String Composition Verification with isOOO() Methods
Functions with names like isalnum()
, isalpha()
, and isdigit()
follow the isXXX()
pattern and are used to verify the composition of a string.
These functions check whether the characters in a string meet specific conditions and return True
or False
accordingly.
The main functions include:
-
isalnum()
: Checks if the string contains only alphabetic characters (A–Z, a–z) and digits (0–9), with no spaces or special characters. -
isalpha()
: Checks if the string contains only alphabetic characters (A–Z, a–z). -
isdigit()
: Checks if all characters in the string are digits (0–9).
text = "Python3" print(text.isalnum()) # True print(text.isalpha()) # False print(text.isdigit()) # False
When are these functions used?
isOOO()
functions are primarily used to validate user input or clean data by checking whether the input matches expected character types.
text = input("Please enter your username containing letters or numbers: ") if text.isalnum(): print("Valid input: The string contains only letters and/or numbers.") else: print("Invalid input: The string contains special characters or spaces.")
What function checks if a string contains only alphabetic characters?
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