What keyword is used to indicate the start of a method in a Python class?

Question

BlackTom AI · Accepted Answer

def defines a function or method in Python, so it is the keyword used to indicate the start of a method inside a class.

1) Relevant concepts:
- In Python a method is simply a function that is defined inside a class. Functions and methods are introduced with the same keyword, def.
- The typical method syntax is: def method_name(self, other_args): followed by an indented block that forms the method body.
- def is a reserved keyword in Python; it signals the interpreter that a new function object is being defined.

2) Step-by-step reasoning and example:
- Create a class named MyClass.
- Inside the class body, write def greet(self): to start the method definition.
- Add an indented body, e.g. print("hello").
Example (plain text):
class MyClass:
    def greet(self):
        print("hello")
- When Python executes that class block, it sees def greet(...) and creates a function object bound as an attribute of MyClass; when accessed on an instance it becomes a bound method.

3) Intermediate “steps” (how the interpreter treats it):
- Parser encounters class statement, enters suite.
- It encounters def, parses the function signature and suite.
- A function object is created and assigned to the class namespace under the given name.
- Accessing instance.greet produces a bound method that supplies the instance as self.

4) Why the correct answer is correct:
- def is the language-level keyword specified in the Python reference for function (and thus method) definitions. It is the explicit mechanism to start a method declaration.

5) Why other choices are incorrect:
- function: not a Python keyword; you cannot write function my_method(...).
- break: a loop-control keyword used to exit loops, not to define functions.
- continue: a loop-control keyword used to skip to the next loop iteration, not to define functions.

Conclusion: The correct keyword is def, which matches the provided answer.

What keyword is used to indicate the start of a method in a Python class?单项选择题

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