函数内是否可以修改传递进来的列表

def test(a):
    # a+=a
    # a+=a是在原数据上的修改，而a=a+ashi先定义一个变量然后修改
    a=a+a

    print(a)
num=[11,22,33,44]
test(num)
print(num)

yunxingyunyunxingjieguo :

E:\Python35\python.exe F:/Exercise/Python/test0731/登陆.py
[11, 22, 33, 44, 11, 22, 33, 44]
[11, 22, 33, 44]

Process finished with exit code 0