新手求指导，不知道第四行哪有问题

lst = ["笔","本","笔","书","本","笔","本"]

counts = {}

for i in lst:

    counts[i]=counts.get(i,0)+1

print(counts)

代码没有问题啊

这个代码就是统计列表中各元素出现的次数 

运行结果

{'笔': 3, '本': 3, '书': 1}

'笔'出现3次: '本'出现3次数, '书'出现1次

lst = ["笔","本","笔","书","本","笔","本"]
counts = {}
for i in lst:
    counts[i]=counts.get(i,0)+1
print(counts)

我这边用anaconda 运行没问题，

得出的输出结果

{'笔': 3, '本': 3, '书': 1}

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