python how to remove all letters from string code example

Example 1: python remove non letters from string

def nospecial(text):
	import re
	text = re.sub("[^a-zA-Z0-9]+", "",text)
	return text

Example 2: python remove letters from string

string = "abc123"
# Method 1
''.join(char for char in string if char.isdigit())

#Method 2
import re
re.sub("[^0-9]", "", string)