In Python, the str.isalpha() method is used to check if all characters in a string are alphabetic (i.e., letters of the alphabet). This method returns True if all characters in the string are alphabetic and there is at least one character; otherwise, it returns False.

Syntax

str.isalpha()

Example Usage

1. Basic usage with alphabetic characters:

text = "Hello"
result = text.isalpha()
print(result)  # Output: True

2. Including only letters:

text = "Hello123"
result = text.isalpha()
print(result)  # Output: False

3. Checking an empty string:

text = ""
result = text.isalpha()
print(result)  # Output: False

4. With spaces and punctuation:

text = "Hello World!"
result = text.isalpha()
print(result)  # Output: False

5. Using non-English alphabetic characters:

text = "Café"
result = text.isalpha()
print(result)  # Output: True

Important Notes

• The isalpha() method only considers letters defined in Unicode, so it can recognize alphabetic characters from various languages, including accented characters.
• If the string contains any character that is not a letter (like digits, spaces, punctuation, etc.), isalpha() will return False.

Summary

• Use str.isalpha() to check if a string contains only alphabetic characters.
• It returns True for strings composed solely of letters and False for any string that contains numbers, spaces, or special characters.