What is isupper() in Python?
In Python, isupper() is a built-in method used for string handling. This method returns “True” if all characters in the string are uppercase, otherwise, returns “False”.
- It returns “True” for whitespaces but if there is only whitespace in the string then returns “False”.
- It does not take any arguments, Therefore, It returns an error if a parameter is passed.
- Digits and symbols return “True” but if the string contains only digits and numbers then returns “False”
This function is used to check if the argument contains any uppercase characters such as:
Input: string = 'w3wiki' Output: True
Syntax of isupper()
Syntax: string.isupper()
Parameters:
- isupper() does not take any parameters
Returns: True- If all characters in the string are uppercase. False- If the string contains 1 or more non-uppercase characters.
Example: Checking for Uppercase Characters
In this code string variable contain value “w3wiki” . String consist of only uppercase letters. When this call the “isupper”method on string , It will return “True” and when it checks the other string “w3wiki” that is mix of upper and lower string it will return “False“.
Python3
string = 'w3wiki' # Define a string containing only uppercase letters print(string.isupper()) # Check if all characters in the string are uppercase and print the result string = 'w3wiki'# Define a string with a mix of uppercase and lowercase letters print(string.isupper()) # Check if all characters in the string are uppercase and print the result |
Output:
True
False
isupper(), islower(), lower(), upper() in Python and their applications
In this article, we will discuss isupper(), islower(), upper(), and lower() functions in Python. These methods are built-in methods used for handling strings. Before studying isupper(), islower(), upper(), and lower() in detail let’s get a basic idea about them.