Python pulling all integers and floats from a string

Question

So I have this list:

a = '[47.2, 46.6, 46.4, 46.0, 45.7, 45.54, 45.29, 45.01, 44.79, 44.54, 44.15, 0.0]'

How can i pull all the floats and integers in order

I tried

import re
a = [float(s) for s in re.findall("\d+\.\d+", a)]

but doesn't pull integers

Expecting =

a = [47.2, 46.6, 46.4, 46, 45.7, 45.54, 45.29, 45.01, 44.79, 44.54, 44.15, 0]

can you elaborate more? do you want to sort the list which contains integer as well as floats? can you add sample output? — Priyank Chheda
– Priyank Chheda, Commented Oct 29, 2020 at 7:03
Does this answer your question? How to convert string representation of list to a list? — buran
– buran, Commented Oct 29, 2020 at 7:14

buran · Accepted Answer · 2020-10-29 07:09:21Z

1

Keep it simple

spam = '[47.2, 46.6, 46.4, 46, 45.7, 45.54, 45.29, 45.01, 44.79, 44.54, 44.15, 0]'

#using json
import json
eggs = json.loads(spam)
print(eggs)

# ast.literal_eval
from ast import literal_eval
eggs = literal_eval(spam)
print(eggs)

answered Oct 29, 2020 at 7:09

buran

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3 Comments

Siva Shanmugam Over a year ago

How come using json is easy and without knowing the background work? And clearly user has mentioned in the code using re in is code.

buran Over a year ago

@SivaShanmugam, OP is asking to convert string representation of a list into list object. They are using re (because they don't know better, or for whatever reason). That doesn't mean we must stick to sub-optimal attempt to complete the task.

buran Over a year ago

@SivaShanmugam, note that you can see examples of XYproblem. Some users may ask a question based on their attempt to complete some task (e.g. error they get), but actually what they want is not even in the question (i.e. actual task they try to complete). This one may well be one of them too.

Siva Shanmugam · Accepted Answer · 2020-10-29 07:05:06Z

1

Regex:

\d+(?:\.\d+)?

Code:

import re
a = [float(s) for s in re.findall("\d+(?:\.\d+)?", a)]
print (a)

Output:

[47.2, 46.6, 46.4, 46.0, 45.7, 45.54, 45.29, 45.01, 44.79, 44.54, 44.15, 0.0]

answered Oct 29, 2020 at 7:05

Siva Shanmugam

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1 Comment

Siva Shanmugam Over a year ago

Glad to know. Please accept the answer, so that it easy for the people to not open the question again.

Simplecode · Accepted Answer · 2020-10-29 07:04:41Z

0

This is because you are including the . to be matched in the regex. Pls. change the regex for integers

You should use (\d+(?:\.\d+)?) instead of your regex

answered Oct 29, 2020 at 7:04

Simplecode

6049 silver badges21 bronze badges

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