how to strip anything but a letter from a string python code example

Example 1: python strip characters

# Python3 program to demonstrate the use of 
# strip() method   
  
string = " python strip method test " 
  
# prints the string without stripping 
print(string)  
  
# prints the string by removing leading and trailing whitespaces 
print(string.strip())    
  
# prints the string by removing strip 
print(string.strip(' strip')) 
Output:
 python strip method test 
python strip method test
python method test

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)