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任务一

请实现一个wordcount函数，统计英文字符串中每个单词出现的次数，通过构建defaultdict字典，可以避免插入值时需要判断值是否存在

from collections import defaultdictdef word_count(text):#构建缓存reval = defaultdict(int)words = text.strip().split()for word in words:# 清洗单词，移除标点符号等cleaned_word = ''.join(char.lower() for char in word if char.isalnum())reval[cleaned_word]+=1return revaltext = """
Got this panda plush toy for my daughter's birthday,
who loves it and takes it everywhere. It's soft and
super cute, and its face has a friendly look. It's
a bit small for what I paid though. I think there
might be other options that are bigger for the
same price. It arrived a day earlier than expected,
so I got to play with it myself before I gave it
to her.
"""print(word_count(text))

输出结果

任务二

首先是进入函数内，目前缓存中有一个局部变量

首先对文本进行split，

执行完函数后