多选题

知识点：Python 6/10（单选） What is the outpu...

Question

知识点：Python 6/10（单选）
What is the output of the following snippet of code?

total={}
def insert(items):
    if items in total:
        total[items] += 1
    else:
        total[items] = 1
insert('Apple')
insert('Ball')
insert('Apple')
print (len(total))

A. 3

B. 1

C. 2

D. 0