[英]in Python, how can i write from a text file with each word being a different element?
[英]How can i write the name of text file before frequency of each word?
我如何在每个单词频率中写入文本文件名,以便它首先显示fileno,然后显示该文件中单词的频率。 例如:{like:['file1',2,'file2,'4']}这里是两个文件都包含的单词,我想在它们的频率之前写入file1和file2。 对于任何数量的文件,它应该是通用的。
这是我的代码
file_list = [open(file, 'r') for file in files]
num_files = len(file_list)
wordFreq = {}
for i, f in enumerate(file_list):
for line in f:
for word in line.lower().split():
if not word in wordFreq:
wordFreq[word] = [0 for _ in range(num_files)]
wordFreq[word][i] += 1
我知道我的代码不是很漂亮,也不完全是您想要的,但这是一个解决方案。 我更喜欢使用字典而不是像['file1',2,'file2,'4']
这样的列表结构
让我们定义2个文件作为示例:
FILE1.TXT:
this is an example
FILE2.TXT:
this is an example
but multi line example
解决方法如下:
from collections import Counter
filenames = ["file1.txt", "file2.txt"]
# First, find word frequencies in files
file_dict = {}
for filename in filenames:
with open(filename) as f:
text = f.read()
words = text.split()
cnt = Counter()
for word in words:
cnt[word] += 1
file_dict[filename] = dict(cnt)
print("file_dict: ", file_dict)
#Then, calculate frequencies in files for each word
word_dict = {}
for filename, words in file_dict.items():
for word, count in words.items():
if word not in word_dict.keys():
word_dict[word] = {filename: count}
else:
if filename not in word_dict[word].keys():
word_dict[word][filename] = count
else:
word_dict[word][filename] += count
print("word_dict: ", word_dict)
输出:
file_dict: {'file1.txt': {'this': 1, 'is': 1, 'an': 1, 'example': 1}, 'file2.txt': {'this': 1, 'is': 1, 'an': 1, 'example': 2, 'but': 1, 'multi': 1, 'line': 1}}
word_dict: {'this': {'file1.txt': 1, 'file2.txt': 1}, 'is': {'file1.txt': 1, 'file2.txt': 1}, 'an': {'file1.txt': 1, 'file2.txt': 1}, 'example': {'file1.txt': 1, 'file2.txt': 2}, 'but': {'file2.txt': 1}, 'multi': {'file2.txt': 1}, 'line': {'file2.txt': 1}}
这是collections.Counter
好用例; 我建议为每个文件做一个计数器。
from collections import Counter
def make_counter(filename):
cnt = Counter()
with open(filename) as f:
for line in f: # read line by line, is more performant for big files
cnt.update(line.split()) # split line by whitespaces and updated word counts
print(filename, cnt)
return cnt
该函数可用于每个文件,从而形成一个包含所有计数器的dict
:
filename_list = ['f1.txt', 'f2.txt', 'f3.txt']
counter_dict = { # this will hold a counter for each file
fn: make_counter(fn)
for fn in filename_list}
现在,可以使用一个set
来获取出现在文件中的所有不同单词:
all_words = set( # this will hold all different words that appear
word # in any of the files
for cnt in counter_dict.values()
for word in cnt.keys())
这些行将打印每个单词以及每个文件中单词的计数:
for word in sorted(all_words):
print(word)
for fn in filename_list:
print(' {}: {}'.format(fn, counter_dict[fn][word]))
显然,您可以根据自己的特定需求调整打印,但是这种方法应该可以为您提供所需的灵活性。
如果您宁愿有一个dict
,所有的单词都作为键,而它们的数量则作为值,则可以尝试如下操作:
all_words = {}
for fn, cnt in counter_dict.items():
for word, n in cnt.items():
all_words.setdefault(word, {}).setdefault(fn, 0)
all_words[word][fn] += 0
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