Can some one help me in understanding below code python lists

Question

list1 = []
list2 = []
list3 = []

def extendlist(val,list=[]):
list.append(val)
return list

list1 = extendlist(10)
list2 = extendlist(123,[])
list3 = extendlist('a')

print("list1 = %s" % list1)
print("list2 = %s" % list2)
print("list3 = %s" % list3)

Answer 1

You have defined 3 empty lists: list1,list2 and list3. Than you have defined a function for appendind value to empty list