{"id":32800,"date":"2023-02-02T01:16:16","date_gmt":"2023-02-01T19:46:16","guid":{"rendered":"https:\/\/jassweb.com\/solved\/solved-delete-lines-from-text-file-python-closed\/"},"modified":"2023-02-02T01:16:16","modified_gmt":"2023-02-01T19:46:16","slug":"solved-delete-lines-from-text-file-python-closed","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-delete-lines-from-text-file-python-closed\/","title":{"rendered":"[Solved] Delete lines from text file – python [closed]"},"content":{"rendered":"

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This answer is assuredly overkill for your simple line selection problem, but it illustrates a nice property of Python: Often a very generalized pattern of behavior or processing can be very generally stated in a way that goes well beyond the original use case. And instead of creating a one-time tool, you can create very flexible, highly reusable meta-tools.<\/p>\n

So without further ado, a generator for returning only the lines of a file bounded by two terminal strings, and with a generalized preprocessing facility:<\/p>\n

import os\n\ndef bounded_lines(filepath, start=None, stop=None,\n                  preprocess = lambda l: l[:-1]):\n    \"\"\"\n    Generator that returns lines from a given file.\n    If start is specifed, emits no lines until the\n    start line is seen. If stop is specified, stops\n    emitting lines after the stop line is seen.\n    (The start and stop lines are themselves emitted.)\n    Each line can be pre-processed before comparison\n    or yielding. By default, this is just to strip the\n    final character (the newline or \\n) off. But you\n    can specify arbitrary transformations, such as\n    stripping spaces off the string, folding its case,\n    or just whatever.\n    \"\"\"\n    preprocess = lambda x: x if preprocess is None else preprocess\n    filepath = os.path.expanduser(filepath)\n    with open(filepath) as f:\n        # find start indicator, yield it\n        for rawline in f:\n            line = preprocess(rawline)\n            if line == start:\n                yield line\n                break\n        # yield lines until stop indicator found, yield\n        # it and stop\n        for rawline in f:\n            line = preprocess(rawline)\n            yield line\n            if line == stop:\n                raise StopIteration\n\n\nfor l in bounded_lines('test.txt', 'DOCHELLO', 'SIRFORHE'):\n    print l\n<\/code><\/pre>\n<\/p><\/div>\n
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solved Delete lines from text file – python [closed] <\/p>\n","protected":false},"excerpt":{"rendered":"
[ad_1] This answer is assuredly overkill for your simple line selection problem, but it illustrates a nice property of Python: Often a very generalized pattern of behavior or processing can be very generally stated in a way that goes well beyond the original use case. And instead of creating a one-time tool, you can create … 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":[349],"class_list":["post-32800","post","type-post","status-publish","format-standard","hentry","category-solved","tag-python"],"yoast_head":"\n[Solved] Delete lines from text file - python [closed] - 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-delete-lines-from-text-file-python-closed\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"[Solved] Delete lines from text file - python [closed] - JassWeb\" \/>\n<meta property=\"og:description\" content=\"[ad_1] This answer is assuredly overkill for your simple line selection problem, but it illustrates a nice property of Python: Often a very generalized pattern of behavior or processing can be very generally stated in a way that goes well beyond the original use case. 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