In this article, we will learn about isupper(), islower() ,upper() , lower() function in Python 3.x. or earlier.
These are the functions that can be used on strings and related types. They are included in Python Standard Library.
All the functions accept no arguments. The isupper() & islower() return boolean values whereas the upper() & lower() function returns strings either in uppercase or lowercase.
Now let’s see the implementation using an example
Example
string = 'tutorialspoint' # checking for uppercase characters print(string.isupper()) # checking for lowercase characters print(string.islower()) # convert to uppercase characters print(string.upper()) # convert to lowercase characters print(string.lower())
Output
False True TUTORIALSPOINT tutorialspoint
Explanation
If any parameter is passed error is raised by the interpreter. As observed from the output that all alphabets are converted to the desired case. In case the string contains any integer or symbolic character no change is observed.
Conclusion
In this article, we learnt about isupper(), islower() , lower() & upper() functions in Python 3.x. Or earlier