CODEWITHSUNDEEP
pythonlist
Anna
Anna

Reputation: 101

Convert list of lists into a normal list

I have a list of lists:

a = [['0.06'], ['0.54'], ['0.61']]

I want to convert this list into normal list like this:

a = [0.06, 0.54, 0.61]

How can I do it it

Upvotes: 3

Views: 6687

Answers (3)

Lukas
Lukas

Reputation: 2312

You can do it with zip() function (returns tuple):

list(zip(*a))[0]

Output: 
('0.06', '0.54', '0.61')

To get list instead of tuple (when you want to modify the list):

list(list(zip(*a))[0])

Output:
['0.06', '0.54', '0.61']

Upvotes: 2

pylang
pylang

Reputation: 44525

Alternatively, using a functional approach:

list(map(lambda x: float(x[0]), a))
# [0.06, 0.54, 0.61]

Using itertools to first merge the sublists:

import itertools as it


list(map(float, it.chain.from_iterable(a)))
# [0.06, 0.54, 0.61]

A list comprehension is arguably more elegant and clever.

Upvotes: 1

wim
wim

Reputation: 362796

Using a list comprehension:

>>> a = [['0.06'], ['0.54'], ['0.61']]
>>> [float(x) for [x] in a]
[0.06, 0.54, 0.61]

Upvotes: 3

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