没懂

dic_word='When I wrote the following pages, or rather the bulk of them,\
 I lived alone, in the woods, woods woods a mile from any neighbor, in a house which'
dic_word=dic_word.lower()
words= dic_word.split()

word_freg={} #构建一个空字典，用于后续记录个单词的频次
for word in words:
    if word in word_freg.keys():
        word_freg[word]+=1
    else:
        word_freg[word]=1