [['45.1'], ['21.1'],['42.1']]
>>> [float(y) for x in lis for y in x]
[45.1, 21.1, 42.1]

or a faster method using itertools.chain.from_iterable with a list comprehension:

>>> from itertools import chain
>>> [float(x) for x in chain.from_iterable(lis)]
[45.1, 21.1, 42.1]

Upvotes: 3

Ryan Saxe
Ryan Saxe

Reputation: 17869

just use list comprehension:

l = [['45.1'], ['21.1'],['42.1']]
my_list = [float(i[0]) for i in l]
>>> my_list
[45.1,21.1,42.1]

Upvotes: 2

Related Questions