How do I extract a number from a string in Python?

Question

I have the following string in Python.

"My number is 5"

How can I check to see if a string contains a number and subsequently extract it, thus giving me the string "5"?

Edit: By using the re module, I'm now getting the result [u,'5']. How can I get the number 5 out of this result?

Hackaholic · Answer 1 · 2014-12-14T21:01:54.897

2

you need to use regex:

import re
my_num = re.findall("\d+","my number is 5")

\d+ match 1 or more occurence of [0-9]

demo to extract the number from 0-20:

>>> a ="my string may 0-20, but how to remove number like 30,22 etc"
>>> my_num = re.findall('\d+',a)
>>> [int(x) for x in my_num if int(x)<=20]
[0, 20]

edited Dec 14 '14 at 21:01

answered Dec 14 '14 at 20:51

Hackaholic

19,069
5
54
72

Okay. And what about higher numbers? I need to check for digits ranging from 0 - 20. – Ben Dec 14 '14 at 20:54
plz provide all information in ur question. like expected input, expected output and wt u tried so far – Hackaholic Dec 14 '14 at 20:55
plz add comment for downvote, so one can correct – Hackaholic Dec 14 '14 at 20:59

How do I extract a number from a string in Python?

1 Answers1