python def ->
时间: 2023-07-12 11:13:23 浏览: 43
In Python, `def` is a keyword used to define a function. The basic syntax of defining a function is:
```
def function_name(parameters):
"""docstring"""
# code block
return [expression]
```
Here, `function_name` is the name of the function, and `parameters` are the inputs that the function takes. The code block under the function definition is executed when the function is called, and the `return` statement specifies the value that the function returns (if any).
The `docstring` is a string literal that describes what the function does. It is optional, but it is good practice to include informative docstrings in your code to help others understand how to use your function.
相关问题
python def func ->
In Python, `def` is a keyword used to define a function. The basic syntax of defining a function is:
```
def function_name(parameters):
"""docstring"""
# code block
return [expression]
```
Here, `function_name` is the name of the function, and `parameters` are the inputs that the function takes. The code block under the function definition is executed when the function is called, and the `return` statement specifies the value that the function returns (if any).
The `docstring` is a string literal that describes what the function does. It is optional, but it is good practice to include informative docstrings in your code to help others understand how to use your function.
Python 中->
在Python中,符号 "->" 用来表示函数的返回值类型。这是Python 3.5引入的类型注解功能的一部分,可以在函数定义中指定参数和返回值的类型。它通过允许将元数据附加到描述其参数和返回值的函数来扩展该功能。使用箭头后面跟着返回值的类型,例如def greeting(name: str) -> str:表示函数greeting接受一个参数name,类型为str,并且返回一个类型为str的值。
这个符号的好处是,它方便了对参数类型进行注释,并且可以编写装饰器来验证注释或强制参数的正确类型。它还允许特定于参数的文档,而不是将其编码到docstring中。
需要注意的是,这只是类型注解,不会强制函数返回指定类型的值。在Python中,函数的返回值类型不属于语言的强制类型检查,因此函数可以返回任何类型的值,即使这与类型注解不符。