Python中的多功能参数

素颜马尾好姑娘i 2023-03-05 12:39 118阅读 0赞

The **\*args and \*\*kwargs** is an approach to pass **multiple arguments to a function**. They allow to pass a variable number of arguments to a function. However, please note it is not necessary to name the variables as **\*args** or **\*\*kwargs** only. Only the **\*** is important. We could also name the variables as **\*var** or **\*\*named\_vars**.

**\* args和\*\* kwargs**是一种将**多个参数传递给函数的方法** 。 它们允许将可变数量的参数传递给函数。 但是，请注意，不必将变量仅命名为**\* args**或**\*\* kwargs** 。 仅**\***是重要的。 我们也可以将变量命名为**\* var**或**\*\* named\_vars** 。

## \* args的用法 **(**Usage of \*args**)** ##

**\*args** is used to send a **non-keyworded variable length argument list to a function**.

**\* args**用于将**非关键字的可变长度参数列表发送到函数** 。

**Example:**

**例：**

Python 3.6.8 (default, Apr 25 2019, 21:02:35)
    [GCC 4.8.5 20150623 (Red Hat 4.8.5-36)] on linux
    Type "help", "copyright", "credits" or "license" for more information.
    
    >>> def test_args(arg1, *argv):
    ...     print("first argument :{}".format(arg1))
    ...     for arg in argv:
    ...             print("argument received :{}".format(arg))
    ...
    >>> test_args('test1', 'test2', 'test3')
    first argument :test1
    argument received :test2
    argument received :test3
    >>>

## \*\* kwargs的用法 **(**Usage of \*\*kwargs**)** ##

**\*\*kwargs** allows to pass **keyworded variable length arguments to a method**. The **\*\*kwargs** is used in order to handle **named arguments in a function**.

**\*\* kwargs**允许将**关键字可变长度参数传递给方法** 。 **\*\* kwargs**用于处理**函数中的命名参数** 。

**Example:**

**例：**

Python 3.6.8 (default, Apr 25 2019, 21:02:35)
    [GCC 4.8.5 20150623 (Red Hat 4.8.5-36)] on linux
    Type "help", "copyright", "credits" or "license" for more information.
    
    >>> def welcome_names(**kwargs):
    ...     if kwargs:
    ...             for key, value in kwargs.items():
    ...                     print("{} = {}".format(key, value))
    ...
    >>> welcome_names(name="include_help")
    name = include_help
    >>>

**Example:**

**例：**

Now, let's use \*args for the above function,

现在，我们将\* args用于上述功能，

>>> args = ['test1', 1,2]
    >>> test_multiple_args(*args)
    test1
    1
    2

**Now, using \*\*kwargs,**

**现在，使用\*\* kwargs**

>>> kwargs = {
        "arg3": 3, "arg2": "two","arg1":5}
    >>> test_multiple_args(**kwargs)
    5
    two
    3
    >>>

> 翻译自: [https://www.includehelp.com/python/multiple-function-arguments.aspx][https_www.includehelp.com_python_multiple-function-arguments.aspx]

[https_www.includehelp.com_python_multiple-function-arguments.aspx]: https://www.includehelp.com/python/multiple-function-arguments.aspx