isalpha(): Check for Alphabet Characters

my_str.isalpha())

my_str='plus2net'
print(my_str.isalpha())      # Output is False

my_str='Welcome'
print(my_str.isalpha())      # Output is True

my_str='#1234'
print(my_str.isalpha())      # Output is False

my_str='12.34'
print(my_str.isalpha())      # Output is False

Comparison: isalpha() vs isalnum() and isdecimal()

text = "Python123"
print(text.isalpha())   # False (contains digits)
print(text.isalnum())   # True (contains letters and digits)
print(text.isdecimal()) # False (contains letters)

Use Case: Form Validation

Check if a user's name input contains only letters:

name = input("Enter your name: ")
if name.isalpha():
    print("Valid name")
else:
    print("Invalid name")

Example 2: Using isalpha() with Spaces or Symbols

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

Example 3: Validating User Input

name = input("Enter your name: ")
if name.isalpha():
    print("Valid name.")
else:
    print("Invalid input: Use alphabet characters only.")

Applications of isalpha()

• Input Validation: Ensure names and other alphabetic fields contain only letters.
• Text Processing: Identify purely alphabetic words in text data.
• Conditional Formatting: Apply conditional logic based on alphabet-only text.

Subhendu Mohapatra

Author

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