Replace blank spaces of a list

Question

My script gives 2 string lists, a and b . I want to convert them to float lists to do some calculations, but the lists have some gaps. For example, i have a = ["1"," ","3","4"] and i want to fill those gaps with 0 and have this a = ["1","0","3","4"]

@MosesKoledoye Pretty sure he meant "1"," ","3","4". You should edit Wilson. — kabanus, Jun 26 '17 at 08:53
Where did the 'gaps' (empty strings?) come from, maybe you can stop them arising in the list in the first place — Chris_Rands, Jun 26 '17 at 08:59

vZ10 · Answer 1 · 2017-06-26T08:56:45.007

1

a = list(map(lambda x: float(x) if x else .0, a))

edited Jun 26 '17 at 08:56

answered Jun 26 '17 at 08:54

vZ10

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If I understood him you probably want `float(x) if x`. – kabanus Jun 26 '17 at 08:55

score 1 · Answer 2 · answered Jun 26 '17 at 09:22

Using a list-comprehension.

a = ["1", " ", "3", "4"]

[float(i) if i.strip() else 0. for i in a]
# [1.0, 0.0, 3.0, 4.0]

The strip() part is to make " " String evaluated to False.

 >>> bool("")
 False
 >>> bool("   ")
 True
 >>> bool("   ".strip())
 False

orginal source

Replace blank spaces of a list

2 Answers2