Variable parameter functions in Python

I have been learning Python by myself recently. Python is really a good thing, two words, concise, the original function that can only be achieved by writing n lines in Java, Python may be done in a few lines. Closer to home, today I'm going to talk about variable parameter functions in Python.

The variable parameter function can be realized by using * when defining the function.

E.g:

We ask for the sum of several numbers

#求和
def getSum(y,*x):
    sum = y
    for i in x:
        sum+=i
    print(*x)
    return sum
print(getSum(1,2,3,4,5))

*x, we can think of it as a tuple. When calling this function, the first parameter 1 will be passed to y, and the remaining parameters form a tuple and passed to *x. Therefore, the value of *x The value is (2,3,4,5).

Let's look at another form below.

We can also use arbitrary key-value pairs as parameters, which can be achieved by using ** when defining functions.

E.g:

#求和
def getSum(x,**y):
    sum = x
    for k,v in y.items():
        print('添加 {} 键,对应值为{}:'.format(k,v))
        sum+=v
    return sum
print(getSum(1,n=2,y=3,z=4,m=5))

 **y is actually a dictionary type.

That's it for today's sharing!