IronBat IronBat - 1 year ago 93
Python Question

Stop Words from python

I have a text file where I am counting the sum of lines, sum of characters and sum of words. How can I clean the data by removing stop words such as (the, for, a) using string.replace()

I have the codes below as of now.

Ex. if the text file contains the line:

"The only words to count are Buttons and Shares for this text"

It should output:

1 Buttons
1 words
1 only
1 text

Although my code does not output the stop words that I have blacklisted but it also removes the stop words if its inside any other words. Below is what my code outputs.

1 Butns (this is a problem)
1 Shs (this is a problem)
1 words
1 only
1 text

Below is the code I have as of now.

# Open the input file
fname = open('2013_honda_accord.txt', 'r').read()

num_chars = len(fname)

num_lines = fname.count('\n')

fname = fname.lower() # convert the text to lower first

# Remove Stop words
blacklist = ["the", "to", "are", "and", "for", "this" ] # Blacklist of words to be filtered out
for word in blacklist:
fname = fname.replace(word, "")

# Removing special characters from the word count
get_alphabetical_characters = lambda word: "".join([char if char in 'abcdefghijklmnopqrstuvwxyz1234567890-' else '' for char in word])
words = list(map(get_alphabetical_characters, fname.split()))

d = {}
for w in words:
# if the word is repeated - start count
if w in d:
d[w] += 1
# if the word is only used once then give it a count of 1
d[w] = 1

# Add the sum of all the repeated words
num_words = sum(d[w] for w in d)

lst = [(d[w], w) for w in d]
# sort the list of words in alpha for the same count
# list word count from greatest to lowest (will also show the sort in reserve order Z-A)

# output the total number of characters
print('Your input file has characters = ' + str(num_chars))
# output the total number of lines
print('Your input file has num_lines = ' + str(num_lines))
# output the total number of words
print('Your input file has num_words = ' + str(num_words))

print('\n The 30 most frequent words are \n')

# print the number of words as a count from the text file with the sum of each word used within the text
i = 1
for count, word in lst[:10000]:
print('%2s. %4s %s' % (i, count, word))
i += 1


Answer Source

Assuming that you don't need punctuation for your analysis, you can do something like this -

punctuation_list = ['?',',','.'] # non exhaustive

for punctuation in punctuation_list:
   fname = fname.replace(punctuation, "")

blacklist = ["the", "to", "are", "and", "for", "this" ]  

for word in blacklist:
   fname = fname.replace(" "+word+" ", " ") #replace StopWord preceded by a space and followed by a space with a space