Python String to List with RegEx

Question

I would like to convert mystring into list.

Input : "(11,4) , (2, 4), (5,4), (2,3) "
Output: ['11', '4', '2', '4', '5', '4', '2', '3']



>>>mystring="(11,4) , (2, 4), (5,4), (2,3)"
>>>mystring=re.sub(r'\s', '', mystring) #remove all whilespaces
>>>print mystring
(11,4),(2,4),(5,4),(2,3)

>>>splitter = re.compile(r'[\D]+')
>>>print splitter.split(mystring)
['', '11', '4', '2', '4', '5', '4', '2', '3', '']

In this list first and last element are empty. (unwanted)

Is there any better way to do this.

Thank you.

Joke method, don't use this: strings, string = [], '' then for char in "(11,4) , (2, 4), (5,4), (2,3) ": string = string + char if char.isdigit() else strings.append(string) or '' if string else '' and the result is in strings at the end. — agf
– agf, Commented Sep 30, 2011 at 14:05

Steven Rumbalski · Accepted Answer · 2011-09-30 13:53:09Z

8

>>> re.findall(r'\d+', "(11,4) , (2, 4), (5,4), (2,3) ")
['11', '4', '2', '4', '5', '4', '2', '3']

answered Sep 30, 2011 at 13:53

Steven Rumbalski

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a'r · Accepted Answer · 2011-09-30 13:52:00Z

1

It would be better to remove whitespace and round brackets and then simply split on comma.

answered Sep 30, 2011 at 13:52

a'r

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1 Comment

agf Over a year ago

mystring.strip(' \t\r\n()').split(',') and they're called parenthesis not round brackets ;)

agf · Accepted Answer · 2011-09-30 14:30:49Z

0

>>> alist = ast.literal_eval("(11,4) , (2, 4), (5,4), (2,3) ")

>>> alist
((11, 4), (2, 4), (5, 4), (2, 3))

>>> anotherlist = [item for atuple in alist for item in atuple]
>>> anotherlist
[11, 4, 2, 4, 5, 4, 2, 3]

Now, assuming you want list elements to be string, it would be enough to do:

>>> anotherlist = [str(item) for atuple in alist for item in atuple]
>>> anotherlist
['11', '4', '2', '4', '5', '4', '2', '3']

The assumption is that the input string is representing a valid python tuple, which may or may not be the case.

edited Sep 30, 2011 at 14:30

agf

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answered Sep 30, 2011 at 13:57

Savino Sguera

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1 Comment

Steven Rumbalski Over a year ago

As phrased he wants strings, not integers.

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