python def -> :
时间: 2023-07-24 19:12:44 浏览: 50
In Python, the colon `:` is used to indicate the start of a new code block. When defining a function using the `def` keyword, the colon is used to separate the function header (which includes the function name and any parameters) from the function body.
Here's an example of a function definition using the colon:
```
def greet(name):
"""This function greets the person passed in as a parameter"""
print("Hello, " + name + ". How are you?")
```
In this example, the colon is used after the parameter `name` in the function header, and it indicates that the code block that follows is the function body. The `"""docstring"""` is also considered part of the function header, and it precedes the colon.
When calling the function later in your code, you do not use a colon. Instead, you simply write the function name followed by any arguments in parentheses, like this:
```
greet("Alice")
```
This would output "Hello, Alice. How are you?" to the console, since the function body contains a print statement that includes the `name` parameter.