how to check if a string is a single letter in the alphabet python code example

Example 1: how to check if a string is composed only of alphabets in python

str1 = "hello world. welcome to python examples."

bool = str1.isalpha()

print('str1 contains only alphabets:', bool)
//output will be False

Example 2: check if string contains alphabets python

import re
print(re.search('[a-zA-Z]', "anything"))