How to get integer values from a string in Python?

Question

Suppose I had a string

string1 = "498results should get"

Now I need to get only integer values from the string like 498. Here I don't want to use list slicing because the integer values may increase like these examples:

string2 = "49867results should get" 
string3 = "497543results should get"

So I want to get only integer values out from the string exactly in the same order. I mean like 498,49867,497543 from string1,string2,string3 respectively.

Can anyone let me know how to do this in a one or two lines?

jamylak · Accepted Answer · 2024-07-04 22:32:13Z

157

>>> import re
>>> string1 = "498results should get"
>>> int(re.search(r'\d+', string1).group())
498

If there are multiple integers in the string:

>>> list(map(int, re.findall(r'\d+', string1)))
[498]

edited Jul 4, 2024 at 22:32

answered Jul 5, 2012 at 6:57

jamylak

134k30 gold badges238 silver badges240 bronze badges

Sign up to request clarification or add additional context in comments.

6 Comments

eLRuLL Over a year ago

this is not exactly correct, yes it will do for string starting with a integer, but if the integer is in the middle of the string, it won't do. Maybe it should be better to use int(re.search(r'\d+', string1).group())

Hussain Over a year ago

If string1 is (020) 3493, it fails.

jamylak Over a year ago

Right it was the wrong code, should ahve used re.search

jamylak Over a year ago

@Hussain well, the example only showed numbers at the fron though but anyway now it's safe either way

Mohsin Aljiwala Over a year ago

This will work fine. But, one should check if result of re.search is not None. Otherwise, it'll throw an AttributeError ('NoneType' object has no attribute 'group') if there is no digit present in the string after accessing .group().

|

3 revs · Accepted Answer · 2017-05-23 12:10:10Z

64

An answer taken from ChristopheD here: https://stackoverflow.com/a/2500023/1225603

r = "456results string789"
s = ''.join(x for x in r if x.isdigit())
print int(s)
456789

edited May 23, 2017 at 12:10

community wiki

3 revs
Sepero

Comments

Bobort · Accepted Answer · 2016-11-17 18:54:05Z

30

Here's your one-liner, without using any regular expressions, which can get expensive at times:

>>> ''.join(filter(str.isdigit, "1234GAgade5312djdl0"))

returns:

'123453120'

answered Nov 17, 2016 at 18:54

Bobort

3,23835 silver badges45 bronze badges

Comments

jacanterbury · Accepted Answer · 2016-05-24 11:07:35Z

22

if you have multiple sets of numbers then this is another option

>>> import re
>>> print(re.findall('\d+', 'xyz123abc456def789'))
['123', '456', '789']

its no good for floating point number strings though.

answered May 24, 2016 at 11:07

jacanterbury

1,5371 gold badge26 silver badges37 bronze badges

Comments

John La Rooy · Accepted Answer · 2012-07-05 07:02:32Z

10

Iterator version

>>> import re
>>> string1 = "498results should get"
>>> [int(x.group()) for x in re.finditer(r'\d+', string1)]
[498]

answered Jul 5, 2012 at 7:02

John La Rooy

306k54 gold badges378 silver badges513 bronze badges

Comments

Craig Citro · Accepted Answer · 2012-07-05 07:06:47Z

7

>>> import itertools
>>> int(''.join(itertools.takewhile(lambda s: s.isdigit(), string1)))

answered Jul 5, 2012 at 7:06

Craig Citro

6,6751 gold badge33 silver badges28 bronze badges

4 Comments

John La Rooy Over a year ago

This will only work if the number is at the start of the string. Also, why not use str.isdigit instead of the lambda?

jamylak Over a year ago

This could also be written as int(''.join(itertools.takewhile(str.isdigit, string1))). I would never actually use either method since this is overcomplicating it.

Craig Citro Over a year ago

groups.google.com/forum/?hl=en&fromgroups#!msg/…

Craig Citro Over a year ago

I'm planning ahead for the case where the strings are thousands of characters long.

huseyin39 · Accepted Answer · 2018-05-16 15:50:39Z

5

With python 3.6, these two lines return a list (may be empty)

>>[int(x) for x in re.findall('\d+', your_string)]

Similar to

>>list(map(int, re.findall('\d+', your_string))

answered May 16, 2018 at 15:50

huseyin39

1,4031 gold badge15 silver badges18 bronze badges

Comments

Lovely Sharma · Accepted Answer · 2021-07-05 05:34:00Z

1

this approach uses list comprehension, just pass the string as argument to the function and it will return a list of integers in that string.

def getIntegers(string):
        numbers = [int(x) for x in string.split() if x.isnumeric()]
        return numbers

Like this

print(getIntegers('this text contains some numbers like 3 5 and 7'))

Output

[3, 5, 7]

answered Jul 5, 2021 at 5:34

Lovely Sharma

214 bronze badges

Comments

hey alex · Accepted Answer · 2022-10-29 14:09:37Z

1

  integerstring=""
  string1 = "498results should get"
  for i in string1:
      if i.isdigit()==True 
      integerstring=integerstring+i
   print(integerstring)

edited Oct 29, 2022 at 14:09

answered Oct 29, 2022 at 14:05

hey alex

112 bronze badges

Comments

JochenJung · Accepted Answer · 2017-10-30 15:46:15Z

0

def function(string):  
    final = ''  
    for i in string:  
        try:   
            final += str(int(i))   
        except ValueError:  
            return int(final)  
print(function("4983results should get"))

edited Oct 30, 2017 at 15:46

JochenJung

7,24312 gold badges67 silver badges114 bronze badges

answered Oct 30, 2017 at 15:20

Kishor Subedi

112 bronze badges

2 Comments

AhmFM Over a year ago

not sure why you had to do return int(final) just returning return final also works.

AhmFM Over a year ago

also can you explain what is making it bring only digits?

user7864386 · Accepted Answer · 2022-02-01 23:40:18Z

-1

Another option is to remove the trailing the letters using rstrip and string.ascii_lowercase (to get the letters):

import string
out = [int(s.replace(' ','').rstrip(string.ascii_lowercase)) for s in strings]

Output:

[498, 49867, 497543]

answered Feb 1, 2022 at 23:40

user7864386

Collectives™ on Stack Overflow

How to get integer values from a string in Python?

11 Answers 11

6 Comments

Comments

Comments

Comments

Comments

4 Comments

Comments

Comments

Comments

2 Comments

Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

11 Answers 11

6 Comments

Comments

Comments

Comments

Comments

4 Comments

Comments

Comments

Comments

2 Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related