如何让我的代码从文本文件中显示一定数量的字符

Question

In my assignment i'm expected to look for a word and only return a set number of characters (which is 80, and 40 on each side surrounding the word), without the use of nltk or regex.

I've set my code up as so

open = open("a2.txt", 'r')
 file2read = open.readlines()
  name = 'word'
    for line in file2read:
        s2 = line.split ("\n", 1)
        if name in line:
           i = line.find(name)
           half = (80 - len(name) - 2) // 2
           left = line[i - half]
           right = line[i + len(word) + half]
           print(left + word + right)

but then my print out looks like this (updated screenshot) instead of the 80 character lines which i'm hoping to find.

Sorry if this is a really newbie error as i'm only 3 weeks into the program and i've been searching and can't seem to get the answer

Answer 1

Instead of doing readlines which might not be consistent due to differences in windows/Unix you can also read the entire text at once:

You don't need to separate it in lines:

with open('a2.txt', 'r') as file:
    a = file.read()
    name = 'word'
    if name in a:
       i = a.find(name)
       half = (80 - len(name) - 2) // 2
       left = a[i-half:i]
       right = a[i+len(name):i + len(name) + half]
       print(left + name + right)

This way you are reading the entire text at once. Finding your word and printing the necessary 80 characters. This is the output

ut. even know say trip tip sandwich. words describe it. meat eater, love it. b

If you want to make it work for all the words in the text. You will need to make a loop =) but that i'm sure you can figure it out by yourself!