How to convert a string to uppercase or lowercase in Python?

Yes, there are indeed methods to convert a string to uppercase or lowercase in Python.

To convert a string to uppercase, you can use the upper() method. The upper() method returns a new string where all characters are converted to uppercase.

Here’s an example:

my_string = "hello, world!"
new_string = my_string.upper()
print(new_string)

Output:

"HELLO, WORLD!"

In this example, we have defined a string with lowercase characters, and then we call the upper() method on the string to convert all the characters to uppercase.

Similarly, to convert a string to lowercase, you can use the lower() method. The lower() method returns a new string where all characters are converted to lowercase.

Here’s an example:

my_string = "Hello, World!"
new_string = my_string.lower()
print(new_string)

Output:

"hello, world!"

In this example, we have defined a string with uppercase and lowercase characters, and then we call the lower() method on the string to convert all the characters to lowercase.

Note that these methods create new strings and do not modify the original string. If you want to modify the original string, you can re-assign the result of the upper() or lower() method back to the original variable.