filter digit number in string

http://stackoverflow.com/questions/1450897/python-removing-characters-except-digits-from-string

 

import re 
re.sub("/D", "", "aas30dsa20") 
'3020' 

 

/D matches any non-digit character so, the code above, is essentially replacing every non-digit character for the empty string.

 

Or you can use filter, like so (in Python 2k):

filter(lambda x: x.isdigit(), "aas30dsa20") 

Since in Python 3k, filter returns an iterator instead of a list, you can use the following instead:

>>> ''.join(filter(lambda x: x.isdigit(), "aas30dsa20")) 
'3020' 

s=''.join(i for i in s if i.isdigit()) 

Another generator variant.

 

>>> s = "foo200bar" 
>>> new_s = "".join(i for i in s if i in "0123456789") 

 

>>> text = "9jk78k.9k87h.ji09j9oj" 
>>> print "".join(i for i in text if i in ".0123456789").replace(".",",",1).replace(".","").replace(",",".") 
978.987099