从文本文件中提取特定记录并保存到 Python 中的新文件

Question

I have a txt file which contain thousands of receipts info. There are two types:

• Regular receipts

• Summary receipts

I need to get all Summary receipts and it's contents only and itsand write them into a new file.

The following is what I've done so far, but what it does is just copying everything to a new file.

filtered = []
with open("sample.txt", "r+") as file: 
    for line in file:
        filtered.append(line.split(""" 
                    Company Name
                      A CITY         
                    Name of CITY              
                     Tin:00000     
                      #10000      
            N#00108235 Cashier ID#0000 
        - - - - - - - - - - - - - - - - - - - -
                Report(X-Report)         
        """))

    outputfile = open("output.txt","w") 
    for lines in filtered:
        outputfile.write(str(lines))

I'm quite new to python and tips or guidance is much appreciated. TIA

Answer 1

do you only need to seperate them according to the type? Simple solution as per your explaination is to read the contents of the file and find the word "SUMMARY OF CHARGES" in that file, if found then save the content to a new file. regex for anything with a word abc in it will be .*abc.* the code would be something like this if you have single file for single receipt.

import re
with open("sample.txt","r") as sfile:
   cont=sfile.read()
if (re.match(".*SUMMARY OF CHARGES.*",cont)):
   with open("outfile.txt","w") as outfile:
      outfile.write(cont)

To seperate the contents of individual receipts, you can use the regex groups. make the regex in such a way that it'll only keep a single receipt, then make a group (your_regex)* then iterate over that group to get all the matching receips.

Answer 2

First we can split the entire file into a list of recipe like this.

with open("sample.txt", "r+") as file: 
    receipts = file.read()

# We convert it to a list of receipts
receipts = receipts.split("- - - - -") #<=== This should be tweak to ensure that we split all receipt. You can also use "FROM THE DATE  PERMIT TO USE"

Then we filter hour list we something that is unique in recipe list.

my_filter = lambda receipt: "SUMMARY OF CHARGE" in receipt
summaries = list(filter(my_filter, receipts)) 

with open("out.txt", "a") as outfile:
    for summary in summaries:
        outfile.write(summary)