(reproduced) Python: list as parameter

There are three simple things to look at:

def changelist (l):    l[0] = 5 def changeList1 (l):    l = []def changeList2 (L):    l[:] = []a = [1,2,3]changelist (a) PRI NT (a) b = [1,2,3]changelist1 (b) print (b) c = [1,2,3]changelist2 (c) print (c)

Output Result:

[5, 2, 3] [1, 2, 3] []

In the first case, because the list is mutable, it can be changed. The second case is to create a new [] object in the ChangeList1 function, and then name L. To have a practical effect on a list in a function, like changeList2.

(reproduced) Python: list as parameter