在Python中，*和**的意思是：

• • args（非关键字参数）
• • • kwargs（关键字参数）

*args允许我们将可变数量的非关键字参数传递给函数。
例如，

def fn(*num):
    sum = 0
    
    for n in num:
        sum = sum + n

    print("Sum:",sum)

fn(1,2)
fn(4,5,6,7)
fn(1,2,3,5,6)

输出将是，

Sum: 3
Sum: 22
Sum: 17

**kwargs允许我们将可变长度的关键字参数传递给函数。

def intro(**data):
    print("\nData type of argument:",type(data))

    for key, value in data.items():
        print("{} is {}".format(key,value))

intro(Firstname="John", Lastname="Doe", Age=15, Phone=1234567890)
intro(Firstname="Albert", Lastname="Jackson", Email="ajackson@somemail.com", Country="UK", Age=45, Phone=88888888)

如果我们运行上面的程序，输出将是

Data type of argument: <class 'dict'>
Firstname is John
Lastname is Doe
Age is 15
Phone is 1234567890

Data type of argument: <class 'dict'>
Firstname is Albert
Lastname is Jackson
Email is ajackson@somemail.com
Country is UK
Age is 45
Phone is 88888888