숫자만 추출하기

number = re.findall("\d+",expression)

묶음단위로

number = re.findall("\d+",expression)

한글자 단위로

import re

expression = "100-200*300-500+20"

number = re.findall("\d+",expression)

print('number :',number)
# number : ['100', '200', '300', '500', '20']

number = re.findall("\d", expression)

print('number :',number)
# number : ['1', '0', '0', '2', '0', '0', '3', '0', '0', '5', '0', '0', '2', '0']