What keyword is used to define a method in Python?

In Python, the keyword used to define a method is "def." This keyword indicates the start of a function definition and is a crucial part of the syntax in Python programming. When you use "def," you specify the name of the method, followed by parentheses that may include parameters, and then a colon. This allows Python to recognize that a new block of code is being defined as a function or method.

For example, a simple method definition would look like this:

def my_function(parameter):

# method body

pass

The use of "def" is essential because it informs the Python interpreter about the following indented block of code that constitutes the function body, marking the beginning of the function's scope. The other choices do not represent valid Python syntax for defining methods; therefore, they do not function as commands within the language.