str.isalpha
Check that the string is not empty and contains only letters.
Python 3.13
str.isalpha()Return value
True or False; False for an empty string.
Examples
Letters only
Python 3.13
print('Python'.isalpha())True
String with a space and a digit
Python 3.13
print('Python 3'.isalpha())False
Details
Spaces, digits and punctuation are not letters, while letters of any alphabet, including Cyrillic, are.