python - 改变Python中的字典/键

Question

我已经在 Python 中运行了下面的代码，以从文本文件中生成单词列表及其计数。我该如何从“Frequency_list”变量中过滤掉计数为 1 的单词？

另外，如何将底部的打印语句循环导出到CSV

预先感谢您提供的任何帮助。

import re
import string
frequency = {}
document_text = open('Words.txt', '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])

Answer 1

要过滤掉单词，另一种方法是:

frequency = dict(filter(lambda (k,v): v>1, frequency.items())) 

要将底部的打印语句循环导出到 CSV，您可以这样做:

import csv    
frequency_list = ['word1','word2','word3']  # example

with open('output.csv','w') as csvfile:
    writer = csv.writer(csvfile, delimiter=",")
    writer.writerow(frequency_list)

这将生成一个“output.csv”文件，其中一行包含频率列表中的单词。

要为每个单词获取一行，请尝试以下操作:

with open('output.csv','w') as csvfile:
    writer = csv.writer(csvfile, delimiter=",")
    writer.writerows([i.strip() for i in l.split(',')] for l in frequency_list)

Update

要获取带有计数器的 csv，请保留您的初始字典并执行以下操作:

frequency = {"one":1,"two":2,"three":3} #example
with open('output.csv', 'w') as csvfile:
    writer = csv.writer(csvfile)
    for key, value in frequency.items():
       writer.writerow([key, value])