What keyword is used to define a function in Python?

In Python, the keyword used to define a function is "def." This keyword is juxtaposed with the function name, and it is followed by parentheses that may include parameters. When the "def" keyword is encountered, it signals the beginning of a function definition.

For instance, when you write:

def my_function():

print("Hello, world!")

The "def" keyword indicates that you are defining a new function named "my_function." The use of "def" is specific to Python and crucial for structuring your code, as it helps to create reusable blocks of code that encapsulate specific functionality.

The other terms mentioned do not serve this purpose in Python. "function" and "define" are not recognized keywords in Python’s syntax, and while "method" is a term commonly used in object-oriented programming to refer to functions that are part of a class, it is not the keyword to define a standalone function. Hence, "def" is the correct and only keyword to use when defining a function in Python.