Variable Argument Lists in Python
In Python, it is possible to create functions that accept a variable number of arguments. This is achieved by using the asterisk (*) operator followed by the argument name, like this:
1 2 |
|
The argument *args is a special variable that will receive a tuple containing all the arguments passed to the function. For example, if you call the function like this:
1 |
|
The *args variable will contain the tuple (1, 2, 3, 4, 5).
Note that the *args argument must be the last argument in the function signature, or Python will raise a SyntaxError.
Unpacking Arguments
The *args variable contains a tuple of the arguments, but you may want to unpack them into individual variables. This can be done by using the splat operator (*):
1 2 3 |
|
This example will print each argument on a separate line.
Keyword Arguments
Keyword arguments are arguments that are passed to a function by name. They are denoted by a colon (:) followed by the keyword, like this:
1 2 |
|
The **kwargs argument is a special variable that will receive a dictionary containing all the keyword arguments passed to the function. For example, if you call the function like this:
1 |
|
The **kwargs variable will contain the dictionary {'name': 'John', 'age': 30}.
Combining Varargs and Keyword Arguments
You can combine varargs and keyword arguments in a single function by using the following syntax:
1 2 |
|
The varargs argument must be placed before the keyword arguments in the function signature.
Conclusion
Variable argument lists in Python are a powerful feature that allows you to create functions that can accept any number or type of arguments, making them highly flexible and reusable.
The above is the detailed content of How Do Variable Argument Lists Work in Python?. For more information, please follow other related articles on the PHP Chinese website!