import re
s='abcd2343 abw34324 abc3243-23A'
re.split('(d+)',s)
> ['abcd', '2343', ' abw', '34324', ' abc', '3243', '-', '23', 'A']
# Or, if you want to split on the first occurrence of a digit:
re.findall('d*D+',s)
> ['abcd', '2343 abw', '34324 abc', '3243-', '23A']