Python 如果你忽略stopwords，那么《了不起的盖茨比》中有多少PRP标签？

我使用以下代码查找标记为PRP的单词数

但我不知道如何找到标记为PRP的单词数

import nltk
nltk.down
from nltk import word_tokenize
from urllib import request

url = "https://www.gutenberg.org/files/64317/64317-0.txt"
response = request.urlopen(url)
raw = response.read().decode('utf8')

tokens = word_tokenize(raw)

text = nltk.pos_tag(tokens)

tag_fd = nltk.FreqDist(tag for (word, tag) in text)
tag_fd.most_common()