The .upper() method in Python is used to convert a string to uppercase.

Syntax:

string.upper()

Example Usage:

text = "hello world"
upper_text = text.upper()
print(upper_text)  # Output: HELLO WORLD

Calling upper() on a variable:

name = "Python"
print(name.upper())  # Output: PYTHON

Calling upper() directly on a string literal:

print("hello".upper())  # Output: HELLO

Would you like more details on how it works?