{"id":24592,"date":"2022-12-04T06:50:52","date_gmt":"2022-12-04T01:20:52","guid":{"rendered":"https:\/\/jassweb.com\/solved\/solved-python-script-for-reformatting-a-text-file-into-a-csv-using-python\/"},"modified":"2022-12-04T06:50:52","modified_gmt":"2022-12-04T01:20:52","slug":"solved-python-script-for-reformatting-a-text-file-into-a-csv-using-python","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-python-script-for-reformatting-a-text-file-into-a-csv-using-python\/","title":{"rendered":"[Solved] Python script for reformatting a text file into a csv using Python"},"content":{"rendered":"

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This could be done easily using a regular expression but I am guessing you do not wish to use that. <\/p>\n

Instead the problem can be solved by reading the file in a line at a time and deciding if the line starts with a number followed by a .<\/code>. If it does, start you start building up a list of lines until you find the next number.<\/p>\n

Using Python’s int()<\/code> function will attempt to convert a string into a number. The find('.')<\/code> function attempts to locate the end of the number.<\/p>\n

If the returned string is not a number, it causes a ValueError<\/code> exception to be raised. In this case, add the line to the list of lines.<\/p>\n

If there was a number, first write any existing entry to the csv<\/code> file, and then start a new entry.<\/p>\n

At the end, there will not be a final number line to trigger the next write, so add another call to write the final row to the csv.<\/p>\n

For example:<\/p>\n

import csv        \n\nwith open('text.txt') as f_input, open('output.csv', 'wb') as f_output:\n    csv_output = csv.writer(f_output)\n    entry = []\n\n    for line in f_input:\n        line = line.strip()    # Remove the trailing newline\n\n        if len(line):          # Does the line containing anything?\n            try:\n                number = int(line[:line.find('.')])\n\n                if len(entry):\n                    csv_output.writerow(entry)\n                entry = [number]\n            except ValueError:\n                entry.append(line)\n\n    csv_output.writerow(entry)\n<\/code><\/pre>\n
Python’s csv<\/code> library is used to take a list and automatically add the necessary commas between entries when writing to the csv output file. If an entry contains a comma, it will automatically add quotes.<\/p>\n<\/p><\/div>\n
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solved Python script for reformatting a text file into a csv using Python <\/p>\n","protected":false},"excerpt":{"rendered":"
[ad_1] This could be done easily using a regular expression but I am guessing you do not wish to use that. Instead the problem can be solved by reading the file in a line at a time and deciding if the line starts with a number followed by a .. If it does, start you … Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[320],"tags":[483,2256,349,362],"class_list":["post-24592","post","type-post","status-publish","format-standard","hentry","category-solved","tag-csv","tag-file-handling","tag-python","tag-string"],"yoast_head":"\n[Solved] Python script for reformatting a text file into a csv using Python - JassWeb<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/jassweb.com\/solved\/solved-python-script-for-reformatting-a-text-file-into-a-csv-using-python\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"[Solved] Python script for reformatting a text file into a csv using Python - JassWeb\" \/>\n<meta property=\"og:description\" content=\"[ad_1] This could be done easily using a regular expression but I am guessing you do not wish to use that. 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