Python：函数可变参数、关键字参数

可变参数：加*

def test(*numbers):
    sum = 0
    for i in numbers:
        sum = sum + i
    return sum

print(test(4, 5))
print(test(4, 5, 5))
l4 = [4, 5, 6]
print(test(*l4))

关键字参数：加**kw

关键字参数在函数内部自动组装为一个dict

def test(name, age, **kw):
    print('name:', name, 'age:', age, 'other:', kw)

test('jack', 18)
test('jackson', 18, city='beijing')
test('judy', 18, city='beijing', job='engineer')

extra = {
     'city': 'Beijing', 'job': 'Engineer'}
test('jeacka', 18, **extra)

args是可变参数，args接收的是一个tuple
kw是关键字参数，kw接收的是一个dict