Python bit record 11: Collection of function parameters

In 8python, when you are unsure of the number of arguments to pass to a function, you can use *args and **kargs forms (args, Kargs can be defined with a different name).

I. Form of *args

EG1:

def func (x,*a): Print x print a func (1,2,3,4,5)

After calling the function, the result is:

1 (2, 3, 4, 5)

As can be seen from the results, when *a is used, when multiple arguments are passed to a function, the function passes the first argument to the first parameter, and then passes the remaining arguments to *a, and *a places the remaining arguments in a tuple.

If the function is defined (X,*A) and the argument is passed with only one argument, then *a will generate an empty tuple.

EG2:

def func (x,*a): Print x Print a func (1)

After calling the function, the result is:

1 ()

As you can see from the results, parameter 1 is passed to X, and *a generates an empty tuple.

It is important to note that when there is only one element in the element, the element needs to be appended with a ","

EG3:

def func (x,*a): Print x print a Func

After calling the function, the result is:

1 (2,)

There is only one element in the tuple, 2, followed by a ",".

Ii. Forms of *kargs

The *kargs form will have the received parameter in a dictionary, so it needs to be in the form of a key-value team when passing parameters.

EG1:

def func (i,**a): Print a print i func (3,x=4)

The result of the execution is:

{' X ': 4}3

Notice how the parameter is passed: x=4

Python bit record 11: Collection of function parameters