Table of Contents
The isalnum() method returns True if all characters in the string are alphanumeric (either alphabets or numbers). If not, it returns False.
The syntax of isalnum() is:
string.isalnum()
1. isalnum() Parameters
The isalnum() doesn’t take any parameters.
2. Return Value from isalnum()
The isalnum() returns:
- True if all characters in the string are alphanumeric
- False if at least one character is not alphanumeric
3. Example 1: Working of isalnum()
name = "M234onica" print(name.isalnum()) # contains whitespace name = "M3onica Gell22er " print(name.isalnum()) name = "Mo3nicaGell22er" print(name.isalnum()) name = "133" print(name.isalnum())
Output
True False True True
4. Example 2: Working of isalnum()
name = "M0n1caG3ll3r"
if name.isalnum() == True:
print("All characters of string (name) are alphanumeric.")
else:
print("All characters are not alphanumeric.")
Output
All characters of string (name) are alphanumeric.
Checkout these related String methods as well:
- Python isalpha()
- Python isdigit()
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