在python中，需要保存所有结果，而不仅仅是最后一个结果

这是计算文件中单词的工作代码，但是 问题是result.csv只包含最后一个结果，而不是所有结果

修复后的代码应该是什么样子

谢谢

import re
import string

frequency = {}


out_filename = "result.csv"
headers = "word,requency \n"

document_text = open('joined.xml', 'r')
text_string = document_text.read().lower()
match_pattern = re.findall(r'\b[a-z]{3,15}\b', text_string)


for word in match_pattern:
    count = frequency.get(word,0)
    frequency[word] = count + 1

frequency_list = frequency.keys()

for words in frequency_list:
    print(words, frequency[words])

with open(out_filename, "w") as fw:
  fw.write(headers)
  fw.write(words + ", " + str(frequency[words]) + "\n")

---

您应该迭代所有词频对，并将每个词频对写入单独的一行

with open(out_filename, "w") as fw:
  fw.write(headers)
  for word, freq in frequency.items():
      fw.write(word + ", " + str(freq) + "\n")