Python Code Demonstrating String Methods
The following Python code illustrates how to use various string methods to check the properties of a string, such as whether it consists of alphanumeric characters, lowercase letters, digits, and more.
Example: String Checks
# Filename: test.py
# Author: www.runoob.com
# Test Case 1
print("Test Case 1")
str1 = "runoob.com"
print(str1.isalnum()) # Checks if all characters are alphanumeric
print(str1.isalpha()) # Checks if all characters are alphabetic
print(str1.isdigit()) # Checks if all characters are digits
print(str1.islower()) # Checks if all characters are lowercase
print(str1.isupper()) # Checks if all characters are uppercase
print(str1.istitle()) # Checks if the string follows title case
print(str1.isspace()) # Checks if all characters are whitespace
print("------------------------")
# Test Case 2
print("Test Case 2")
str2 = "runoob"
print(str2.isalnum())
print(str2.isalpha())
print(str2.isdigit())
print(str2.islower())
print(str2.isupper())
print(str2.istitle())
print(str2.isspace())Sample Output:
Test Case 1 False False False True False False False ------------------------ Test Case 2 True True False True False False
Explanation:
isalnum(): Checks if all characters are alphanumeric (letters and numbers).isalpha(): Checks if all characters are alphabetic (only letters).isdigit(): Checks if all characters are digits (numbers).islower(): Checks if all characters are lowercase.isupper(): Checks if all characters are uppercase.istitle(): Checks if the string is in title case (first letter of each word is uppercase).isspace(): Checks if the string consists only of whitespace characters like spaces, tabs, and newlines.
