Python list, how to pick up pure numbers in list

Question

a = [['0.15592', '0.28075'],
     ['0.36807889', '0.35', '0.57681501876'],
     ['0.21342619', '0.0519085', '0.042', '0.27', '0.50620017', '0.528'],
     ['0.2094294', '0.1117', '0.53012', '0.3729850', '0.39325246'],
     ['0.21385894', '0.3464815', '0.57982969', '0.10262264'],
     ['0.29584013', '0.17383923']]

I want to change it to:

t = [0.15592, 0.28075, 0.36807889, 0.35, 0.57681501876, 0.21342619,
     0.0519085, 0.042, 0.27, 0.50620017, 0.528, 0.2094294, 0.1117,
     0.53012, 0.3729850, 0.39325246, 0.21385894, 0.3464815, 0.57982969,
     0.10262264, 0.29584013, 0.17383923]

New beginner, Thanks a lot!

score 3 · Answer 1 · answered Apr 14 '16 at 07:34

3

Try this:

t = [float(u) for s in a for u in s]

This assumes that the list is two deep. It flattens the list and converts the numbers to floats. This uses a list comprehension, which is more efficient than explicitly iterating and appending.

answered Apr 14 '16 at 07:34

Tom Karzes

20,042
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Ahsanul Haque · Answer 2 · 2016-04-14T07:39:47.263

1

You can use itertools.chain

from itertools import chain
print map(float,list(chain(*a)))

edited Apr 14 '16 at 07:39

answered Apr 14 '16 at 07:36

Ahsanul Haque

9,865
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1

This doesn't work. It creates a list of strings, not floats. – Tom Karzes Apr 14 '16 at 07:38
Edited. Of course in python 3 you should make it a list. – Ahsanul Haque Apr 14 '16 at 07:40

score 0 · Answer 3 · answered Apr 14 '16 at 07:35

0

Try this

t = []
for i in a:
    for j in i:
        t.append(float(j))
print t

answered Apr 14 '16 at 07:35

cjahangir

1,683
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Python list, how to pick up pure numbers in list

3 Answers3

Try this